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Sigma 950 Flow Meter - Environmental Data Service`s

1. 1 Base Board 3 LCD Board 5 CPU Board 7 Opening the Front Cover 2 J4 Connector 4 J6 Connector 6 Memory Batteries 9 2 3 Re Installing the Front Panel Always follow the procedure below when re installing the front panel Improper front panel installation may result in damage to the instrument 1 78 Hand tighten the screws in the sequence shown in Figure 18 on page 79 until the head of each screw makes contact with the front panel Tighten screws in sequence shown in Figure 18 on page 79 to 5 in Ib 0 565 Newton meter Repeat the tightening procedure in the same sequence to 10 in Ib 1 125 Newton meters Maintenance Figure 18 Screw Tightening Sequence SIGMA 950 12 00 AM 21 APR 93 aN DISPLAY DATA SETUP OPTIONS STATUS INTERNAL HUMIDITY REPLACE DESICCANT WHEN PINK TOTAL FLOW 9 3 Circuit Board Identification Note Removal and handling of the circuit boards used in the 950 Flow Meter requires knowledge of ESD Electrostatic Discharge precautions and the CMOS circuit components used in the meter Static electricity can damage the CMOS components of the meter when the boards are unplugged and removed from the case Precautions must be taken to assure a static free work area prior to handling the circuit boards The 950 Flow Meter contains two main circuit boards the Base Board and the CPU Board The CPU board is located on
2. Level 21 957 in Flow 0 57 mgd pH 6 2 Temp 73 F Rainfall 12 Total X 1000 31233 gal Power Supply 15 8 Volts Bubbler Ultrasonic Submerged Sensor 89 Program Flow Charts Figure 23 Setup Flow Chart SIGMA 950 Flow Meter SETUP Flowchart Displays all program items All Items no changes allowed Steps you through each program item All Items same items as Modify Selected Items below GPS or GPM or GPH or LPS or LPM or LPH or Modify Flow Units select MGD or AFD or CFS or CFM or CFH or CFD or Selected CMS or CMM or CMH or CMD Items or Level Units select FT or IN or M or CM or Area Velocity select Manning Equation Device None Level Only Weir Flume or Nozzle Power Equation Head vs Flow select Enable or Disable Program Lock or Sampler n Select Flow select Enable or Disable change interval and Flow Units Site I D select Enter Site I D or Total Blow select AF or CF or GAL or LTR or M Units or Velocity select Upstream normal or Downstream or Always Positive Direction or Velocity Units select fps or m s or Enter Velocity Enter Velocity Velocity Cutoff Hselecti Cutoff Value accept Default Value 90 Select a Channel amp Display a Graph or Table of Logged Values for that Channel Date Time amp Value Program Flow Charts Figure 24 Options F
3. noie eren eren dee eb beeen ec bae he 42 6 3 3 Submerged Area Velocity Sensor Programming ssseeeene 44 6 3 4 Submerged Area Velocity Sensor Calibration ssssssenee 44 6 4 Low Profile Velocity Only SenSOfs causes sctausseetoctncceeaiversdi annie seeped sc inanuia Mita E taec Deed stadi det rae 45 6 4 1 Low Profile Velocity Only Low Profile Sensor Connection eeseeeseeesss 45 6 4 2 Low Profile Velocity Only Sensor Programming sesseeen 45 6 4 3 Low Profile Velocity Only Sensor Calibration seen 45 Table of Contents 6 5 Submerged Depth Only SENSOR ies lassie oe iai tees cmd ee tune eet ugo ert aede ven fec ec dump 46 6 5 1 Submerged Depth Only Sensor Connection eesessseeeenn 46 6 5 2 Submerged Depth Only Sensor Programming eeeeeeenn 46 6 5 3 Submerged Depth Only Sensor Calibration eee 46 6 0 10 3 6 PR PKT eee ee Pe ern ne one eee Te ae 48 6 6 7 B bbler CONMECHONS uscire ie ode Rn cecus sis sees e x o Re DEL dran es we taie t cases 48 6 6 1 1 Meter End Cable Terminations eee eee nemen torte nne eren dann 49 6 6 1 2 Routing the Bubbler big notre ot dues I ERU AE Uu AERE AR GLO Uo spe e o Stn etd 49 6 6 2 B bbler Installations sni ett ee edet nee cad oceans E e eg eet d anda abe ead 50 6 6 2 1 Installatio
4. Flume size in inches 4 6 8 10 12 15 18 21 24 27 30 36 42 48 60 or 72 in Table 9 Other Primary Devices Device or Equation Level vs Area Table two level vs area tables are provided Description Enter up to two tables of up to 99 user defined level vs area points Level 0 999 9 in ft in m or cm Area 1 99999 99 in ft2 in 2 m2 or cm Nozzle Enter nozzle diameter Step 5 Program Lock Program Lock provides a protective passcode to keep unauthorized personnel from tampering with the keyboard and or prevent access via RS232 or modem When enabled a screen will require a password to be entered The Program Lock password factory is set as 9500 and cannot be changed 5 A Next the flow meter will display the Program Lock screen 5 B Enable or Disable the program lock using the CHANGE CHOICE soft key Press ACCEPT to continue to Sampler Pacing Step 6 Sampler Pacing 32 6 A Next the flow meter will display the Sampler Pacing screen 6 B Enable Sampler Pacing using the CHANGE CHOICE soft key Refer to Table 10 for flow unit choices for sampler pacing Basic Programming Setup 6 C Press ACCEPT to continue with Site ID 11 00 AM 21 APR 01 SAMPLER PACING CHANGE ACCEPT UNITS SAMPLER PACING CLEAR 500 gal ENTRY CANCEL USE NUMERIC KEYPAD Table 10 Flow Unit Choices Abbreviation Volume gal gallons Itr liters m3 cubic me
5. Enter the elevation above sea level for the specific location Enter the membrane thickness The operation of the 950 Flow Meter will be affected by the choice of membrane thickness for the oxygen sensor For general purpose applications the 1 Mil membrane is standard This membrane allows measurements in the 0 to 20 ppm range of dissolved oxygen and provides the best general purpose trade off between response time and durability The 2 Mil membrane can be used to measure up to 40 ppm of dissolved oxygen Its increased thickness slows the response time of the sensor but this membrane has increased resistance to cuts and tears For this reason it is recommended for use in wastewater aeration basins where solids in the water are in rapid motion Enter the chlorinity salinity of the flow stream typical wastewater is zero sea water is higher Place the D O probe in open air and press any key The 950 Flow Meter will wait for the reading to stabilize before storing the calibration value The screen will automatically return to the calibration menu Calibrating the D O Temperature 1 2 3 Place the probe and the thermometer in a liquid Wait for the temperature reading to stabilize approximately 30 minutes Enter the actual temperature of the liquid 57 Optional Device Installation 7 5 Conductivity Probe 7 5 4 Conductivity Probe Connection The pre amp P N 3369 or 3212 is required Plug the probe into the pre am
6. Maintenance 9 4 2 Working with Wiring Connectors All inter connect wiring plugs and receptacles are mechanically polarized to assist in proper insertion Always note where a connector belongs and what orientation it was in prior to removal This will assure that you get it back in the right place during reassembly Locations and descriptions of each fuse and connector on the Base Board and CPU board are shown in Figure 19 and Figure 20 9 5 Replacing the Internal Desiccant Module The Internal Desiccant Module P N 787 consists of a moisture absorbing material inside a poly bag The module should be replaced if the Internal Case Humidity Indicator on the front panel turns pink To replace the desiccant module proceed as follows 1 Remove the screw holding the desiccant door in place and remove the door Figure 21 2 Slide out the old desiccant module and slide in a fresh one 3 Reattach the desiccant door The desiccant module cannot be recharged by heating Do not attempt to bake the desiccant module in an oven to remove the moisture because this could be a fire hazard Figure 21 Replacing Internal Desiccant Module R OY 1 Internal Module P N 787 2 Remove desiccant access screw and door 9 6 Replacing the Internal Case Humidity Indicator Disc 82 After replacing the desiccant module and re sealing the case the Internal Case Humidity Indicator Disc P N 2660 will return to its
7. Section 4 Controller Installation DANGER Some of the following manual sections contain information in the form of warnings cautions and notes that require special attention Read and follow these instructions carefully to avoid personal injury and damage to the instrument Only personnel qualified to do so should conduct the installation maintenance tasks described in this portion of the manual DANGER Certains des chapitres suivants de ce mode d emploi contiennent des informations sous la forme d avertissements messages de prudence et notes qui demandent une attention particuli re Lire et suivre ces instructions attentivement pour viter les risques de blessures des personnes et de d t rioration de l appareil Les t ches d installation et d entretien d crites dans cette partie du mode d emploi doivent tre seulement effectu es par le personnel qualifi pour le faire PELIGRO Algunos de los cap tulos del manual que presentamos contienen informaci n muy importante en forma de alertas notas y precauciones a tomar Lea y siga cuidadosamente estas instrucciones a fin de evitar accidentes personales y dafios al instrumento Las tareas de instalaci n y mantenimiento descritas en la presente secci n deber n ser efectuadas nicamente por personas debidamente cualificadas GEFAHR Einige der folgenden Abschnitte dieses Handbuchs enthalten Informationen in Form von Warnungen Vorsichtsmafinahmen oder Anmerkungen die beso
8. 147 Engineering Drawings 950 Flow Meter Area Velocity 2 of 2 8915 Jj Wi 3498 Orient key down SE 229 4 2859 148 Engineering Drawings 950 Flow Meter Bubbler Assembly 149 950 Flow Meter Optiflow Assembly Engineering Drawings LOZE 81 S660 z 698z 098z Z est p LSZ aS 150 Engineering Drawings 950 Flow Meter Bubbler Final Assembly SE 340 4 151 Engineering Drawings 950 Flow Meter Base Assembly f AS foe SGo9c s Cy pst 9392 f f y AS 152
9. 6 Select Rainfall Units in or cm Press ACCEPT to continue Select another channel to configure press RETURN to back up one step or press the MAIN MENU function key to return to the Main Menu 53 Optional Device Installation 7 2 pH Probe 7 2 1 pH Probe Connection Table 17 pH Connector Pin Assignments Pin Signal Description 5 VDC ground reference pH ORP 5 VDC nmol olo gt RTD The pH probe consists of five wires three for the pH probe and two for the temperature probe Since the pH probe reading needs to compensate for temperature variation there is a temperature probe built into every pH probe 1 Attach the clear wire to either screw on the terminal strip labeled GLASS 2 Attach the black wire on the shield of the cable to the REF screw on the other terminal strip 3 Attach the red wire to the GND screw on the terminal strip 4 Attach the green and yellow wires to the screws labeled RTD Resistance Temperature Detector Note The green and yellow wires can be attached to either one of the RTD terminal screws because there is no polarity present 7 2 2 pH Probe Programming 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt DATALOG 2 Highlight Select Inputs using the UP and DOWN keys then press SELECT 3 Highlight pH using the UP and DOWN keys then press SELECT 4 Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT 5 Ent
10. Battery is dead Try using an ac power supply or a different battery Gel or Nickel Cadmium battery has been submerged and internal corrosion has occurred Incorrect battery usage Replace the battery pack Use manufacturer battery Short Battery Life Voltage range is insufficient Ensure a gel cell or nickel cadmium voltage is in the 12 6 to 13 4 volts range when fully charged Battery power is draining to quickly Fully charge the battery and let it sit for an hour before checking the voltage Replace the battery if the voltage of the battery drops below 12 to 12 5 VDC within an hour Modem is operating Check to see if the unit is using a modem Flow Meters with a modem should always be on ac power or scheduled when using the cell option Low Main Battery Battery power is running low Change battery Memory Battery Internal memory battery needs to be changed Replace the two c cells inside the unit Low Slate Memory Free slate memory is less than 20 RAM memory is almost full and will stop recording soon Download data from unit halt and restart the program or download data halt and change data to wrap mode Slate Memory Full No more slate memory Unit is in slate memory mode and cannot log any more data Download data and restart the program or download data then change the memory mode Program Complete The program has completed and no more
11. Hach Company 2009 All rights reserved Printed in the U S A D Catalog Number 3314 Sigma 950 Flow Meter USER MANUAL August 2009 Edition 7 Table of Contents Section 1 Safety Precautions 0 cee cccenecee cece cere ceeeceeeeaeceeeceeeaeseaecseeeaesaeeaeeeaeseaseieseaeeeaeens 5 121 Use Of Mazard Information eee tec aeos cern Paste tot Siegel dues Mend eet Sauda ate slates Weng Man Qro oe atn 5 1 1 1 Precautionary babels ertet net re td eere kinds gita deben 5 T2 Hazardous LOCAUONS netter iade eo dine teo dtr erp ote ro Mage ad ect ademe orsa see A 6 1 3 Confined Space Enlry ere viens Gre RUE Ee OR RE CH Rx R pE sah RSS SEL ERI RARE E Edu FR PER E dobowa 6 1 4 FCC Requirements 5 5 orbe D D neat La dete e a d t pee DR donec 7 1 5 Service Requirements sss eterne nhe n herren EEE EEE rene ne enne n renes 8 Section 2 Specifications ona p ial ver d RERO a HERR A NER KE RR REB AER M LEER REN ER ANE N YR ud 9 2 1 Factory Installed Options ttd ete e iuo at Cete oe pense a tende ea ei oboe cu tee Meda 10 Section 3 Introduction corem ates eati dde s 17 3 1 Measurement Capabilities Asiatiske a a a a a a a a a ia a aaia 17 3 2 Front Panel Features and Gonlrols s esito ct bees RITE erf ha eB ORUM aea SEE HO ale n RR inus 17 3 2 1 PowerndicatorLiglio uie booa roter aai ducet ipe tod oca dea is cce Been ed 19 Section 4 Controller Installation sssssssssseeee 21 4
12. confined space entry 1 4 FCC Requirements 1 The Federal Communications Commission FCC has established Rules which permit this device to be directly connected to the telephone network Standardized jacks are used for these connections This equipment should not be used on party lines or coin lines 2 Ifthis device is malfunctioning it may also be causing harm to the telephone network this device should be disconnected until the source of the problem can be determined and until repair has been made If this is not done the telephone company may temporarily disconnect service 3 The telephone company may make changes in its technical operations and procedures if such changes affect the compatibility or use of this device the telephone company is required to give adequate notice of the changes 4 Ifthe telephone company requests information on what equipment is connected to their lines inform them of a The telephone number that this unit is connected to b Theringer equivalence number 1 4B c The USOC jack required RJ11C and d The FCC Registration Number Items b and d are indicated on the label The ringer equivalence number REN is used to determine how many devices can be connected to your telephone line In most areas the sum of the RENSs of all devices on any one line should not exceed five If too many devices are attached they may not ring properly Equipment Attachment Limitations Notice The Canad
13. longer to take a valid velocity reading of the flow stream To stay awake means that the meter has gone from a powered down idle state drawing only 1 mA to being fully powered up in order to operate the circuitry involved in recording a reading Normally the unit will power up for four seconds or less to take a reading Higher velocities cause the meter to stay on a few seconds longer before determining that the velocity reading is valid Essentially the meter may actually stay awake twice as long per recording interval This combined overall awake time can decrease battery life Improper Installation of Velocity Probes Any velocity probe that is installed incorrectly will cause the meter to process longer to determine a valid velocity The probes must be mounted level and pointed straight or parallel in the flow stream If possible locate the probe in non turbulent sites Improper Installation of Ultrasonic Probes Mount ultrasonic probes firmly and parallel with the flow stream surface If the probe is mounted at an angle to the flow stream the meter will increase the gain on the signal and 135 Batteries and Chargers 136 wait longer for a valid ultrasonic depth measurement This will also equate to decreased battery life Options The following options will cause excessive current draw e Modem if left enabled e Alarm Relays e 4to20mA outputs e Analog Channels If using 12 VDC internal supply Recording Chan
14. press the RUN key Select either resume to previously running program and retain all logged data or Start From Beginning and clear all logged data Basic Programming Setup Status Description Program is Running Data Logging 4 20 mA outputs sampler control and alarm checking are active Program is Halted Logging stops until the program is restarted It continues with the last logged value when restarted 4 20 mA outputs remain unchanged Sampler control is disabled Alarm checking is disabled Program is Complete or Ready to Start No data logging 4 20 mA outputs stay at last value No sampler interface No alarm checking Program Complete A logger is off or lost power for longer than 3 hours or datalogging memory is full see Data Log on page 99 35 Basic Programming Setup 36 Section 6 Sensor Installation An individual Sigma 950 flow meter may have one or more of the following sensors e Downlooking Ultrasonic Sensor Submerged Pressure e Submerged Pressure Sensor Area Velocity Sensor e n Pipe Ultrasonic Sensor e Velocity Only Low Profile e Bubbler Sensor e AV Bubbler 6 1 Downlooking Ultrasonic Depth Sensor 6 1 1 Downlooking Ultrasonic Depth Sensor Connection Note Use a bare leads sensor and junction box P N 3658 for conduit installation The Sigma 950 Flow Meter uses a 50 kHz or 75 kHz Downlooking Ultrasonic Depth Sensor Th
15. 30 ft Range Minimum distance from sensor to liquid 38 1 cm 15 in Span 0 to 8 84 m 0 to 29 ft Sensor Certification USA Class Zone I Groups A B C D Canada Class Division Groups A B C D Class II Division Groups E F G Ambient Operating Temperature 18 to 60 C 0 to 140 F Temperature Error 0 000047 ft F maximum error within compensated temperature range per degree of change Resolution 0 0011 ft Material PVC housing with Buna N acoustic window Cable 4 conductor with integral stainless steel support cable Cable Length 7 6 m 25 ft standard custom lengths are available Crystal Specification 50 kHz 11 5 included beam angle Dimensions transducer only 9 5 cm H x 7 cm D 3 75 in H x 2 75 in D Weight 0 7 kg 1 5 Ibs 12 Specifications Downlooking Ultrasonic Depth Sensor 75 kHz Accuracy 1 to 10 ft 0 01 ft 0 003 m at 22 C 72 F still air 40 70 relative humidity Maximum distance from sensor to liquid 3 3 m 10 8 ft Range Minimum distance from sensor to liquid 23 cm 9 in Span 0 to 4 57 m 0 to 15 ft Sensor Certification Ambient Operating Temperature Temperature Error USA Class Zone lI Groups A B C D Canada Class Division Groups A B C D Class ll Division Groups E F G 18 to 60 C 0 to 140 F 0 000047 ft F maximum error within compensated temp
16. Level 1 Float 32 2 00 06 40007 40008 Velocity 1 Float 32 2 00 08 40009 40010 Channel 1 Float 32 2 00 0A 40011 40012 Channel 2 Float 32 2 00 0C 40013 40014 Channel 3 Float 32 2 00 OE 40015 40016 Channel 4 D O Float 32 2 00 10 40017 40018 Channel 5 D O Temp Float 32 2 00 12 40019 40020 Channel 6 Conductivity Float 32 2 00 14 40021 40022 Channel 7 Cond Temp Float 32 2 00 16 40023 40024 Flow 1 Float 32 2 00 20 40033 40034 Power Float 32 2 00 26 40039 40040 Table 42 Channels Units of Measure Read Holding Register Addresses Name Type Size bits of Registers start TRS Start SR Registers Temperature Integer 16 1 00 31 40050 Rainfall Integer 16 1 00 32 40051 pH or ORP Integer 16 00 33 40052 Level 1 Integer 16 1 00 34 40053 Velocity 1 Integer 16 00 35 40054 Channel 1 Integer 16 1 00 36 40055 Channel 2 Integer 16 00 37 40056 Channel 3 Integer 16 1 00 38 40057 Channel 4 D O Integer 16 00 39 40058 Channel 5 D O Temp Integer 16 1 00 3A 40059 Channel 6 Conductivity Integer 16 00 3B 40060 Channel 7 Cond Temp Integer 16 1 00 3C 40061 Flow 1 Integer 16 00 41 40066 1 The addresses shown above return a code that represents the appropriate unit of measure Table 43 Flow Totalizer Read Holding Register Addresses Name Type Size bits of Registers start oo start add Registers Total Flow 1 Float 32 2 00 4A 40075 40076 Total Flow Units Integer 16 00 50 40081 Total Flow Multiplier Float 32 2 00 52 40083 40084
17. Press CHANGE CHOICE to select the pH for the second buffer solution then press ACCEPT to continue A pH Calibration Failed Gain And Or Offset Out of Range Try Again error message will be displayed if the pH probe is damaged cannot be calibrated or if the buffer solutions do not fall within an acceptable range Make an attempt at reading the second buffer solution after pressing a key If this fails it is likely that you have a poor pH probe or poor buffer solutions Try a new set of buffer solutions If that fails try a different pH probe 7 3 ORP Probe 7 3 1 ORP Probe Connection Table 18 ORP Connector Pin Assignments Pin Signal Description 5 VDC ground reference pH ORP 5 VDC RTD Note There is no temperature sensor on the ORP sensor The ORP probe consists of three wires a clear wire a black wire and a red wire The pre amp required interface is a 6 pin connector on one end and a junction box with terminal strips on the other end P N 2078 1 Attach the clear wire to either screw on the terminal strip labeled GLASS 2 Attach the black wire to the REF screw on the other terminal strip 3 Attach the red wire to the GND screw on the terminal strip 7 3 2 ORP Programming 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS DATALOG 2 Highlight Select Inputs using the UP and DOWN soft keys and then press SELECT to continue Highlight ORP using the UP and DOWN soft keys the
18. Programming Features Table 39 Sampling Triggers Sampling Trigger Settings Analog Input Channel 1 High and or Low condition deadband Analog Input Channel 2 High and or Low condition deadband Analog Input Channel 3 High and or Low condition deadband Analog Input Channel 4 High and or Low condition deadband Analog Input Channel 5 High and or Low condition deadband Analog Input Channel 6 High and or Low condition deadband Analog Input Channel 7 High and or Low condition deadband To enable Set Point Sampling 1 From the Main Menu select OPTIONS ADVANCED OPTIONS gt SETPOINT SAMPLING 2 Highlight SETPOINT SAMPLING using the UP and DOWN soft keys then press SELECT 3 Highlight the desired sampling trigger see Table 39 then press SELECT 4 Highlight either SAMPLE ON HIGH CONDITION or SAMPLE ON LOW CONDITION 5 Press CHANGE CHOICE to enable or disable the sampling trigger for this condition Note You must log rainfall to use set point sampling on a rainfall condition likewise you must log flow in order to implement set point sampling on a flow rate of change If you forget you are reminded when the program begins 6 Enter the desired high or low trigger point using the numeric keypad then press ACCEPT 7 Enter a deadband value see Setting the Deadband on page 98 or if programming for Flow Rate Of Change or Rainfall enter a time interval within which the flow or rainfall change must take pl
19. Rain Trigger Rain Time Limit Level Trigger Check one Head Vs Flow Worksheet Level Vs Area Worksheet velocity units only Head Level units Flow Area units 116 SCADA Modbus System Guidelines Appendix E SCADA Modbus System Guidelines E 1 Introduction to SCADA Modbus Communications Use this section as a guide when using the Modbus ASCII protocol to communicate directly with the 950 Flow Meter through an RS232 or modem connection This guide assumes that the user has a working knowledge of Supervisory Control and Data Acquisition SCADA its components and the different topologies used to construct the communications network Because a basic understanding of the Modbus ASCII protocol is necessary a description of key pieces of the protocol will be described This section will guide you through the setup process by describing key points that need to be addressed for successful communication This section will not outline specific implementation details of any particular Man Machine Interface MMI or controller although examples may reference certain manufacturers for illustrative purposes The description of the Modbus ASCII protocol is provided for reference only and is not intended as a tutorial The scope of this section is limited to the description of Modbus ASCII as it pertains to the 950 Flow Meter Modbus an open protocol determine
20. clearance for removing the power supply while the unit is installed Connect the flow meter with four 74 20 screws provided using the four threaded inserts on the back of the case See Figure 2 Controller Installation Figure 2 Wall Mounting Bracket 4 3 2 Suspension Harness Installation Optional Use the optional Suspension Harness P N 2889 to suspend the flow meter in a manhole or similar site The suspension harness has two captive 74 20 S S mounting screws attached to the top of two threaded inserts on the back of the flow meter A stainless steel clip is also provided on top of the harness for mounting to an Instrument Support Bracket P N 5713000 or similar support When suspending the flow meter the Suspension Harness utilizes only the top two threaded mounting inserts leaving the bottom two free Do not use the bottom inserts for suspending any additional equipment The inserts are designed to support only the weight of a 950 Flow Meter and will not adequately support additional weight 4 3 3 Manhole Rung Hanger Optional The Manhole Rung Hanger P N 3533 is a convenient way to hang the 950 Flow Meter from a manhole ladder rung Constructed of 304 Stainless Steel it makes a temporary mounting as secure as a permanent one The Manhole Rung Hanger has two captive thumb screws for securing the bracket to the top two threaded inserts on the 950 Flow Meter The Manhole Rung Hanger also has a spring loaded handle t
21. gpm gph Ips lpm Iph mgd afd cfs cfm cfh cfd cms cmm cmh cmd 2 Select LEVEL unit of measure cm m in ft Select a PRIMARY DEVICE Flume Type Size Weir Type Size Nozzle Type Size Manning Formula Slope Roughness Pipe Diameter Power Equation K4 n4 j K N3 Head vs Flow Enable PROGRAM LOCK password Y N Password is always 9500 Enable SAMPLER PACING Y N Flow interval Flow unit of measure Enter a SITE IDENTIFICATION Enter unit of measure for TOTAL FLOW acre feet cubic feet gallons liters cubic meters 113 Programming Worksheet Applies to velocity models only 8 Enter the VELOCITY DIRECTION Upstream normal Downstream or Always Positive 9 Enter the VELOCITY UNITS ft s or m s 10 Enter the VELOCITY CUTOFF 11 Cutoff value OPTIONS MENU From the Main Menu select OPTIONS 1 Set Time amp Date 2 Level Sensor Ultrasonic or Submerged Sensor ADVANCED OPTIONS MENU From the Main Menu select OPTIONS gt ADVANCED OPTIONS 1 Setup 4 20 ma Outputs if desired 2 Setup ALARMS if desired Default Value Alarm Name High Trigger Low Trigger Deadband Time Interval Relay Set Low Mem Battery Level Flow Flow Rate of Change pH Temperature Rainfall Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Cha
22. you configured the Modbus server and or MMI to interpret the Channel Have you configured the Modbus server and or MMI to interpret the Units Of Measure as teger Values Configure the Modbus server and or MMI to interpret the values being returned for Units Of Measure as 16 bit integer values If you re not sure how to do this contact the server or MMI manufacturer for Yes Yes Data being returned as floating point values No Y assistance v Configure the Modbus server and or MMI to interpret the channel data being returned as 32 bit floating point values If you re not sure how to do this contact the server or MMI manufacturer for assistance Make a note of the Modbus message and then call Tech Support to have the Modbus Response Message validated Use either a protocol analyzer or a communications diagnostic program running on a PC to intercept and verify the Modbus response message from the 950 131 SCADA Modbus System Guidelines 132 Appendix F Batteries and Chargers ATTENTION Pour pr server la s curit de l utilisateur et viter d endommager l quipement rechargez exclusivement les accumulateurs avec les chargeurs Hach Company sp cifi s CAUTION To ensure user safety and prevent damage to equipment use only the specified Hach Company battery chargers to recharge batteries F 1 Le
23. 1 From the Main Menu select OPTIONS gt ADVANCED OPTION COMMUNICATIONS SETUP 2 Highlight Modem Setup using the UP and DOWN soft keys Press ACCEPT 11 00 AM 21 APR 01 COMUNICATION SETUP SELECT MODEM SETUP RS232 SETUP RETURN 63 Communications Setup 3 Enable modem power by pressing the CHANGE CHOICE soft key Modem power is turned off when not in use to conserve battery power 11 00 AM 21 APR 01 MODEM SETUP CHANGE ACCEPT CHOICE MODEM POWER ENABLED CANCEL CHOICES ENABLED DISABLED 4 Select either pulse or tone dialing modes This will depend on the type of phone service selected for the site phone line Press ACCEPT 11 00 AM 21 APR 01 MODEM SETUP CHANGE ACCEPT CHOICE DIAL METHOD TONE CANCEL CHOICES TONE PULSE 5 Enter a phone number using the numeric keypad This phone number is used by the modem when it sends an alarm report to a personal computer running Hach s data management software 11 00 AM 21 APR 01 MODEM SETUP ACCEPT PHONE NUMBER 555 5555 CANCEL USE NUMERIC KEYPAD 8 2 3 Modem Options 8 2 3 1 Pager Option The 950 Flow Meter can be setup to call up to 3 individual pagers or a remote computer when a given alarm condition has been met As indicated in the upper right hand corner of the display menu which follows the pager setup is an extension of the Modem Setup menus see above To have the 950 Flow Meter call a pager
24. 1 Unpacking the Instrumerit uiii Leer Ela o xD Lade Lebe e E e e Rande dene 22 4 2 CHOOSING the Proper SII eere e eate ripe Ee preti hte poer eub ee he ade Saad ee deve 22 4 3 Mounting ODLUOFPS satt Steet taste add cates is isto taedas dad tois tete eue i oua dd eed tus 22 4 3 1 Wall Mountng Optional phi petra eror teca eee obrui ie tsb te tree gue 22 4 3 2 Suspension Harness Installation Optional seen 23 4 3 3 Manhole Rung Hanger Optional 002 cccccccsesesccesecceeeeeeeeeeneeeenee eene nite mek eer nnn nins 23 4 4 Installing the Power SUpply cuida rrt eolit to dirette nid eoe reip Rete aaa 24 4 5 Interface Connector Descriptions eeesessssessssssessssssess seen nnns 25 40 T4 VG OMS CU DIIS se ecoute osten opas UOS Lot unie rau cott aan ae Mest dG Sam Seana eases 25 4 7 Sampler er iRERR inven SPORE NR ERN E E RR PE ERR SERRA e RE Dr e e rh o ROG WT er ER LR eas 26 4 71 Sampler Connection S rsr ert e eerta ce Dunt eq e ego te Pot ea oa QE E e s AE Td 26 4 7 2 Sampler Prograrmiimirig eerie ge see EE DRE Ue ER Pe RERO T RE ORBIS UBER CR X RRR RAD ERIS 26 4 8 Installation Requirements for CE Marked 950 Flow Meter Models eeeeeeeeees 27 Section 5 Basic Programming Setup sssssssssseeeeeeeeennns 29 5 1 Initial Power Up of Meter eeseeessesssssssssssssssssseseee nennen nnne nnn rn rnnt ner r n rre nnn nnne
25. 33 Basic Programming Setup 9 E Read the Velocity cutoff warning on the screen Press any key to continue 9 F Enter the Velocity Cutoff using the numeric keypad Press ACCEPT to continue 9 G Enter the Velocity Default using the numeric keypad Press ACCEPT to end the basic programming setup Note Velocity Cutoffs are used at sites where low velocities and frequent low particulate concentrations occur if velocity cannot be measured Example 1 Velocity Cutoff 0 20 ft s Velocity Default 0 ft s If the velocity falls below 0 20 ft s the meter will store a value of 0 ft s until the velocity increases above 0 20 ft s Example 2 Velocity Cutoff 0 20 ft s Velocity Default 0 20 ft s If the velocity falls below 0 20 ft s the meter will store a value of 0 20 ft s until the velocity increases above 0 20 ft s 5 3 Starting and Stopping Programs 34 Note When selecting START FROM BEGINNING all logged data will be cleared from memory When saving the logged data make sure the data is downloaded to a DTU or personal computer If a program is complete the logger can only be restarted from the beginning and will clear all logged data When basic programming setup is completed run or execute the program selections Press the RUN STOP key to run a program resume a currently halted program or stop a program If a program has been halted and no changes to the program settings were made while it was stopped
26. 59 degrees C 32 to 138 degrees F Temperature Error 0 0003 ft F maximum error within compensated temperature range per degree of change Air Intakes Bubble source and reference port desiccant protected Fittings provided for remote intakes Filter 10 micron on bubble source intake Line Purge Bubble line is high pressure purged at programmed intervals or in manual mode on demand Line Size 0 32 cm 1 8 in ID standard Line Lengths 160 m 500 ft maximum 11 Specifications Submerged Depth Only Sensor Accuracy 0 1 full scale Non linearity and dysteresis Range Ambient Operating Temperature Temperature Error 2 5 psi 0 01 to 1 75 m 0 04 to 5 75 ft 0 to 71 C 32 to 160 F 2 5 psi 0 04 to 5 75 ft 0 006 ft F maximum error within compensated temperature range per degree of change Air Intake Atmospheric pressure reference is desiccant protected Material 316 stainless steel body with titanium diaphragm Cable 4 conductor polyurethane sensor cable with air vent Cable Length Dimensions 7 6 m 25 ft standard 76 m 250 ft maximum 2 54 x 17 2 cm 1 x 6 75 in Probe Frontal Area 0 875 in squared Weight 0 7 kg 1 5 Ibs Downlooking Ultrasonic Depth Sensor 50 kHz Accuracy 1 to 10 ft 0 01 ft 0 003 m at 22 C 72 F still air 40 to 70 relative humidity Maximum distance from sensor to liquid 9 1 m
27. An Invisible Range can also be set which allows the transducer to ignore reflections from obstructions between the sensor and the water surface such as ladder rungs channel side walls etc Each method has its own advantages and disadvantages selecting the proper method will depend upon the site conditions Calibrate the ultrasonic sensor each time the sensor is installed at a new site 6 1 3 1 Liquid Depth This method requires the depth of liquid in the channel that is contributing to flow In a round pipe the entire depth typically contributes to flow In a weir only the depth that is flowing over the weir plate contributes to flow Many flumes have specific requirements refer to Working with Primary Devices on page 105 Depth calibration is primarily used when Access is available to the primary device for a physical measurement of the liquid depth and when water is flowing during installation of the 950 Flow Meter channel is not dry Note Always re check the Level Adjust when re installing the flow meter 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS CALIBRATION gt ULTRASONIC SENSOR 2 Select Calibrate U Sonic using the UP and DOWN soft keys Press SELECT 38 Sensor Installation 3 Select Standard as the type of Ultrasonic Transducer using the CHANGE CHOICE soft key Press ACCEPT to continue Temperature Time Constant The speed of sound in air varies with the temperature of the air The ultrasonic sensor
28. Basic Programming Note To make changes to the program entries after the basic programming setup press the MAIN MENU key and select SETUP gt MODIFY SELECTED ITEMS Highlight the program entry using the up and down arrow soft keys Basic programming setup must be performed in its entirety after the instrument is installed Refer to the 950 Flow Meter Basic Programming Setup on page 87 for more information The basic program setup will modify all items flow units primary devices program lock sampler pacing site ID velocity direction velocity units velocity cutoff velocity default Note Velocity features will only display when using a 950 area velocity flow meter Step 1 Setup 1 A Press SETUP from the Main Menu to prepare the 950 Flow Meter for use 1 B Press MODIFY ALL ITEMS and press ACCEPT to begin setting up the flow units Step 2 Flow Units Note Different flow units can be selected in the Sampler Pacing programming section see Sampler Pacing on page 32 2 A From the Modify All Items screen highlight Flow Units using the UP and DOWN keys Press the SELECT soft key to continue 29 Basic Programming Setup Main Menu 11 00 AM 21 APR 01 MODIFY LOGIN ALL ITEMS MODIFY ee ALL SELECTED ITEMS READY TO START 2 B Press CHANGE CHOICE to cycle through the flow unit choices Refer to Table 4 for flow unit choices The flow unit will be used whenever a flow reading is displayed
29. CHOICE INPUT CHANNEL FLOW CANCEL SELECT APPROPRIATE UNITS 6 Assign a channel value to the 4 mA current value This value is typically 0 however any value can be set In other words enter the value of the input needed to generate 4 mA of current at the output 11 00 AM 21 APR 01 4 20 mA OUTPUTS ACCEPT 4 mA INPUT VALUE CLEAR 0 00 mgd CANCEL ENTRY SELECT APPROPRIATE UNITS 7 Assign an input value to the 20 mA current level 8 Repeat this process to configure the other 4 20 mA output 8 3 1 3 Calibrating the 4 20 mA Output After wiring the 4 20 mA connection perform a 4 20 mA output calibration The 4 20 mA output calibration requires a multimeter and an interface or access to the 4 20 mA current loop wiring Two 4 20 mA outputs are available and are designated Output A and Output B Both outputs are calibrated the same way and are isolated from each other Calibration may be performed while the 4 20 mA device is in the current loop as shown in Figure 15 or disconnected from the current loop as shown in Figure 16 In either case the multimeter must be set to a 20 milliamp DC range or greater 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt 4 20 mA OUTPUTS 2 Connect a multimeter to the 4 20 mA current outputs per Figure 15 or Figure 16 3 Make sure that the 4 20 mA output is enabled If it is not enabled press CHANGE CHOICE so that the display show
30. Level 91 Program Flow Charts Figure 25 Alarms Menus Flow Chart SIGMA 950 Flow Meter A ALARMS Flowchart Alarms Main Menu arrow indicates enabled K Low Main Battery Memory Battery arrow indicates enabled Low Slate Memory Advanced Slate Memory Full Options Low Bubbler Pres P Clogged Bubbler Report via Modem arms U Sonic Echo Loss Set Relay 1 Xducer Ringing Set Relay 2 U Sonic Failure Set Relay 3 RS485 Timed Out Set Relay 4 or Level Flow Alarm on Enable if Set HIGH pH ORP HIGH select or Fenabled Trigger accept Temperature Condition Disable Point Channel 1 Pick Set Channel 2 One Deadband Channel 3 n Channel 4 Alarm on Enable if Set LOW Channel 5 LOW select OF Fenapleg Trigger raccept Channel 6 Condition Disable Point Channel 7 or Set Flow Rate of Chg Enable if High Set accept Rainfall or enabled Trigger accepti Time accept Disable Point Interval Report To Modem gt Set Relay 1 Set Relay 2 Set Relay 3 Set Relay 4 arrow indicates enabled E 92 Program Flow Charts Figure 26 Calibration Menus Flow Chart Page 1 CALIBRATION Flowchart SIGMA 950 Flow Meter C Calibration PAGE 1 select gt See CALIBRATION FLOWCHART PAGE 2 or Apply Positive Reference Signal to or select Place Sensor in First Buffer select Enter Temp
31. Table 46 Transmission Response that Reflects a 15 in Level Reading Start Slave Address 01 Function 03 Byte Count 04 Data High 00 Data Low 00 Data High 41 Data Low 70 LRC 47 Stop lt CR gt lt LF gt The flow meter response echoes the address and function code which indicates that no problems exist in the communication between the master and 950 The Byte Count field specifies how many 8 bit data items are being returned in the data field With Modbus ASCII this is one half the actual count of ASCII characters transmitted in the data portion of the response The contents of 40007 are shown as two byte values of 00 00 hex and the contents of register 40008 are shown as two byte values 41 70 hex Together these values represent the floating point IEEE representation of the level status 950 Flow Meter Response Time As a result of time lags associated with data acquisition instrumentation could conceivably take up to 12 seconds to respond to a SCADA RS232 request Therefore the SCADA system must be designed to accommodate this potential communication lag For example in a Wonderware application running a Modbus ASCII DDE server the 122 SCADA Modbus System Guidelines com port reply time out must be set to 12 seconds This is the amount of time that the meter will be given to reply to Modbus queries via this serial port Communication Handshaking The 950 Flow Meter contains minim
32. Vitrified sewer 0 011 0 014 0 017 Vitrified sewer with manholes inlets etc 0 013 0 015 0 017 Brick Glazed 0 011 0 013 0 015 Lined with cement 0 012 0 015 0 017 Concrete Culvert straight and free of debris 0 011 0 011 0 013 ree with bends connections and some 0 011 0 013 0 014 Sewer with manholes inlet etc straight 0 013 0 015 0 017 Unfinished steel form 0 012 0 013 0 014 Unfinished smooth wood form 0 012 0 014 0 016 Non metal Concrete Unfinished rough wood form 0 015 0 017 0 020 Sanitary sewers coated with sewage slimes 0 012 0 013 0 016 Paved invert sewer smooth bottom 0 016 0 019 0 020 Rubble masonry cemented 0 018 0 025 0 030 143 Manning Roughness Coefficients Lined or Built up Channels Metal Smooth steel surface Painted 0 011 0 012 0 014 Unpainted 0 012 0 013 0 017 Corrugated 0 021 0 025 0 030 Non metal Cement Neat surface 0 010 0 011 0 013 Mortar 0 011 0 013 0 015 Concrete Trowel finish 0 011 0 013 0 015 Float finish 0 013 0 015 0 016 Finished with gravel on bottom 0 015 0 017 0 020 Unfinished 0 014 0 017 0 020 Wood Planed untreated 0 010 0 012 0 014 Planed creosoted 0 011 0 012 0 015 Unplaned 0 011 0 013 0 015 Plank with battens 0 012 0 015 0 018 Brick Glazed 0 011 0 013 0 015 In cement mortar 0 012 0 015 0 018 Masonry Cemented Rubble 0 017 0 025 0 030 Dry Rubble 0 023 0 032 0 035 Non metal Asphalt Smooth 0 013 0 013 e Rough 0 016 0 016 Vegetal Lining 0 08
33. air dryer canisters are located on the right side of the flow meter A small diameter tube is contained within the sensor cable to supply air from the 950 Flow Meter to the sensor in the flow stream See Figure 11 Figure 11 Bubbler Connections N j 09 7T IN 1 Right side of 950 meter 2 Bubbler line connection 3 Velocity connection 48 Sensor Installation Three ports on the 950 Flow Meter pertain to air flow for bubbler operation Intake Port This port supplies fresh air to the internal air pump The air is drawn through a dryer tube consisting of two hydrophobic filters and a desiccant material that removes moisture and dirt from the incoming air Reference Port This port provides a reference to atmosphere The flow meter measures level by comparing the back pressure against the bubble in the bubbler line with ambient air pressure As the water level increases the back pressure pushing against the bubble increases The transducer first reads the pressure in the bubbler line then at regular intervals switches to the reference port to compare it to the atmospheric pressure This pressure difference is converted to a number which represents the liquid level At a regular interval both the bubbler port and the reference port are switched to open air together and electronically zeroed to eliminate any drift due to changing barometric pressure If the flow meter is to be located where there is any
34. any debris that may prevent a good seal between the lid and the case Charging Under no circumstances should the Alkaline Lantern Battery Pack be charged There are no provisions for charging the battery pack and doing so will result in damage to the battery pack and possible injury to the user Proper Selection of Batteries The proper selection of batteries for the Alkaline Lantern Power Pack is very important The recommended battery for the battery box is the Eveready Energizer Model Number 529 or EN529 CAN These are industrial grade alkaline lantern batteries with Batteries and Chargers spring terminals We only recommend these batteries for the battery box Use of any other battery may cause damage to the battery pack assembly and or decreased battery life When to Replace the Batteries The circuitry associated with the Alkaline Lantern Battery Pack is designed to boost the working battery voltage to 12 VDC or higher while the alkaline batteries discharge and expire As the collective voltage of the alkaline batteries begins to drop the booster circuitry of the Alkaline Lantern Battery Pack will begin to lose its effectiveness As the batteries expire the displayed voltage will begin to drop When the displayed voltage gets to 11 VDC the flashing Low Main Battery warning will appear on the lower right menu bar The flow meter will continue to operate down to 10 5 volts but you should replace the batteries soon If
35. can be used to total flow over a finite period and can be reset as often as desired without affecting the other totalizers The optional mechanical totalizer cannot be reset To reset the resettable totalizer only Select RESET from the TOTALIZER menu A confirmation message will appear Press the YES soft key to reset the totalizer or press the NO soft key if you do not wish to reset the totalizer Programming Features To reset both software totalizers at once Start a program with the RUN STOP key View Totals To view the current totals of both the resettable and non resettable totalizers press VIEW TOTALS from the Totalizer menu Both totalizer values will appear B 17 Screen Saver Mode From the Main Menu select SETUP gt ADVANCED OPTIONS gt SCREEN SAVER MODE The power required to properly light the LCD can consume valuable battery life Screen Saver Mode is a power saving feature B 18 Battery Power B 19 ac Power When the flow meter senses that it is operating on battery power Screen Saver Mode conserves battery life by automatically turning the LCD display off after 3 minutes of keypad inactivity Pressing any key will turn the LCD display back on No configuration is required the meter automatically senses ac or battery operation on power up When operated under ac power Screen Saver Mode can be enabled or disabled manually Enabling the Screen Saver when operating on ac power will prolong the life of the LCD di
36. connected Check the ultrasonic sensor connection on the flow meter Cut or broken cable Check for any knick or cuts in the cable Unusual temperature or inability to read new calibrated level Re calibrate the unit XDucer Ringing False Return Echo mask Real Echoes Liquid is too close to the transducer Obstructions under the transducer Try moving the transducer farther from the liquid more than 15 Check for obstructions on the front and sides of the transducer see section 6 1 3 3 on page 39 Coating on the face of the transducer Clean the transducer face If this is a constant problem try coating the face of the transducer with a very thin film of silicone grease to keep the debris from collecting The transducer resonates against steel mounting rails Use the proper rubber isolation washers No Change in Depth Readings or Inaccurate Depth Readings Check the logged data to see when this started to occur Go to the event log to see if anything happened during the same time Calibration Re calibrate the unit Echo loss or ringing occurs but not enough for detection Check the trouble areas Bad transducer Try a different transducer Loss of Ultrasonic as Depth Measuring Device 140 Blown fuse on CPU board Replace fuse The fuse is located in position F1 under the gray ribbon cable that connects at position J1 see section 9 4 on page
37. data will be logged If using slate mode change to wrap mode The power is interrupted for more than three hours due to a power outage or dead battery Use an ac power backup option This is a customer purchased item when using ac mode Download data and restart program Modem Failure Problem with modem board Contact factory No 4 20 Output Totalizer Stopped Program complete 4 20 not enabled Enable 4 20 137 Troubleshooting Troubleshooting the Bubbler Depth Sensor Problem Cause Solution Low Bubbler Pressure Bubbler does not turn on during initialization Power unit off for 10 seconds and power back on Listen for the bubbler pump to turn on during unitization If the pump does not run contact the factory Desiccant is pink Change the desiccant Desiccant is blue Check the bottom of the cartridge for a blockage or coating Kinks in the bubbler module airlines This is determined with the unit open Remove kinks Clogged Bubbler No Change in Bubbler Depth Readings Incorrect Flow Totals Blockage in the bubble tube Reference port desiccant is pink and is causing a blockage in the reference port Remove the vinyl bubbler tube from the bubbler port on the side of the flow meter case and check for obstructions Visually check the end of the bubble tube port for solids blocking the line Check the bubble line cabl
38. did not receive data with specified time velocity ultrasonic or CPU board Logging intervals are 1 or 2 minutes conditions are poor and the problem continues indefinitely Difficulty receiving a velocity reading Increase the logging interval to allow more time to capture the signal Indicates an internal problem Zero Velocity or Velocity Drop Outs Loss of Area Velocity as Primary Device Sensor is covered with sediment Low particulate levels in the channel Clean the sensor Stir up the water in front of the probe and watch the signal strength If the signal starts to vary this may be an indication of low particulate in the channel Unusual events occurred Check the event log for unusual events that occurred around the time of the velocity problems Radio Interference in the area Blown fuse on the CPU board the prompt was there and then disappears Move the unit to a different location Replace the fuse located in position F1 under the gray ribbon cable that connects at position J1 see section 9 4 on page 79 Inaccurate Velocities Obstructions Obstructions should be a minimum of 5 pipe diameters downstream and 10 diameters upstream Eddies and waves returning flow back into the pipe could be causing incorrect velocities Relocate the probe The invert has an unusual construction such as a rounded section in the middle of the invert or drops that may ca
39. electricity from your body and keep it discharged wear a wrist strap connected by a wire to earth ground Handle all static sensitive components in a static safe area If possible use anti static floor pads and work bench pads 9 2 1 Internal Maintenance Items The following items require access to the inside of the case for service Fuses for the 12 VDC input as well as the RS485 and sampler and analog interface connectors if so equipped Internal desiccant module RAM memory batteries Bubbler Module System upgrades or enhancements 4 20 mA modem alarm relays etc Circuit board repair 9 2 2 Removing the Front Panel Always disconnect the power cable and all other cables from the 950 Flow Meter before removing the front panel T 2 3 Disconnect and remove the power supply and all cables Remove the 18 screws from around the perimeter of the case Carefully pull open the front panel in the same direction as you would to open the front cover Be sure to let the attached connectors J4 and J6 swing out of the way see Figure 17 Note The front panel gasket has a light coating of grease to help assure a water tight seal Do not to contaminate the grease or gasket area during servicing Always replace the gasket if it is damaged or missing Never reassemble the case without the gasket properly installed 77 Maintenance G Oe Figure 17 950 Flow Meter Inside View
40. expander allow multiple slave devices to be connected to a single Modbus master device but it can also be configured to convert incompatible communications parameters such as Modbus ASCII to RTU or vice versa baud rate parity stop bits etc In addition to the port expanders mentioned above other protocol converters from third party manufacturers can be used to convert other industrial protocols to Modbus ASCII E 12 Other Reference Material 124 SCADA ANSI Specification ANSI IEEE Std C37 1 1994 Boyer Stuart A SCADA supervisory control and data acquisition Research Triangle Park NC Instrument Society of America 1993 MODICON Modicon modbus protocol reference guide North Andover MA MODICON Inc Industrial Automation Systems 1996 AEG Schneider Automation Modicon ladder logic block library user guide North Andover MA AEG Schneider Automation Inc 1996 SCADA Modbus System Guidelines E 13 Troubleshooting Tips Problem 950 Flow Meter responds to some Modbus messages but not all Response Check the Register Addresses The flow meter will only respond to valid Modbus message requests If a Modbus message sent to the flow meter asks for stored register addresses for values that are outside of the address range currently supported by the meter the meter will ignore the request The flow meter currently only supports register addresses 40001 through 40083 Consequently a request to read the value
41. flash in the lower right corner of the display to alert you to replace the batteries The meter uses a very small amount of energy from the memory batteries during normal operation To replace the memory batteries refer to Figure 17 and proceed as follows 1 Download all data before removing the batteries Important Note All data will be lost from the meter when the batteries are removed 2 Pull back on and open the Velcro retaining strap 3 Remove the old batteries and insert the new ones 4 Refasten the Velcro retaining strap 83 Maintenance 84 Section 10 Contact Information for U S A and Outside Europe Ordering Information for the U S A By Telephone By Mail 800 368 2723 Hach Company By Fax 4539 Metropolitan Court Frederick MD 21704 9452 U S A 301 874 8459 Ordering information by E mail hachflowsales hach com Information Required e Hach account number if available Billing address e Your name and phone number e Shipping address e Purchase order number e Catalog number e Brief description or model number Quantity Ordering Information for Outside the U S A and Europe Technical Support Repair Service Hach maintains a worldwide network of dealers and distributors To locate the representative nearest you send an e mail to hachflowsales hach com or visit ww hachflow com Technical and Customer Service Department personnel are eager to answer questions about our products
42. from end Displays the data for the selected channel beginning from the most recent point in memory View from time date Displays the data for the selected channel beginning from any desired time and date Enters a new desired time and date Note Totals displayed are calculated by summing the logged data If the date selected precedes available logged data memory has wrapped the total will be incorrect Display Data by Graph Graph day Displays data for a specified date Data for the selected date is graphed from midnight to midnight Graph point in time Displays data for a specified time and date The graph displays three hours of data with the selected point in time at the corner of the graph Graph partial day Zooms in on a portion of the logged data Functions Table 35 Graphing Functions and Descriptions Description Status Bar Displays the time date measured value and unit of measure at the intersection of the data cursor Placing the cursor s data on the status bar eliminates the need for X or Y axis labels and provides a larger viewing area Moving the Data Cursor with the Arrow Keys The data cursor appears as a vertical line in the center of the graph Move the data cursor to the left or right by using the soft keys or the numeric keypad Moving the Data Cursor with the Numeric Keypad The keys 0 9 represent a percentage of full scale Pressing a nu
43. grease content may require a slightly higher bubble rate to keep debris from plugging the bubbler line However setting an excessively high bubble rate to keep the line clear is not advised Instead use the Auto Purge feature This applies a high pressure purge to the bubber line at a regular interval The recommended bubble rate is one bubble per second Check the bubble rate in a depth of water that is typical for the installation and adjust if necessary When setting the bubble rate at a location other than the installation site use the same inside diameter and 50 Sensor Installation length of the bubbler line that will be used at the site or the bubble rate may be different when the flow meter is actually installed Note High bubble rate and or short Auto Purge intervals will decrease battery life due to the increased air pump run time required to replenish the air reservoir When operating the battery power keep bubble rates at one bubble per second Set the Auto Purge intervals to at least 30 minutes To set the bubble rate highlight the SET BUBBLE RATE selection using the UP and DOWN arrow soft keys then press the SELECT soft key Enter the bubble rate number from 1 to 5 then press the ACCEPT soft key to save the changes Calibrate Bubbler Procedure 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt BUBBLER 2 Set the Bubble Rate to 2 or 3 or approximately 1 bubble per second Install 3 ft o
44. in 10 2540 cm Area Velocity Trapezoidal Channel Enter width of channel bottom width of channel top and channel depth range for all 4 999 99 in 10 2540 cm U Shaped Channel Enter channel width 4 999 99 in 10 2540 cm Table 7 Weir Choices Weir Description Cipolletti Crest width is in or cm 1 960 in or 2 54 2438 cm Contracted Rectangular Crest width is in or cm 1 960 in or 2 54 2438 cm 31 Basic Programming Setup Table 7 Weir Choices continued Weir Non Contracted Rectangular Description Crest Width is in or cm 1 960 in or 2 54 2438 cm ThelMar V Notch Size in inches 6 8 10 12 or 15 in Angle of notch in degrees 22 5 to 120 Compound V Notch Angle of notch in degrees 22 5 120 notch depth in inches rectangular width in inches 0 120 in or 0 304 cm Contracted or non contracted Table8 Flume Choices Flumes Description Parshall Flume size in inches 1 2 3 6 9 12 18 24 30 36 48 60 72 84 96 108 120 or 144 in Trapezoidal Flume size 60 S 60 L 60 XL 45 2 45 12 H Type Flume size in feet 0 5 0 75 1 0 1 5 2 0 2 5 3 0 or 4 5 ft HL Type Flume size in feet 3 5 4 0 HS Type Flume size in feet 0 4 0 6 0 8 or 1 0 ft Leopold Lagco Flume size in inches 4 6 8 10 12 15 18 20 21 24 27 30 36 42 48 54 60 66 or 72 in Palmer Bowlus
45. is equipped with temperature compensation to help eliminate the effect of temperature variation under normal site conditions The transducer must be equal to the ambient air temperature at the site prior to calibration for optimum results The manufacturer also recommends that sensors be shielded from direct sunlight for this reason 4 Enter the ambient air temperature at the transducer location For optimum results allow enough time 100 minutes to ensure that the sensor is at equilibrium with the surrounding ambient temperature Press ACCEPT to continue Select the Liquid Depth method and enter the new level Take a physical measurement of the liquid depth and enter the value Press ACCEPT when finished 6 1 3 2 Sensor Height This method requires you to enter the distance between the face of the ultrasonic sensor and the zero flow point in the primary device The zero flow point in a primary device is the level at which flow ceases In a round pipe the zero flow point would typically be the invert or bottom of the pipe In a V notch weir the zero flow point occurs when the liquid behind the weir is level with the bottom of the V There would still be liquid behind the weir plate but it would not be contributing to flow Sensor Height calibration is generally used when access to the primary device is difficult such as confined space entry in a manhole or there is no liquid flowing during installation of the flow meter 1 From the
46. meter and is labeled Sub Probe The connector is keyed and can only be inserted in the proper orientation key up See Table 15 for pin assignments Table 15 Submerged Pressure Sensor Interface Pin Assignments Pin Signal Description Wire Color A V red B signal yellow C signal green D ground black 6 5 2 Submerged Depth Only Sensor Programming 1 From the Main Menu select OPTIONS gt LEVEL SENSOR 2 Select Submerged Xducer using the CHANGE CHOICE soft key then press ACCEPT 6 5 3 Submerged Depth Only Sensor Calibration 46 The submerged depth only sensor does not need to be calibrated for each use In general calibrate the probes e The first time a new meter and sensor is used e Whenever a sensor is replaced with another sensor e Every 6 months Submerged depth only sensor calibration requires a graduated cylinder or bucket with at least 16 cm 6 in of water and a ruler Calibrating the submerged sensor characterizes the 950 Flow Meter electronics to the unique characteristics of each individual sensor In addition the calibration compensates for any sensor drift that may occur over time 6 months or greater as the materials in the sensor age To ensure optimum accuracy calibrate the meter approximately twice per year or when changing to a different submerged sensor 1 From the Main Menu select OPTIONS ADVANCED OPTIONS CALIBRATION SUBMERGED PROBE 2 Choose the orientation
47. original blue color within 24 hours If the indicator disc fails to return to blue after replacing the desiccant module replace the disc The indicator disc is held in place by a small clip and screw To gain access to the indicator disc you must first remove the CPU board Be sure to observe proper handling for static sensitive CMOS devices Maintenance 9 7 Memory Batteries Random Access Memory RAM is a very reliable data storage medium for microprocessor applications however RAM requires power at all times to store its data If power is removed the data stored in the RAM chip is lost Therefore it is not feasible to power the RAM chips from the meter power supply because you would lose your data and program settings every time you unplugged the power cord A separate battery pack located inside the flow meter powers the RAM chips and the real time clock The memory batteries P N 2709 keep the program entries and logged data stored in RAM memory when the main power fails or is removed for transport or replacement The memory batteries consist of two 1 5 VDC C cells They are located below and behind the CPU circuit board which is attached to the inside of the front panel assembly They are easily replaced without having to remove the CPU board assembly Use only good quality alkaline C cells as replacements If the memory battery voltage falls too low to properly maintain the program settings a warning MEMORY BATTERY will
48. pack two bytes of data into each register This alone presents no problems Unsigned two byte 16 bit integer values in the range of 0 to 65535 can be stored and retrieved from these registers without any problems or complications The complications arise when the stored value is a floating point value which by IEEE definition require 4 bytes 32 bits The IEEE standard for floating point values states in part that the 8 most significant bits represent the exponent and the remaining 23 bits plus one assumed bit represent the mantissa and the sign of the value Since a data word consists of two bytes a floating point value is represented by two data words Because a single Modicon register consists of one word or 2 bytes two consecutive Modicon registers are needed to store one floating point value The representation of a floating point value can be broken down into a High Order and a Low Order word Additionally each word can be broken down into a high order byte and a low order byte Table 47 and Table 48 depict how a IEEE floating point value is usually represented and how the Modicon stores a floating point value 123 SCADA Modbus System Guidelines The complications arise because Modicon doesn t store floating point values in this standard IEEE format Modicon stores floating point values the opposite way with the Low order word in the first register and the High order word in the second register Table 47 I
49. stream Use this diagnostic to determine that the probe is mounted for optimal velocity measurement The closer to 100 the Signal Strength is the more stable the velocity reading will be If the signal seems low 50 or less it may be due to improper installation of the probe or a lack of particulate in the flow stream 11 00 AM 21 APR 01 VELOCITY ANALYSIS SIGNAL STRENGTH 90 VELOCITY 7 00 ft s RETURN B 15 5 Event Log Programming Features The event log diagnostic provides a time date stamped list of significant events occurring in the flow meter Review these events to find out when an event occurred and what events preceded or followed the event of interest Events may be viewed in chronological order from the beginning or end of the event list by selecting VIEW FROM START or VIEW FROM END respectively Fixed Alarms Fixed alarms Table 38 show the On Off status associated with the alarm For instance U sonic Echo Loss On at some time date will appear When the condition ends U sonic Echo Loss Off will appear Table 38 Event Log Fixed Alarms Event Explanation MEMORY BATTERY Internal memory battery is low MODEM FAILURE Modem chip modem board failure U SONIC ECHO LOSS No return signal detected XDUCER RINGING The return signal is detected too soon U SONIC FAILURE Ultrasonic board detects an error RS485 TIMED OUT Communication problem with RS485 Channel Alarms Channel alarms show the
50. that is logging at 5 minute intervals Memory can be configured in slate or wrap mode Note When slate memory mode is used and becomes full the 950 will enter program complete mode and stop logging data Slate Memory Mode Slate mode causes logging to stop when memory becomes full The flow meter continues to operate but no more data is logged Use this mode so no data is lost from the beginning of the logging period Wrap Memory Mode In wrap mode when memory becomes full the oldest reading is discarded each time a new reading is taken When memory becomes full the flow meter continues to operate and log data This mode is best used to receive the most recent data readings Memory Mode Configuration 1 Select DATA LOG from the Advanced Options menu 2 Select MEMORY MODE using the UP and DOWN soft keys Press ACCEPT 3 Press CHANGE CHOICE to pick either Slate or Wrap Press ACCEPT B 14 Datalogging Configurations 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS DATA LOG 2 Highlight SELECT INPUTS using the UP and DOWN soft keys Press SELECT 3 Highlight the channel to log using the UP and DOWN soft keys Certain channels require more information Press CHANGE CHOICE to select Logged or Not Logged Press ACCEPT Enter a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar along the bottom edge of the display 6 Select another channel to configur
51. the front panel assembly and the Base Board is located inside the back section of the case In addition a liquid crystal display LCD circuit board is located behind the CPU board The LCD board is an integral part of the LCD screen and contains no user serviceable components see Figure 17 9 4 Fuse and Connector Locations Four fuses are provided to protect the 950 Flow Meter electronics from damage due to short circuits or excessive current draw Three fuses are located on the Base Board Figure 19 and one fuse is located on the CPU Board Figure 20 Table 30 through Table 33 list the functions associated with the connectors and the fuses and their ratings for both circuit boards 79 Maintenance Figure 19 Base Board F2 4 Amp F3 1 Amp Table 30 Base Board Fuses ID Description Type amp Rating 12 VDC Interface Connector Main power input to meter F1 Pin A ground Pin B 12 VDC 4 Amp 125 V ac Slow blow 5 x 20 mm P N 2604 F2 12 VDC Sampler interface connector Pin A 12 VDC 4 Amp 125 V ac Slow blow 5 x 20 mm P N 2604 Pin B ground F3 Analog Input Option Interface connector if so equipped 1 Amp 250 V ac Fast blow 5 x 20 mm P N 2536 Pin A 12 VDC Pin B ground Table 31 Base Board Connectors ID Description J1 12 VDC Main P
52. to continue Read the Velocity Cutoff information screen Press any key to continue 9 Setthe Velocity Cutoff using the keypad Press ACCEPT 10 Set the Velocity Default using the numeric keypad Press ACCEPT Press RETURN to go back to the Setup Menu or the Main Menu key to return to the beginning 6 4 3 Low Profile Velocity Only Sensor Calibration No calibration is required for the velocity sensor The transmit frequency is fixed with a highly accurate quartz crystal controlled frequency generator that cannot be adjusted 45 Sensor Installation 6 5 Submerged Depth Only Sensor The submerged depth only pressure sensor is a pressure transducer that contains a titanium diaphragm As the water pressure increases with increasing depth in the flow stream the diaphragm is deflected or pushed against a solid state device called a strain gauge The strain gauge converts the pressure against the diaphragm to a voltage As the depth in the flow stream increases the voltage coming from the submerged pressure sensor increases The voltage is read by the microprocessor in the 950 Flow Meter at a regular interval and converted to a number which represents the depth in the flow stream The depth reading can then be converted by the meter to a flow rate based on the mathematical formula for the selected primary device 6 5 14 Submerged Depth Only Sensor Connection The submerged depth only sensor connector is located on the left side of the flow
53. to the 950 Flow Meter as well as how to install the optional water quality probes pH ORP Dissolved Oxygen Conductivity Temperature Probe Important Note 950 Flow Meter options described in this section of the manual may not be suitable for use with CE marked models of the 950 Flow Meter See section 4 8 on page 27 for details on approved CE options 7 1 Rain Gauge 7 1 4 Rain Gauge Connection An external tipping bucket rain gauge such as P N 2149 can be connected to the Rain Gauge connector of the 950 Flow Meter The rain gauge provides a dry contact closure to the flow meter Table 16 Rain Gauge Connector Pin Assignments Pin Signal Description 12 VDC source output not used 12 VDC pulse input not used not used nim OO oo gt not used 7 1 2 Rain Gauge Programming 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt DATALOG 2 Highlight SELECT INPUTS using the UP and DOWN arrow soft keys and then press SELECT Note If logging is enabled on any channel that channel will have an arrow in front of the channel name to signify that the channel is logged Highlight Rainfall using the UP and DOWN soft keys then press SELECT 4 Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT 5 Enter a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar along the bottom edge of the display
54. value that caused the alarm to occur or go away and show a status ON OFF to indicate if the alarm occurred or went away at that time date Event Log Channel Alarms e LEVEL FLOW e FLOW RATE OF CHG e pH e RAINFALL e CH5 e CH1 e CH6 e CH2 e CH7 e CH3 e VELOCITY e CH4 e TEMPERATURE B 16 Flow Totalizer From the Main Menu select SETUP gt ADVANCED OPTIONS gt FLOW TOTALIZER The Flow Totalizer is a series of up to three numeric counters that keep track of the total flow being measured Two software totalizers are standard a third mechanical totalizer is available as an option The two software totalizers consist of a resettable totalizer and a non resettable totalizer Both software totalizers are set to zero upon program start Scaling multipliers are provided to allow you to tailor the totalizer response to meet the requirements of the application Some applications with high flow rates will require a high scaling factor while low flow rates will require a low scaling factor The scaling factor is displayed whenever a total flow number is displayed As indicated in the Status Screen below the total flow is displayed as TOTAL x1000 465 gal 103 Programming Features 104 Multiplying the displayed total flow by the scaling factor 1000 gives you an actual total flow of 465 000 gallons 11 00 AM 21 APR 01 STATUS SCREEN LEVEL 8 688 in FLOW 71 39 mgd TOTAL x1000 465 gal pH 7 2 pH BATTERY 16 9 v
55. 0 0 500 Excavated or Dredged Earth straight and uniform 0 016 0 022 0 035 Earth winding and sluggish 0 023 0 030 0 040 Rock cuts 0 030 0 040 0 050 Unmaintained channels 0 040 0 070 0 140 Natural Channels Minor streams top width at flood 100 ft Fairly regular section 0 030 0 050 0 070 Irregular section with pools 0 040 0 070 0 100 144 Appendix Engineering Drawings Submerged Flow Meter 2662 d 12Vdco x 2717 4 RS232 lt d Sampler P e Sub Probe 2549 2 145 950 Flow Meter Ultrasonic Meter Assembly Engineering Drawings z er 01 3Xoeig L er o1 ped L er 01 ureaq z zr 01 suum ueber BUMM v 622 AS weibeiq osse BuulM ees 8vSoc z sr 01 xoeig L SP 01 wo 9A Z vr 01 uaap L vf 01 poH dgodfhdo Ao god 9luoselnf GeS UO Zf 01 12e0UUO2 Sf pue pf 0 JOOUUOH 98 66 146 Engineering Drawings 950 Flow Meter Area Velocity 1 of 2 Z8LE g Od Ayoojanjeay Lere y uo zf 0 JOOUUOD y ZOLL d Od NdI 960 eui UO Jf 01 JOSUUOD Jejdures N
56. 0 Email sales mmi europe com www flow tronic com For France Spain and Great Britain France HACH LANGE FRANCE S A S 33 Rue du Ballon93165 Noisy le Grand Telephone 33 0 1 48 15 68 70 Fax 33 0 1 48 15 80 00 Email info hach lange fr www hach lange fr Spain HACH LANGE S L U C Larrauri 1C 2 PI 48160 Derio Bizkaia Telephone 902 131441 94 6573388 Fax 94 6573397 E mail info hach lange es www hach lange es Great Britain HACH LANGE LTD Pacific Way Salford Manchester M50 1DL Telephone 0 161 872 1487 Fax 0 161 872 7324 Email sales hach lange co uk www hach lange co uk 87 Contact information for Europe 88 Appendix A Program Flow Charts Figure 22 Overview of Basic Program Menus Overview of Basic Program Menus ET Graph Data Table Data Date Tim Flow May 20 2 10 pm 314 233 May 20 2 15 pm 334 118 May 20 2 20 pm 377 235 May 20 2 25 pm 423 342 Flow Units Level Units Primary Device Program Lock Sampler Pacing Site ID Total Flow Units Velocity Direction Velocity Units Velocity Cutoff Display Data Options 4 20 mA Outputs Alarms Calibration Datalog Diagnostics Flow Totalizer Load Program Stormwater Communication Setup Screen Saver Mode Setpoint Sampling Time Date Purge Line if bubbler OPTION MENU Advanced Level Sensor L lt Options if OptiFlo Setup MAIN MENU Status
57. 120 SCADA Modbus System Guidelines Table 44 SCADA Modbus Units of Measure Codes Unit Code Unit Code GPH LPS LPM LPH MGD PH ORP PPM PPB MGL PCTSAT MSIEMENS a oa Co N A MICROSIEMENS PCTPERDEGC 17 DEGREE F C1 19 VOLTS 20 ft s 21 MPS 22 PCT O2 23 PCT H2S GPM 25 VDC 50 Query The Modbus ASCII query must take the form shown below that specifies the starting register and number of registers to be read des Pegg Adams aaa eet OS e som an 121 SCADA Modbus System Guidelines Response For example to read the level channel of the 950 Flow Meter the query must be as indicated in Table 45 Table 45 Channel Query to Read Level Example Start i Slave Address 01 Function 03 Starting Address High 00 Starting Address Low 06 No of Registers High 00 No of Registers Low 02 LRC F4 Stop lt CR gt lt LF gt The master queries the flow meter using a Read Holding Registers request which implies a 4XXXX register reference to slave device address 01 The message requests data from holding registers 40007 40008 to obtain the level information which requires two registers to store the floating point value Note that registers are referenced from zero in the data field The 950 Flow Meter responds with the following transmission reflecting a level reading of 15 0 inches
58. 6 000 data points Daily statistics Available for up to 32 days Recording Intervals 1 2 3 5 6 10 12 15 20 30 60 minutes Data Logging Sampler Output 12 to 17 VDC pulse 100 mA max at 500 ms duration RS232 up to 19 200 baud Modem 14400 bps V 32 bis V 42 MNP2 4 error correction V 42 bis MNP5 data compression MNP 10 EC Cellular Protocol Pager SCADA Modbus communication protocol standard through RS232 or optional modem CE some 950 models such as 3248 3522 and 2672 when used as detailed in manual Section 2 8 CE 230V AC DC power adaptor and cETLus 115V AC DC power adaptor UL CSA 61010 1 Safety Std Communications CE Mark Specifications 2 1 Factory Installed Options Integral pH Temperature Meter pH and ORP cannot be simultaneously measured Field selectable to log pH temperature independent of flow or in conjunction with flow also controls sample collection in response to value of low high setpoints pH combo 3 4 NPT in line ryton ASG V Flat 100 ohm KTD GND in glass DJ with porous gel Ag AgCl gel in Dynagan out CE cable 0 to 3 pH Control Logging pH Temperature Sensor pH Range Operating Temperature 0 to 80 C 0 to 176 F Dimensions 1 9 D x 15 24 cm L 0 75 x 6 in with 1 9 cm 0 75 in mpt cable end Totalizers 6 digit non resettable mechanical Units ft gal m liter acre ft Pressure Rating 100 psi maximum pH
59. 727 3 RS232 Connector 2 Extension Cable optional P N 3358 4 DB9 Serial COM Port 8 1 2 RS232 Programming Note Long runs of RS232 cable especially if they are run near large motors or fluorescent lights can cause communication errors and may require a slower baud rate 1 From the Main Menu select OPTIONS ADVANCED OPTIONS COMMUNICATIONS SETUP gt RS232 SETUP 2 Press CHANGE CHOICE to select a baud rate for data communications 1200 2400 4800 9600 or 19200 baud The higher the baud rate setting the faster data will transfer Set the baud rate to the highest setting allowed by the computer The baud rate must correspond to the baud rate selected in the software Press ACCEPT 62 Communications Setup 8 2 Modem 8 2 1 Modem Connection Use this connection with the optional internal modem P N 4578 and a standard dial up public telephone line This interface can also be used for the SCADA Modbus interface See Appendix E on page 117 Connect the telephone line to the meter with the Modem Line Filter Connector P N 4459 2 pin connector The RJ11 style phone connector adapter P N 3188 can also be provided for modular connection if desired Figure 14 Table 23 Modem Connection Pin Assignments Pin Signal Description Wire Color tip red 12 VDC N A 1 Modem Cable Assembly P N 2862 3 RJ11 Style Adaptor P N 3188 2 Redwire 4 Green wire 8 2 2 Modem Programming
60. 79 Problem with the ultrasonic board Contact factory Troubleshooting Troubleshooting the Low Profile Velocity Only Sensor Problem Cause Solution Zero Velocity Reading The sensor is not covered with water Make sure the sensor is in water Not enough suspended solids Throw dirt into the water upstream of the sensor to reset the sensor Look at current status and watch for increased velocity signals Re evaluate application The beveled face of the sensor is covered with sediment algae growth rags etc Clean the sensor Erratic Velocity Readings The sensor is not covered with water Make sure the sensor is in water Not enough suspended solids The beveled face of the sensor is covered with sediment algae growth rags etc Throw dirt into the water upstream of the sensor to reset the sensor Clean the sensor Occurs only when using a laptop Make sure the laptop is not running on a power inverter or malfunctioning serial port Electromagnetic interference near the meter or sensor cable i e a large pump motor Make sure there are no electromagnetic interferences Remove interferences or move the meter and sensor cable away from the interferences Problem occurs at the same time of the day because the sensor is not covered with water during certain times of the day Turbulence in front of the sensor Make sure the probe is co
61. 957 17 8 0 858 27 6 1 051 22 6 0 953 17 6 0 854 27 4 1 047 22 4 0 949 17 4 0 850 27 2 1 043 22 2 0 945 17 2 0 846 27 1 039 22 0 941 17 0 842 26 8 1 035 21 8 0 937 16 8 0 838 26 6 1 032 21 6 0 933 16 6 0 835 26 4 1 028 21 4 0 929 16 4 0 831 26 2 1 024 21 2 0 925 16 2 0 827 26 1 020 21 0 921 16 0 823 25 8 1 016 20 8 0 917 15 8 0 819 25 6 1 012 20 6 0 913 15 6 0 815 25 4 1 008 20 4 0 909 15 4 0 811 25 2 1 004 20 2 0 905 15 2 0 807 60 Section 8 Communications Setup Important Note 950 Flow Meter options described in this section of the manual may not be suitable for use with CE marked models of the 950 Flow Meter See section 4 8 on page 27 for details on approved CE options Data in the 950 Flow Meter can be transferred to a personal computer PC using data management software through a direct cable between the PC and meter the cellular modem option standard modem or the portable Data Transfer Unit DTU See Figure 12 The Data Transfer Unit DTU is a hand held portable device that allows the user to connect to the flow meter using an RS232 serial cable Data is transferred from one or more 950 Flow Meters into the DTU After collecting data from one or more meters the DTU can transfer the information to a PC running data management software For detailed information refer to the Data Transfer Unit Manual Cat No 3516 89 The 950 Flow Meter can also use Supervisory Control and Data Acquisition SCADA Mod
62. DDRESS FUNCTION DATA LRC END HEX HEX HEX HEX HEX 1 Char 2 Chars 2 Chars n Chars 2 Chars 2 Chars CRLF E 3 Address Field The address field of an ASCII message frame ranging from 0 to 247 decimals consists of two characters that represent the slave address Individual slaves are assigned values between 1 and 247 A master addresses a slave by putting the slave s address in the address field of the message frame When the slave sends its response it places its own address in the address field of the message frame to let the master know which slave is responding 117 SCADA Modbus System Guidelines The device address of the 950 Flow Meter is set via the front keypad in the 950 Communications menu 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt COMMUNICATIONS SETUP gt MODBUS SETUP 2 Enter a value between 0 and 247 11 00 AM 21 APR 01 MODEM SETUP ACCEPT DEVICE ADDRESS 1 RETURN ENTER 0 247 E 4 Function Field The function code field of an ASCII message frame ranging from 1 to 255 decimals consists of two characters that represent the type of action the master is requesting from the slave Of these functions the 950 Flow Meter currently supports function 3 Read Holding Registers When a message is sent from the master to a slave device the function field tells the slave what kind of action to perform For example this may include reading the channel values of Level and Veloci
63. EEE Floating Point Representation First Register i e 4001 Second Register i e 4002 High Word High Byte High Word Low Byte Low Word High Byte Low Word Low Byte Table 48 Floating Point Values Representation First Register i e 4001 Second Register i e 4002 Low Word High Byte Low Word Low Byte High Word High Byte High Word Low Byte Since the Modbus protocol doesn t define how floating point values are handled or stored some Modbus capable servers incorrectly use the normal High word Low word format for converting the Modbus message response to the client application Since Modicon stores the floating point values in the oppOodbus and floating point numbers E 11 Port Expanders and Protocol Converters In some situations there may not be a Modbus ASCII port available for use with the 950 Flow Meter A good example might be where there is a need to install a flow meter at a remote pump site that already has a single Modbus line connected to a PLC that is used to control the pumps Port expanders are available from third party manufacturers these allow several Modbus slave devices to be connected to a single Modbus Master device Typically a single port expander will have 3 5 separate Modbus ports on it Depending on the manufacturer the user may be able to configure each of these ports for different communications parameters In essence not only does this type of port
64. L3 ppm NOT LOGGED 1 min CHANNEL 4 ppm NOT LOGGED 1 min i CHANNEL 5 ppm NOT LOGGED 1 min CHANNEL 6 ppm NOT LOGGED 1 min CHANNEL 7 ppm NOT LOGGED 1 min MEMORY MODE WRAP B 2 Displaying Data The Display Data function provides the recorded data for any channel being logged in a tabular report or a graph In addition for tabular reports the data can be viewed from the beginning from the end or from a specific point in time A graph can display any 24 hour period zoom in to any portion of the 24 hour period for finer detail or center the graph on a specific point in time B 3 Selecting the Channel Note Only the channels for which logging has been enabled will be listed 1 Press DISPLAY DATA from the Main Menu to display a list of logged channels 2 Highlight the desired channel using the UP and DOWN arrow soft keys then press SELECT 11 00 AM 21 APR 01 DISPLAY DATA SELECT prow RAINFALL RETURN 95 Program ming Features B 4 Tabular or Graph Format 1 Highlight the desired display method using the UP and DOWN soft keys then press SELECT 11 00 AM 21 APR 01 DISPLAY DATA SELECT pispLay DATA i DISPLAY BY GRAPH RETURN Table 34 Display Data Functions and Descriptions Function Display Da Description ta by Table View from start Displays the data for the selected channel beginning with the first oldest data point in memory View
65. LEVEL ADJUST key will calibrate the displayed reading to the actual level in the channel e n a weir or flume use a stilling well Silt and sediment build up in the stilling well is unlikely e nround pipes use the manufacturer s mounting bands or locate the bubbler line along the wall in a slot or groove and cover it so it does not protrude into the flow stream and collect debris 6 6 3 Depth Only and Bubbler Area Velocity Calibration Bubbler calibration requires a graduated cylinder with at least 16 cm 6 in of water a ruler and 1 m 3 ft of bubbler line The bubbler is calibrated at the factory and characterizes the electronics to the internal pressure transducer The internal pressure transducer is the device that converts the pressure in the bubble line to a voltage that is read by the microprocessor Recalibrate the sensor at least once per year to ensure optimum accuracy When selecting Bubbler from the calibration menu you are presented with three choices e Set Bubbler Rate e Calibrate Bubbler e Auto Purge Set Bubble Rate Note Excessive bubble rates could cause an increase in the level reading due to friction on the bubbler line Always readjust the level using the LEVEL ADJUST key after making changes to the Bubble Rate This will compensate for errors induced by changes in the bubble rate This setting allows you to vary the rate of bubbles coming from the end of the bubbler line Some streams with a high solids or
66. Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt ULTRASONIC SENSOR 2 Select Calibrate U Sonic using the UP and DOWN soft keys Press SELECT Select Standard as the type of Ultrasonic Transducer using the CHANGE CHOICE soft key Press ACCEPT to continue 4 Enterthe ambient air temperature at the transducer location For optimum results allow enough time 100 minutes to ensure that the sensor is at equilibrium with the surrounding ambient temperature Press ACCEPT to continue Select the Sensor Height method and enter the new level Enter the distance from the face of the transducer to the zero flow point of the primary device 7 Press ACCEPT when finished 6 1 3 3 Setting the Invisible Range 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt ULTRASONIC SENSOR 2 Select the Invisible Range option using the UP and DOWN soft keys Press SELECT to continue Enter the Distance to End of the Invisible Range using the keypad 4 Select either inches or centimeters using the CHANGE UNITS soft key The distance must be greater than the minimum deadband of 23 cm 9 in for the 75 kHz sensor and 38 1 cm 15 in for the 50 kHz sensor 5 Press ACCEPT when finished 39 Sensor Installation 6 2 In Pipe Zero Deadband Ultrasonic Depth Sensor 6 2 1 The in pipe zero deadband ultrasonic depth sensor is used in pipes where depth measurement near the top of the pipe is desired The sensor
67. N soft keys and then press SELECT Highlight Conductivity Temperature COND TEMP using the UP and DOWN soft keys then press SELECT Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT Enter a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar along the bottom edge of the display 6 Optional Device Installation Press CHANGE CHOICE to select temperature units C F Press ACCEPT 7 5 4 Conductivity Probe Calibration 1 5 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt CONDUCTIVITY Clean and dry the probe Place the sensor and thermometer in the calibration solution The temperature sensor is located in the middle of the sensor body allowing the probe to be completely submerged in the solution Allow the sensor to stabilize in the solution about 10 minutes to ensure that the probe and the solution are the same temperature Enter the temperature correction factor or enter zero 0 for no correction factor Note The temperature correction factor is used to compensate for the effects of temperature on the conductivity readings at the point of installation The conductivity of a solution is temperature sensitive Therefore the actual conductivity of the solution will change with the temperature Each site may have a different correction factor depending on the major constituent of the flow str
68. R line DB 9 Pin 4 on the 1727 cable Response Check the Baud Rate The baud rate of the 950 Flow Meter is configured from 1200 19 200 and must match the baud rate of the device communicating with the meter Response Check the Communication Parameters The communications parameters of the 950 Flow Meter meter are fixed except for the baud rate and can not be changed The device communicating with the flow meter must be configured with the exact same communication parameters as the meter These parameters are as follows e 7 Data Bits e 1 Stop bit e 1 Start bit e Even parity Response Check the Modbus Device Address assigned to the 950 Flow Meter Modbus devices including the 950 Flow Meter have a unique configured device address in the range of 1 to 247 This address is embedded in the first two characters of the Modbus message The flow meter will only respond to messages encoded with the same 125 SCADA Modbus System Guidelines address as the meter If the meter receives a valid Modbus message with an encoded device address other than the address the meter is configured for it will ignore that message Response Check the Modbus mode There are two different forms of Modbus ASCII and RTU Currently the 950 Flow Meter only support Modbus ASCII Consequently the device communicating with the meter must be setup for Modbus ASCII The meter will not respond to Modbus RTU messages Problem The data values being returned by p
69. Response Time 5 seconds to 95 of full response ORP Meter Reading 86 15 mV 25 C in pH 7 00 saturated with Quinhydrone Slope 170 mV 25 C pH 4 7 saturated with Quinhydrone Temperature Range 0 to 80 C 0 to 176 F Integral Dissolved Oxygen Meter Field selectable to log dissolved oxygen independent of flow or in conjunction with flow Also Control Logging controls sample collection in response to value of low high set points Measurement Method Polargraphic Sensor Temperature compensated impact resistant polypropylene body Measurement Range 0 to 20 mg L dissolved oxygen Resolution 0 01 mg L Accuracy 0 02 mg L Operating Temperature 0 to 50 C 32 to 122 F Dimensions 1 65 x 12 7 cm 0 65 x 5 in with 1 95 cm 0 75 in mpt cable end Integral Conductivity Meter Field selectable to log conductivity independent of flow or in conjunction with flow It also Control Logging controls sample collection in response to value of low high set points Sensor Temperature compensated impact resistant polypropylene body Measurement Range 0 to 100 mS cm Resolution 0 01 mS cm or 1 mS cm user selectable Accuracy 1 of reading 0 05 mS cm Operating Temperature 0 to 50 C 32 to 122 F Dimensions 1 7 x 12 7 cm 0 67 x 5 in with 1 9 cm 0 75 in mpt cable end 10 Specifications Rain Gauge Input General Information F
70. ace Sample on High Condition and Sample on Low Condition can be enabled at the same time There is no limit to the number of sampling triggers that can be enabled at one time B 21 Stormwater 106 A stormwater monitoring program designed specifically to meet the NPDES stormwater requirements is built in to the Sigma 950 Flow Meter Rainfall is monitored with an optional Rain Gauge A connection is then made from the flow meter Sampler Interface to an automatic liquid sampler A typical stormwater program might be configured to activate when a storm causes a level of at least 3 in 7 6 cm in the outfall channel and 0 10 in 2 5 mm of rainfall within 30 minutes Or it might be desirable to activate the program if either the rainfall occurs or the channel level exceeds the limit Any combination of rainfall and level conditions can be used to activate a stormwater program Specific requirements can vary however from state to state Consult state regulatory groups for recommendations on stormwater permit requirements for specific applications 1 To configure the Stormwater program in the flow meter proceed as follows 2 From the Main Menu select OPTIONS ADVANCED OPTIONS STORM WATER 3 Highlight STORM WATER on the Advanced Options Menu then press the SELECT 4 Press CHANGE CHOICE to enable Storm Water then press ACCEPT 5 Select a Start Condition Programming Features Rain Level Rain and Level both conditions mus
71. ad Acid Gel Cell Batteries The manufacturer s lead acid batteries are designed to prevent electrolyte leakage from the terminals or case The electrolyte is suspended in a gel which ensures safe efficient operation in any position Gel cells are classified as Non Spillable and meet all requirements of the International Air Transport Association Maintenance The manufacturer s lead acid batteries are maintenance free Charging The manufacturer s lead acid cells are designed to be fully charged in 22 to 24 hours using their lead acid battery charger Do not exceed 24 hours or you may damage or shorten the life of the battery The charge rate is 500 mA DC LED is lit indicating the battery is charging The battery is fully charged when the LED indicator turns off Temperature At higher temperatures the electrical capacity that can be taken out of a battery increases At lower temperatures the electrical capacity that can be taken out of a battery decreases However excessive heat kills batteries Avoid placing batteries near heat sources of any kind To maximize battery life operated the battery at an ambient temperature of 20 C 70 F The permissible operating temperature range is 15 to 50 C however use in the 5 to 35 C temperature range is recommended Storage Store lead acid batteries in a cool dry place Their low self discharge rate and excellent charging characteristics permit storage for up to one year without loss o
72. age validated 130 No The first two characters in the message after the colon denote the Modbus device address in Hexadecimal Either change the Modbus device address of the 950 or change the address in the Modbus server No v The problem is in either the Modbus Master polling device or the communications media Correct problem and then check for response again 950 SCADA Modbus No Response Troubleshooting Flow Chart 5 of 5 Returned values do not match the values in the 950 display are you URE the correc register addresses are SCADA Modbus System Guidelines le g If polling for flow requesting register 40033 being requested for the values you want NO the Modbus device address of the 950 is correct No Check the Modbus device address in the Communications Setup menu of the 950 Change as needed Verify the correct register addresses in Appendix H and change the address of the registers being requested as needed Yes baud rate of the 950 match that of the Modbus Server No Change the baud rate in either the 950 or the Modbus server so that both are set to the same baud rate Yes Are the integer values for Units Of Measure being returned correctly Yes
73. ak in 0 1 N HCI P N 14812 53 for 30 minutes and rinse well with distilled water Chemical degradation of pH glass can occur rapidly in a high temperature or high pH environment yielding sluggish response Low temperature environments can double the impedance for every 8 C drop below 25 C A high impedance electrode is extremely sensitive to electrical noise e g electrode S uin A oscillating electrical fields generated by motors generators or discharges from electrical thermostats A free hanging cable swinging due to air currents will also generate erratic signals Manipulate electrode cable and connections to check for intermittent continuity Replace as necessary Check to see if the ground wire is connected properly at the pre amp junction box Check for continuity between the stainless steel lug on the electrode and the Ground loop F ground wire at the interface problem Temperature is incorrect Check an isolated sample Place the probe in a beaker filled with water If the probe reads fine in the beaker but not in the stream connect the pre amp ground directly to the earth ground See Temperature symptom in this table No response to pH change Cracked glass bulb If the electrode gives readings between 5 8 and 6 2 pH in all solutions inspect the glass bulb If damaged discard Short circuit High impedance bridge If a constant reading of 7 0 pH or 0 0 mV is obtained insp
74. al communication handshaking For the meter to identify an RS232 connection from an outside source and to keep the RS232 hardware active once communicating the Data Terminal Equipment DTE must assert and hold high the DTR line of the DB9 connector DSR of meter The 950 Flow Meter does not support RTS CTS hardware handshaking Note that DTE must be capable of handling a 12 second maximum response lag Pin Description Pin Description Pin Description Pin 1 Data Carrier Detect DCD Pin 4 Data Terminal Ready DTR Pin 7 Request to Send RTS Pin 2 Received Data RD Pin 5 Signal Ground SG Pin 8 Clear to Send CTS Pin 3 Transmitted Data TD Pin 6 Data Set Ready DSR Pin 9 Ring Indicator 1 Not used E 10 Complications with Floating Point Values The manufacturer s implementation of the Modbus protocol was based on the idea that we would enable our flow meters to emulate a Modicon Compact 984 PLC Consequently we follow the exact same format that Modicon uses for the storing and processing of floating point numbers Additionally the Modbus protocol does not define how floating point values are packed stored into the internal memory addresses or Registers of the flow meter If you are integrating our Modbus capable flow meters be aware that these meters store and process floating point numbers in the exact same format as the Modicon Compact 984 PLC All current models of Modicon PLCs including the Compact 984
75. and their use In the U S A call 1 800 635 1230 Outside the U S A and Europe send E mail to hachflowservice hach com or call 1 301 874 5599 Authorization must be obtained from Hach Company before sending any items for repair To send the monitor to the factory for repair 1 Identify the serial number of the monitor unit 2 Record the reason for return 3 Call the Customer Service Department 1 800 368 2723 and get a Service Request Number SRN and shipping label 4 Use the shipping label provided and ship the equipment in the original packaging if possible Note Do not ship manuals computer cables or other parts with the unit unless they are required for repair 85 Contact Information for U S A and Outside Europe 86 5 Make sure the equipment is free from foreign debris and is clean and dry before shipping Sensors returned without cleaning will be charged a fee 6 Write the SRN number on the shipping box 7 Make sure that all return shipments are insured 8 Address all shipments to Hach Company 5600 Lindbergh Drive North Dock Loveland Colorado 80539 0389 U S A Attn SRN XXX Section 11 Contact information for Europe For technical support repair service and ordering information please refer to the contact information below For all countries except France Spain and Great Britain Flow Tronic RUE J H COOL 19a B 4840 Welkenraedt Belgium Ph 32 87 899797 or 899799 Fx 32 87 89979
76. antages Liquid Depth calibration is the recommended calibration method Use the sensor height method only when Liquid Depth calibration is not an option An Invisible Range can also be set which allows the transducer to ignore reflections from obstructions between the sensor and the water surface such as ladder rungs channel side walls etc 1 From the Main Menu select OPTIONS ADVANCED OPTIONS 2 Highlight Calibration using the UP and DOWN soft keys Press SELECT 3 Highlight Ultra Sonic Sensor using the UP and DOWN soft keys Press SELECT to continue 4 Highlight Calibrate U Sonic Sensor and press SELECT Select the type of ultrasonic transducer In Pipe using the CHANGE CHOICE soft key 6 Press ACCEPT to continue Sensor Installation 7 Enter the ambient air temperature at the transducer location For optimum results allow enough time 100 minutes to ensure that the sensor is at equilibrium with the surrounding ambient temperature The speed of sound in air varies with the temperature of the air The ultrasonic sensor is equipped with temperature compensation to help eliminate the effect of temperature variation under normal site conditions 8 Press ACCEPT to continue Liquid Depth Liquid depth requires knowing the level or depth of the liquid in the channel that is contributing to flow Liquid depth calibration is the recommended calibration method for the in pipe ultrasonic sensor Continue from Step 8 ab
77. arine battery or vehicle cigarette lighter connection Refer to Batteries and Chargers on page 133 for more information Although the 950 Flow Meter will operate on any attached 12 VDC power supply the instrument will assume it is battery operated if it detects a less than 14 2 VDC input and will assume it is operating on an ac power converter if it detects a greater than 14 2 VDC input Table2 12 VDC Connector Pin Assignments Pin Signal Description A Ground B 12 to 17 VDC unregulated 25 Controller Installation 4 7 Sampler 4 7 1 Sampler Connections The sampler interface receptacle is used to connect a wastewater sampler to the 950 Flow Meter Table3 Sampler Connector Pin Assignments Pin Signal Description Wire Color Purpose Rating A 12 VDC input only orange Pin A may receive power from an external device 500 mA 12 VDC w battery max load to 17 VDC pulse B ground brown Pin B provides the ground line that is used in conjunction with w ac power pack the other signals on the connector 500 mA max Used in with Pin B to signal a sampler that a pre determined 12 VDC w battery C flow pulse output yellow to 17 VDC pulse amount of flow has accumulated with a 500 ms pulse w ac power pack Used to wake up a waste water sampler when a set point condition is met so that it can begin its sampling program Configure the flow meter for this pin in D sampler start black Set Poin
78. astae Pas dut due 83 Section 10 Contact Information for U S A and Outside Europe 85 Section 11 Contact information for Europe sssssssssseseeeeneenns 87 Appendix A Program Flow Charts ssssessssssssssssssseeeeerene enne 89 Appendix B Programming Features sse 95 Appendix C Primary Devices amp Head Measurement Locations 109 Appendix D Programming Worksheet ssssssssseeeee eee 113 Appendix E SCADA Modbus System Guidelines sesessseeeeee 117 Appendix F Batteries and Chargers ssssssssssssssseeeeeeeeeene nnne 133 Appendix G Troubleshooting sssssssssssssssseeeeeeeneeenee nennen nnne 137 Appendix H Manning Roughness Coefficients sss 143 Appendix Engineering Drawings sse 145 Table of Contents Section1 Safety Precautions Please read this entire manual before unpacking setting up or operating this instrument Pay particular attention to all danger and caution statements Failure to do so could result in serious injury to the operator or damage to the equipment Do not use or install this equipment in any manner other than that which is specified in this manual 1 1 Use of Hazard Information If multiple hazards exist this manual will use the signal wor
79. atch that of the Master device Set the baud rate of the 950 to match that of the Modbus master device Yes odl ON Continued on sheet 3 d Ne z 128 This section does not apply to Modem Communications SCADA Modbus System Guidelines 950 SCADA Modbus No Response Troubleshooting Flow Chart 3 of 5 Continued from sheet 2 Change the Modbus Does the device address of the address of the Modbus 950 in the message correspond to Communications he address assigned to Setup menu of the the 950 950 Disable the handshaking in the Master device and or Is the Yes jumper out the meter responding handshaking terminals in now the RS232 cable Does the Master device use hardware or software handshaking Congratulations You ve fixed it NQ No Are the correct number of registers being requested for the data type being returned To ensure the integrity of the data being returned the 950 checks to make sure the number of registers being requested coincides with the data type being returned If there are inconsistencies the meter will ignore the polling message For example Floating point data requires 2 registers per value Enumerated and Integer data requires 1 register per value Long integers require two registers per value The meter would ignore a re
80. battery 4 A Hr rechargeable Ni Cad battery Power Options Non rechargeable alkaline lantern batteries 2 x 6VDC 15Vdc supplied from one of 100 120VAC input power supply 230VAC input power supply Back lit liquid crystal display LCD auto off when not in use under battery operation Graphics Display 8 line x 40 character in text mode 60 x 240 pixels in graphics mode 21 position sealed membrane switch with blinking green LED to indicate power on Four soft Keypad keys functions defined by display Totalizers 8 digit resettable and 8 digit non resettable software Time Base Accuracy 0 007 per day Flumes Parshall Palmer Bowlus Leopold Lagco H HL HS Trapezoidal Weirs V notch 22 5 to 120 degrees Compound V Notch Contracted Non Contracted rectangular ThelMar Cipolletti Manning Equation Round U Rectangular and Trapezoidal Channels Flow Nozzle California Pipe Head vs Flow Custom programmable curve of up to 99 points Level only Inches feet centimeters meters Area Velocity Level area table Circular pipe U shaped channel Trapezoidal channel Rectangular channel Measurement Modes ny n Power Equation Q K H K5H Smart dynamic memory allocation automatically partitions memory to provide the maximum logging time No manual memory partitioning required Memory Mode Either slate or wrap around may be selected Data Points Approximately 20 000 standard Expandable up to 11
81. bus communications protocol with the RS232 interface or Modem as described later in this section Figure 12 Communication Capabilities Modem Pager Communication Alarm Pagers CC om p Baa Direct Cable Communication Data Transfer Unit 950 Flow Meter Printer 8 1 RS232 Setup 8 1 1 RS232 Connections Note All interface receptacles are covered with push on caps These caps are designed to protect the connector pins from dirt and moisture and should be attached to any receptacle not in use The RS232 connector is a serial input output port for communicating with the flow meter from an external device such as a DTU or direct serial connection to a PC running data management software This serial interface can also be used for the SCADA Modbus interface See Appendix E on page 117 This port may be configured to communicate at 1200 2400 4800 9600 or 19200 baud Cable Required RS232 Flow Meter to PC Cable Assembly 3 0 m 10 ft long 6 pin connector on one end 9 pin D type connector on the other end P N 1727 9 pin to 25 pin D type adapter included 61 Communications Setup Table 22 RS232 Connector Pin Assignments Pin Signal Description Wire Color A not used white B ground blue C DSR yellow D RCD black E DTR red F TXD green Figure 13 PC to Flow Meter Cable Connection 1 Flow Meter to PC Cable P N 1
82. c board detects an error RS485 Timed Out 13 Comm problems with RS485 14 Reserved for Sampler 15 Reserved for Sampler Low Bubbler Pres 16 Possible leak in bubble tank Clogged Bubbler 17 Bubbler tube is plugged High Level 18 High Flow 19 High Flow Rate of Chg 20 High pH ORP 21 High Process Temperature 22 High Rainfall 23 High CH1 24 High CH2 25 High CH3 26 High CH4 27 High CH5 28 High CH6 29 High CH7 30 66 Communications Setup Table 24 Pager Alarm Codes continued Alarm Code Reason High Reference Temperature 31 High D O 33 High Conductivity 35 Low Level 37 Low pH ORP 39 Low CH1 41 Low CH3 43 Low CH5 45 Low CH7 47 Low Velocity 49 Low D O Temp 51 Low Cond Temp 53 8 2 3 3 Entering the Phone Number of the Remote Computer If the pager option is disabled the 950 Flow Meter can be configured to call a remote computer when an alarm condition has been met Enter the phone number of the remote computer to be called when the alarm condition is met This same phone number will be used for all other alarms If the phone number is long distance be sure to enter a 1 and the area code as well After entering the phone number press ACCEPT 8 2 3 4 Choosing the Dial Method Tone or Pulse Press the CHANGE CHOICE soft key until the correct dial method pulse to
83. cartridge contains one membrane The membrane is located in the threaded fitting at the top of the cartridge If these membranes are any other color then white replace the membrane 9 2 Upgrades Repairs General Maintenance Only a qualified technician should service the 950 Flow Meter For example steps that require knowledge of CMOS electrostatic discharge precautions and advanced electronics training should be performed only by a qualified technician If you need assistance in performing any of the following service steps please contact the manufacturer A Electrostatic Discharge ESD Considerations To minimize hazards and ESD risks maintenance procedures not requiring power to the analyzer should be performed with power removed 76 Delicate internal electronic components can be damaged by static electricity resulting in degraded instrument performance or eventual failure The manufacturer recommends taking the following steps to prevent ESD damage to your instrument e Before touching any instrument electronic components such as printed circuit cards and the components on them discharge static electricity from your body This can be Maintenance accomplished by touching an earth grounded metal surface such as the chassis of an instrument or a metal conduit or pipe To reduce static build up avoid excessive movement Transport static sensitive components in anti static containers or packaging To discharge static
84. cated on the junction box 6 6 1 2 Routing the Bubbler Line There are several important things to consider when routing the bubbler line Route the tubing so that it slopes downward from the flow meter or sensor cable to the flow stream whenever possible This assures that any condensation that forms in the tubing will drain out of the tube If moisture collects in a low spot in the tubing it could restrict the flow of air and cause erroneous readings Don t use more bubbler line than you need Remove excess coils of tubing to decrease the likelihood of moisture problems cuts or kinks 49 Sensor Installation e Use a single continuous length with no spliced connections to eliminate the possibility of air leaks e Use care not to cut or kink the tubing during installation 6 6 2 Bubbler Installation 6 6 2 1 Installation Guidelines e Locate the end of the bubbler line at the proper head measurement point for that primary device All weirs and flumes either come equipped or can be retrofitted with a connection for the bubbler line Stainless steel bubbler line extensions are available where no provisions have been made Optional mounting bands with built in bubbler tube connections for use in round channels are also available e Place the end of the bubbler perpendicular at a right angle to the flow stream e Locate the end of the bubbler line 2 5 to 5 cm 1 to 2 in below the lowest expected level in the channel Pressing the
85. connector ports are located on the left side of the flow meter case The 950 Flow Meter comes standard with three interface ports e 12 VDC Power Input e RS232 Serial Communications Port See section 8 1 on page 61 for connection and programming details e Sampler Automatic Liquid Sampler Control In addition the flow meter can be connected to a wide variety of optional peripheral devices e Rain Gauge section 7 1 on page 53 e Modem section 8 2 1 on page 63 e pH section 7 2 on page 54 e Analog Inputs section 8 3 2 on page 70 e ORP section 7 3 on page 55 e Alarm Relays section 8 4 1 on page 72 e Dissolved Oxygen section 7 4 on page 56 e 4 20 mA Current Loop section 8 3 1 on page 68 e Conductivity section 7 5 on page 58 One or a combination of up to three sensors can be connected to the 950 Flow Meter depending on the system configuration e Downlook Ultrasonic Depth Sensor section 6 1 on page 37 n Pipe Zero Deadband Ultrasonic Depth Sensor section 6 2 on page 40 e Submerged Area Velocity Sensor section 6 3 on page 42 e Low Profile Velocity Only Sensor section 6 4 on page 45 e Submerged Depth Only Sensor section 6 5 on page 46 e Bubbler Depth or Bubbler Area Velocity Sensor section 6 6 on page 48 4 6 12 VDC Connections This connection supplies power to the flow meter Power sources include a battery Ni Cad or Lead Acid an ac power pack or an external source such as a deep cycle m
86. d Danger Caution Note corresponding to the greatest hazard DANGER Indicates a potentially or imminently hazardous situation which if not avoided could result in death or serious injury CAUTION Indicates a potentially hazardous situation that may result in minor or moderate injury NOTE Information that requires special emphasis 1 1 1 Precautionary Labels Read all labels and tags attached to the instrument Personal injury or damage to the instrument could occur if not observed This symbol if noted on the instrument references the instruction manual for operation and or safety information Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after 12 August of 2005 In conformity with European local and national regulations EU Directive 2002 96 EC European electrical equipment users must now return old or end of life equipment to the Producer for disposal at no charge to the user Note For return for recycling please contact the equipment producer or supplier for instructions on how to return end of life equipment producer supplied electrical accessories and all auxiliary items for proper disposal This symbol when noted on a product enclosure or barrier indicates that a risk of electrical shock and or electrocution exists and indicates that only individuals qualified to work with hazardous voltages should open the enclosure or remove the barrier This symbol
87. d Oxygen Probe Temperature Programming eene 57 7 4 4 Dissolved Oxygen Probe Calibration e eee 57 7 9 Conductivity Probe decirte torti ee era Rr t e vai dscbutled ade naut RR CR M e epus 58 7 5 1 Conductivity Probe Connection sucio codo adc cte euet riter dur despsetup dtp ueda Das odt n edt inesse tienaa 58 7 5 2 Conductivity Probe Programming rre eeu eeepc Re p eR REA BU FRR EE HERE CARCER E 58 7 5 8 Conductivity Temperature Programming nennen enini nitentes 58 7 5 4 Conductivity Probe Calibration rr ere aeree AED and Fe RR ERE Rte ieee 59 Section 8 Communications Setup sssssssssssssssseeeeeenre enne 61 Baur fesass S CUI usto taper tate cer cd Uer nte EAE fi EU sce D ER E Ed 61 8 127 RS232 CONNECUONS C 61 Oy lad RS232 PTOGIOFTIDOH DI ie ncs soleos ctu onto ets Mei steed edm ette ttt edu feo inea reete hep A ONES Eae ESTA 62 LAM eroi M Sade tesla cas se eee ds Ae wate cada scence glen ced ta avy aoc oc cele eee 63 8 2 1 Modem Connection ss oio ch setae cei di dual eut Penn Sd paie wc aaa nth one tenet el ale fe 63 8 2 2 Modem Prograrming iota ter nce ERR bula e A D a detta tnu bee Red Mert 63 8 2 3 Modem ODtIOnS a con ete crt er pr d e c be ei i d d aig d Le LIRE SRM Ee HERR Da e Surge 64 8 2 3 T Pager ODUOIG sueco tata inta eta tees aita d e at ER ebd 64 8 2 3 2 Reporting Devices ene ep er ete eite a teo de
88. d amount of flow has occurred Press ACCEPT Controller Installation 4 8 Installation Requirements for CE Marked 950 Flow Meter Models Sigma 950 Flow Meters bearing a CE mark have special use and installation requirements that are subject to the European Union s Notified Body use limitations as indicated below Only the 950 flow meter models part numbers and options listed below are approved for use in the EU under Hach s CE marking scope Description iiid 950 Combination Flow Meter with both AV Bubbler Sensors 3248 950 Flow Meter with AV Sensors only 3522 950 Flow Meter with Bubbler Sensors only 2672 AV Sensor Options xx xxx 7 depth range fill option and cable length T T OXX Xxx Bubbler Sensor Options xxx cable lengths 88007 xxx pH Sensors with 7 6 m 25 ft cable length 3328 pH Sensors with 15 2 m 50 ft cable length 5172 4 20mA output option 2684 12VDC Battery Option 1414 230V 50Hz Battery Eliminator with Continental EU plug 5721400 230V 50Hz Battery Eliminator with UK plug 6244500 230V 50Hz Battery Eliminator with Italian plug 6244600 The use and location restrictions below apply e The Sigma 950 Flow Meter is approved for use in the EU only when placed underground in sewers drain pipes and similar underground locations e The 950 Flow Meter shall be connected only to an AC Mains source that is dedicated to underground service The mains service must not feed any resid
89. demand Velocity Measurement Method Doppler ultrasonic Transducer Type Twin 1 MHz piezoelectric crystals Range 1 52 to 6 10 m s 5 to 20 ft s Zero Stability 0 015 m s 0 05 ft s Accuracy 2 of reading Typical Minimum Depth 2 cm 0 8 in Operating Temperature 18 to 60 C 0 to 140 F 1 12 x 3 81 x 6 86 cm 0 44 x 1 5 x 2 7 in Dimensions 1 For temperatures above 40 C 104 F add 0 3 cm C 0 03 in F 15 Specifications 16 Section 3 Introduction 3 1 Measurement Capabilities The 950 Flow Meter is a portable flow meter that is completely self contained With its rugged construction the meter is completely sealed even with the door open Conforming to NEMA 4X 6 standards the meter also withstands submersion and corrosive gases again with its door open As a result access to the meter s keypad is no problem in manholes rain and other harsh weather conditions The 950 Flow Meter is suitable for measuring and recording flow in open channels full pipes and surcharged lines The 950 Flow Meter is most often used to measure flow in conjunction with a primary measuring device flume weir pipe etc that has a known level to flow relationship The 950 Flow Meter directly measures the level of liquid in a channel that is contributing to flow referred to as head and calculates the flow rate based on the head to flow relationship of the primary device The
90. device choices see Table 6 Table 7 Table 8 and Table 9 Show the size and details required for each Press ACCEPT to continue to Program Lock 11 00 AM 21 APR 01 PRIMARY DEVICE CHANGE ACCEPT CHOICE PRIMARY DEVICE WEIR SELECT PRIMARY DEVICE Table 6 Primary Device Choices Primary Device Description None Level Only No primary device installed Level measurement only Compound Cipolletti Contracted rectangular Non contracted rectangular ThelMar V Notch 22 5 120 Welk Compound V Notch See Table 7 Flume Parshall Trapezoidal H type HL type HS type Leopold Lagco Palmer Bowlus See Table 8 Nozzle California pipe Enter variables K4 K2 ny and ng _ nl K H02 Power Equation lt 0 9999 99 K gt 0 9999 99 nl and n X1 9 99 Two independent user entered look up tables of up to 99 points each Head vs Flow Enter up to two tables of up to 100 user defined head vs flow points Head 0 99 99 in feet or centimeters Flow 0 99999 99 in any desired units Rectangular channel U shaped trapezoidal channel or Circular pipe Enter pipe diameter slope amp roughness coefficient Pipe dia 4 240 in or 101 6096 cm Manning Equation Percent Slope 0 001 1 00 1 unit per hundred units 0 01 slope Example 1 m of decline every 100 m 0 01 slope Manning Roughness Circular Pipe Enter pipe dia 4 240 in 10 610 cm Rectangular Channel Enter width 4 999 99
91. e s Head Measurement Location Head Measurement H Flume Section 3 2 11D peaa 0 ff lt 19D lt 1050 438D 110 END VIEW Primary Devices amp Head Measurement Locations Figure 32 Weir s Head Measurement Location Weir Drawdown Me ee ent Submerged Probe oint H Max Head Q4 Fow Weir Minimum Crest Height 2H Figure 33 Probe and Band Orientation in a Round Pipe Round Pipes Mounting Band with Submerged 111 Primary Devices amp Head Measurement Locations 112 Appendix D Programming Worksheet Name Date Serial No ID No Program Software Versions for Flow Meter DTU InSight Flo Center Basic Programming Guidelines e Go through all Setup menu items and configure each e Next review the items in the Advanced Options menu and configure any items needed e Always check Data Logging and Totalizer Setup Data logging channels must be enabled if you want to record the data in memory Also the totalizer should be configured with an acceptable scaling factor for the flow rate at each site e Go to the options menu and set the time and date if not already set e When finished press the RUN STOP key to start the program e Photocopy the following worksheets to record your program settings at each site for easy reference SETUP MENU From the Main Menu select SETUP MODIFY ALL ITEMS 1 Select FLOW unit of measure gps
92. e 68 for wiring and configuration 7 4 1 Dissolved Oxygen Probe Connection The pre amp P N 3369 or 3212 is required Plug the probe into the pre amp and plug the pre amp into the 950 flow meter Table 19 Dissolved Oxygen Connector Pin Assignments Pin Signal Description Wire Color A 12 VDC white B signal ground blue C input 1 4 20 mA DC yellow D input 2 4 20 mA DC black E input 3 4 20 mA DC red F dissolved oxygen green G dissolved oxygen temp probe gray H conductivity brown J conductivity temp probe purple K not used orange 7 4 2 Dissolved Oxygen Probe Programming 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS DATALOG 2 Highlight Select Inputs using the UP and DOWN soft keys and then press SELECT 3 Highlight D O using the UP and DOWN soft keys then press SELECT 4 Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT 5 Enter a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar along the bottom edge of the display 6 Press CHANGE CHOICE to select the appropriate units ppm ppb mg L sat Press ACCEPT to continue 56 7 Optional Device Installation Select another channel to configure or press RETURN to back up one step Press the MAIN MENU function key to return to the Main Menu 7 4 3 Dissolved Oxygen Probe Temperature Programming 1 2 F
93. e flow meter following a calibration a Place the sensor under at least 16 cm 6 in of water in a horizontal orientation Make sure the sensor is stable and not moving around Press ACCEPT to continue b Measure the depth from the bottom of the bucket to the surface of the water D1 Figure 10 and enter the value using the numeric keypad Press ACCEPT to continue Figure 10 Measuring Submerged Depth Horizontal Orientation JB The 950 Bubbler Flow Meter utilizes the bubbler method of level measurement A length of tubing is placed in the flow stream at the proper location for head measurement A small amount of air is continuously pushed through the tubing and bubbles slowly come out the end The pressure in the tubing changes in proportion to the liquid level in the flow stream The 950 Flow Meter reads the this pressure and converts it to a level reading The 950 Flow Meter will accurately measure the level in the channel as long as the end of bubbler line remains below the zero level point of the channel After measuring the level the 950 microprocessor converts the level reading to a flow rate based on the user defined characteristics of a primary device 6 6 1 Bubbler Connections Note Note To connect a level only bubbler push the 1 8 I D vinyl tubing P N3807 onto the bubbler line port and the other tubing end in the flow stream The Depth Only and bubbler Area Velocity Sensor connector bubbler line connection and
94. e for any tight bends that may cause a kink in the line Replace with new desiccant The desiccant is blue and no change in depth readings Improper flume installation Walls include bows or bends Remove the tube connecting the desiccant cartridge to the reference port on the side of the meter If the depth readings return to normal the desiccant cartridge is plugged Carefully remove the desiccant end caps and check the air intake area for debris Make sure the membrane is not coated with grease Reinstall the flume in a more appropriate site location Incorrect depth on the AV meter Adjust the depth Turbulence The turbulence should be at least 5 pipe diameters behind the sensor and 10 diameters in front For greatest accuracy it should be a smooth laminar flow near the sensor Inaccurate Bubbler Depth Readings Bubbler needs to be calibrated Calibrate the Bubbler Tubing is plugged Use the purge line in the options menu to clear line Decrease the time for auto purge to 10 minutes Also clean out the bubble line with 40 to 50 psi of compressed air or replace the bubble line 138 Troubleshooting Troubleshooting the Submerged Area Velocity Sensor Problem Cause Solution CPU board is having trouble communicating Wall afew minutes and see it the coridition disappears If it continues there is a problem with the RS485 Time with the velocity board Out Unit
95. e or press RETURN to back up one step Table 37 Setup Parameters for Specific Channels Channel Name Configuration Options Process Temperature 1 Select Logged or Not Logged using the CHANGE CHOICE soft key 2 Press the ACCEPT soft key to continue 3 Enter the Logging Interval using the numeric keypad 4 Select Temperature Units F or C this is the only place where temp units can be changed Rainfall section 7 1 2 on page 53 pH ORP section 7 2 2 on page 54 and section 7 3 2 on page 55 Level Flow Flow Units on page 29 and Level Units on page 30 Analog Inputs section 8 3 2 2 on page 71 B 15 Diagnostics From the Main Menu select OPTIONS ADVANCED OPTIONS DIAGNOSTICS In addition to the automatic diagnostics that are performed upon power up a keypad test LCD test demonstration graph velocity analysis and events log are available 101 Programming Features B 15 1 Keypad Test B 15 2 LCD Test Keypad Test provides a simple means of verifying the operation of all front panel keys Selecting KEYPAD TEST from the diagnostics menu will bring up the following screen 11 00 AM 21 APR 01 QUIT KEY PRESSED 5 PRESS ANY KEY Pressing any key on the front panel except for the upper left soft key will cause that key label to appear in the center of the display All numeric keypad keys soft keys and function keys may be tested in this manner To end press QUIT this a
96. e sent to These numbers are usually provided when the pager is purchased Press ACCEPT 11 00 AM 21 APR 01 MODEM SETUP CHANGE ACCEPT PAGER 1 CHOICE PHONE NUMBER 555 5555 CANCEL CHOICES ENABLED DISABLED 8 2 3 2 Reporting Devices You have the choice of which communication devices will report and in what order Choices are MODEM ONLY PAGER ONLY PAGER THEN MODEM and MODEM THEN PAGER 65 Communications Setup 1 Press CHANGE CHOICE until the desired reporting method is displayed then press ACCEPT 11 00 AM 21 APR 01 MODEM SETUP CHANGE ACCEPT REPORTING ORDER CHOICE PAGER THAN MODEM CANCEL CHOICES MODEM AND OR PAGER 2 When the 950 Flow Meter calls the pager service it will transmit a Pager Alarm Code number see Table 24 which corresponds to a specific alarm condition Table 24 Pager Alarm Codes Alarm Code Reason Low Main Battery 1 Battery pack is less than 11 5 V Memory Battery 2 Internal memory battery is low Low Slate Memory 3 Less than 10 slate memory left Slate Memory Full 4 Slate memory is used up 6 Reserved for Sampler 7 Reserved for Sampler 8 Reserved for Sampler 9 Reserved for Sampler Low Main Battery 1 Battery pack is less than 11 5 V U Sonic Echo Loss 10 No return signal detected Xducer Ringing 11 The return signal is detected too soon U Sonic failure 12 Ultrasoni
97. e spoon ea de todas 65 8 2 3 3 Entering the Phone Number of the Remote Computer 67 8 2 3 4 Choosing the Dial Method Tone or Pulse ssseemR 67 9 3 Arialog GComtrinicallorts 25 3 eid eI el US etica deo exe Pete ra rx Rte e Deu mu dee be 68 98 3 174 20 MAL OULD Ub ses rennes ere E re re etr eee test eae ens dra reel Ee ERES 68 9 3 1 1 4 20 MA GODIDSQUOTIS s is Nec fere ec ree p ane reto B adio D Pee Cu utu 68 8 3 1 2 Programming the 4 20 MA Output essere 68 8 3 1 3 Calibrating the 4 20 MA Output a 2 dci miscetur te dedere dri gerit vt oth qe exacte 69 Rc PEE lesMige lcs M sahsi 70 9 2 2 1 Analog Voltage INPUTS suede tags e ce RR tont bow cadena D Ca eet 70 Table of Contents 8 3 2 2 Analog Voltage Inputs Programming eesn en 71 LIE aJ p 72 8 4 1 Alarm Relay Connections ied nod ccrte dt cen cep odora aia ayana Eiaa Secus in iac tees 72 8 4 2 Alarm Relays Progra ring ns acc cnet at tag Saar M ed anaes t vae bis Let ndo nac tope Rai inea ie RS 73 9 4 2 1 Trouble ALANS errante ot rre ope tp dee ede teuer a ter dE ees 73 8 4 22 Set POI AIGITUS cocto e re xli de Zann cong danke sa Ete pee EEEak NEA anse ES 74 Section 9 Mainten ance eet d ate teal ua e re e EU t SLM eid 75 9 1 Routine MaInterfaribi uou a do t eoe dade deg sae lander toi t d oe oet oe e Spb apibus seu coca dee paaie 75 NEU M s
98. e ultrasonic sensor receptacle is on the left side of the flow meter and labeled Ultrasonic The connector is keyed and can only be inserted key up Table 11 Downlooking Ultrasonic Depth Sensor Connector Pin Assignments Pin Signal Description Wire Color A temperature red B temperature black C ultrasonic shield D ultrasonic clear Note Cutting or splicing the sensor cable may cause instrument malfunction and void the warranty Remote Ultrasonic Connection A Remote Ultrasonic factory installed Option is available P N 3170 which allows for the extension of the ultrasonic sensor cable see Figure 5 6 1 2 Downlooking Ultrasonic Depth Sensor Programming The downlooking ultrasonic depth sensor does not require specific programming unless more than one sensor option is connected to the meter When more than one sensor option is connected 1 From the Main Menu select OPTIONS gt LEVEL SENSOR Select Ultra Sonic using the CHANGE CHOICE soft key then press the ACCEPT soft key 37 Sensor Installation Figure 5 Remote Ultrasonic Sensor Option 1 Enclosure 13 97 x 22 86 x 4 0 cm 5 5 x 9 0 x 4 0 in 3 Toflow meter 5 Cable P N 2716 2 Customer supplied conduit to 950 flow meter 4 Cable P N SE 818 6 Ultrasonic Transducer 6 1 3 Downlooking Ultrasonic Depth Sensor Calibration Calibrate the current water depth via one of two methods Liquid Depth or Sensor Height
99. eads to the flow meter using a junction box P N 4730 This junction box is a physical connection point for the sensor wires and breather tubing Refer to Figure 7 for the following procedure 1 Remove the four cover screws cover and cover gasket from the junction box Unscrew the cable clamp hex nut on the box enough to allow insertion of the sensor cable 42 Sensor Installation 2 Insert the sensor cable into the box and make connections Refer to the wiring diagram on the inside cover of the box connect each wire to its corresponding terminal screw observing the wire colors listed in that diagram See Table 13 3 Connect the tubing in the cable to the clear tubing in the box that is already connected to the exit fitting 4 Slip the cable in or out of the box sufficiently to create a slight loop in the wires and tubing to allow strain relief and then tighten the cable clamp hex nut 5 Being careful to align the cover gasket P N 2101 reattach the cover and gasket to the box with the screws 6 Connect clear tubing between the top tubing nipple on the desiccant canister and the brass tubing nipple on the junction box 7 Connect the short connector terminated cable to the velocity connector on the flow meter Figure 7 Junction Box Probe and Cable Connection E B j mE x JT A 0 bv gt E D 2 Y o aN 1 Connect to meter 4 Gasket P N 2101 7 Con
100. eam This is not used for calibration and has no effect on the calibration of the sensor Below are some examples of compensation factors of various liquids 0 96 C 5 Sulfuric Acid 1 88 C Dilute Ammonia 1 91 C Typical Wastewater 1 97 C Potassium Chloride 2 12 C Salt Sodium Chloride 2 84 C 98 Sulfuric Acid 4 55 C Ultra pure Water With the sensor still in the calibration solution press any key Wait for the sensor to stabilize Calculate the actual conductivity of the calibration solution If using the KCI solution provided by the manufacturer make your selection from Table 21 on page 60 If using a solution other than 1 0 mS 25 C KCI available from the manufacturer you must calculate the conductivity of the solution using temperature correction factors See the example below Example The KCI calibration solution is 1 0 mS at 25 C The temperature correction factor for KCI is 1 97 C If the actual temperature of the KCI at the time of calibration is 18 4 C then the solution has a conductivity value of 0 870 mS a Find the difference between the labeled temperature and the actual temperature of the calibration solution at the time of calibration 25 C 18 4 C 6 6 C b Multiply the difference 6 6 by the correction factor per C 1 97 or 0 0197 6 6 C x 0 0197 C 0 13002 c If the calibration temperature is lower than the labeled value then subtract that value from the sta
101. eck to see if the unit is calibrated Re calibrate the sensor 139 Troubleshooting Troubleshooting the Ultrasonic Sensor Problem Cause Solutions RS485 Time Out Did not get a reading with the specified time allotted CPU is having trouble communicating with the Ultrasonic board Wait a few minutes and see if the condition goes away If it continues there may be a problem in the Ultrasonic Velocity or CPU board and you should contact the factory U Sonic Echo Loss Flow Meter Not Receiving a Return Echo from the Ultrasonic Transducer Excessive foam on the water surface cause sound waves to be absorbed rather than reflected Check for excessive foam Sensor is knicked or cut or improperly installed Check for knicks cuts and the sensor installation Sensor must be level for proper return of signals Make sure the ultrasonic transducer is level Convection currents are present which varies the speed of sound Try shielding the transducer from convection currents Echo loss should not exceed more than two hours Temperature calibration set up incorrectly Extreme high or low temperature indicates a bad temperature transducer in the temperature sensor Go through the temperature calibration procedure and determine what temperature the unit is sensing Replace transducer if necessary U Sonic Failure No Signal from the Ultrasonic Transducer Transducer is not
102. ect the cable If no visible damage exists remove the connector and test for a short circuit Replace if faulty Inspect the connector for moisture or corrosion If wet rinse well with distilled water and dry thoroughly Determine the cause of wetness and correct it Temperature is constant or incorrect Electrode won t calibrate Interface is wired wrong Check interface wiring Thermistor is open Gain or offset error Check interface wiring Check for open at electrode RTD wire Disconnect to make measurement Should read approximately 100 110 ohms Ensure that solutions are fresh and labeled properly Confirm that electrode and buffer temperatures have stabilized Confirm that the wetting cap is removed Check bulb for cracks or other damage Confirm that interface wires are connected properly Check interface connections for corrosion 142 Appendix H Manning Roughness Coefficients Closed Conduit Partly Full Metal Steel Lockbar and welded 0 010 0 012 0 014 Riveted and spiral 0 013 0 016 0 017 Cast Iron Coated 0 010 0 013 0 014 Uncoated 0 011 0 014 0 016 Wrought Iron Black 0 012 0 014 0 015 Galvanized 0 013 0 016 0 017 Corrugated Subdrain 0 017 0 019 0 021 Storm drain 0 021 0 024 0 030 Non metal Acrylic 0 008 0 009 0 010 Glass 0 009 0 010 0 013 Wood Stave 0 010 0 012 0 014 Laminated treated 0 015 0 017 0 020 Clay Common drainage tile 0 011 0 013 0 017
103. ed Longer logging intervals result in a longer total recording time Lower resolution also occurs since more averaging is done at higher logging intervals Choose the shortest logging interval possible while still making data collection convenient Pick a logging interval that almost fills memory over the course of one month if data will be collected monthly Table 36 Logging Intervals vs Total Recording Time for Each Memory Configuration With 128K Bytes of RAM With 512K Bytes of RAM Standard Optional Logging Interval approx 17 280 readings approx 115 630 readings Total recording time days before memory is full 1 12 80 2 24 160 3 36 240 5 60 401 6 72 481 10 120 803 12 144 963 15 180 1204 20 240 1606 30 360 2409 60 720 4818 1 Assuming one logged channel B 13 Data Logging Memory Allocation Options 100 The Sigma 950 Flow Meter uses a management scheme called Dynamic Memory Allocation All readings are logged in battery backed Random Access Memory RAM RAM memory is allocated to each channel dynamically during operation If one channel is logging at 5 minute intervals and a second channel is logging at 1 minute intervals the meter automatically configures memory so that both channels fill memory at the same Programming Features time Five times as much memory is assigned to the channel that is logging at 1 minute intervals than the channel
104. ed to power external analog devices B ground Used in conjunction with any or all the input blue signals on Pins C J C input 1 0 20 mA DC yellow D input 2 0 20 mA DC 0 20 mA DC inputs for Channels 1 through 3 black E input 3 0 20 mA DC red F input 4 4 to 4 VDC green G input 5 4 to 4 VDC gray 4 to 4 VDC inputs for Channels 4 7 H input 6 4 to 4 VDC brown J input 7 4 to 4 VDC purple K not used N A orange 1 If the DO Conductivity options was purchased only three additional inputs are available Pins C D and E Cable Required Analog Input Cable Assembly 25 ft 7 6 m 10 pin connector on one end tinned wire leads on the other end P N 2706 8 3 2 2 Analog Voltage Inputs Programming To map an external device to an analog input channel Select an analog input channel 1 2 and 3 are current inputs and 4 through 7 are voltage inputs 1 Select DATA LOG from the Advanced Options menu 2 Highlight SELECT INPUTS using the UP and DOWN keys Press SELECT Note A channel with logging enabled will have an arrow in front of it to signify that the channel is logged 3 Highlight the analog channel to log using the UP and DOWN keys then press SELECT 4 Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT Enter a Logging Interval Select Unit of measurement ppm ppb afd cfs cfm cfd cms cmm cmh cmd gps gpm gph Ips lpm Iph or mgd 7 Enter Low Poin
105. eers detaneneys 5 9 1 2 Cleaning ANS Case cn oi e atu t Dette taney ne utu tie e tocquu cuba ad aes 75 9 1 3 Maintaining Desiccant Cartridges and Desiccant ssssseeeee 76 9 1 91 REPIACING thie DesICOall ai ette ere rnt deduce tp ee bea deor cette dete tee 76 9 1 3 2 Rejuvenating the Desiccant esses esent dn nhan annie me rhe enean 76 9 1 3 3 Maintaining the Hydrophobic Membrane ssssseeeeen 76 9 2 Upgrades Repairs General Maintenance eeeeeeesssssssesessseseee nennen 76 9 2 1 Internal Maintenance Items cipe tee recette e ep ipaue erede enge 77 9 252 REMOVING tie Front Patel estt tec mite rte dp ease cpu rides trf eundi detent Tins 7T 9 2 3 Re Installing the Front Panel er erect ete hedera rele pe c den 78 9 3 Circuit Board IdentufiCallor on cite rte a cage phn piece tttcat oet mtu e One asian tede 79 94 Fuse and Connector Locatioris orn oe ener M ide teta Pane ae a EL de M tuae 79 9 4 1 Fuse Removal and Inspection sse enne rennen 81 9 4 2 Working with Wiring Connectors terme tetur reet sceetuceeseneetsaccuted Cet E aedi Rn De ERE 82 9 5 Replacing the Internal Desiccant Module eese eene teens 82 9 6 Replacing the Internal Case Humidity Indicator Disc eeeee 82 9 7 Memory Ballerles ead eoe age aee toii ostio Ir X X Rony eit ce depre bee doe egal el h
106. elves but should contact the appropriate electric inspection authority or electrician as appropriate DANGER Les utilisateurs ne doivent pas essayer d tablir eux m mes de telles connexions mais doivent contacter l lectricien ou l organisme de v rification lectrique appropri e selon le cas The Load Number LN assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device to prevent overloading The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all the devices does not exceed 100 1 5 Service Requirements In the event of equipment malfunction all repairs should be performed by the manufacturer or an authorized agent It is the responsibility of users requiring service to report the need for service to the manufacturer or to one of our authorized agents Service can be facilitated throughout our office Section 10 on page 85 Section 2 Specifications Specifications are subject to change without notice General Dimensions 34 3 H x 25 4 W x 24 1 cm D 13 5 x 10 0 x 9 5 in Weight 5 kg 11 Ib not including power source Enclosure NEMA 4X 6 with front cover open or closed ABS UV resistant Temperature Storage 40 to 80 C 40 to 176 F Operating 10 to 65 5 C 14 to 150 F 12Vdc supplied from one of 7 A Hr rechargeable gel lead acid
107. ent des informations sous la forme d avertissements messages de prudence et notes qui demandent une attention particuli re Lire et suivre ces instructions attentivement pour viter les risques de blessures des personnes et de d t rioration de l appareil Les t ches d entretien d crites dans cette partie du mode d emploi doivent tre seulement effectu es par le personnel qualifi pour le faire PELIGRO Algunos de los cap tulos del manual que presentamos contienen informaci n muy importante en forma de alertas notas y precauciones a tomar Lea y siga cuidadosamente estas instrucciones a fin de evitar accidentes personales y dafios al instrumento Las tareas de mantenimiento descritas en la presente secci n deber n ser efectuadas nicamente por personas debidamente cualificadas GEFAHR Einige der folgenden Abschnitte dieses Handbuchs enthalten Informationen in Form von Warnungen Vorsichtsmafinahmen oder Anmerkungen die besonders beachtet werden m ssen Lesen und befolgen Sie diese Instruktionen aufmerksam um Verletzungen von Personen oder Sch den am Ger t zu vermeiden In diesem Abschnitt beschriebene Wartungsaufgaben d rfen nur von qualifiziertem Personal durchgef hrt werden PERICOLO Alcune parti di questo manuale contengono informazioni sotto forma d avvertimenti di precauzioni e di osservazioni le quali richiedono una particolare attenzione La preghiamo di leggere attentivamente e di rispettare quelle istruzioni pe
108. ential locations If the 950 Flow Meter is operated in areas where high levels of RF energy or severe electrical transients are present performance related problems can result from electromagnetic interference These conditions are not expected to be present in the types of underground locations indicated above for the 950 Flow Meter use model 27 Controller Installation 28 Section5 Basic Programming Setup 5 1 Initial Power Up of Meter After power is applied the flow meter performs a complete diagnostic self test and displays the menu shown when the unit was last turned off The Main Menu is the starting point for all programming operations The Main Menu offers four choices e Setup Basic programming e Status Lists all currently measured readings e Display Data Shows graphs and tables of logged data See Displaying Data on page 95 e Options Advanced programming Regardless of the current menu displayed pressing the Main Menu function key will bring up the Main Menu screen Setup and Option functions lead to sub menus which configure the basic and advanced features of the flow meter Refer to the 950 Flow Meter Basic Programming Setup on page 87 The Display Data and Status lead to sub menus which provide information only Press the STATUS soft key to display any data channels that have enabled logging flow pH temp etc 11 00 AM 21 APR 01 DISPLAY DATA SETUP OPTIONS STATUS READY TO START 5 2
109. epth Range 0 to 3 m 0 to 10 ft Extended Range 0 to 9 m 0 to 30 ft Maximum Allowable Depth Standard 10 5 m 34 5 ft Extended 31 5 m 103 5 ft Operating Temperature Range 32 to 160 F 0 to 71 C Compensated Temperature Range 32 to 86 F 0 to 30 C Temperature Error 0 005 to 3 5 m 0 0022 m C 0 018 to 11 5 ft 0 004 ft F 0 005 to 10 5 m 0 006 m C 0 018 to 34 6 ft 0 012 ft F maximum error w in compensated temperature range per degree of change Velocity Induced Error on Depth Compensated based on pipe geometry and flow velocity Air Intake Atmospheric pressure reference is desiccant protected Specifications Bubbler Area Velocity Sensor Depth Measurement Method Doppler principle pressure transducer Range 0 003 to 3 6 m 0 01 to 11 75 ft 0 01 to 11 75 ft 0 011 ft 0 033 m linearity and hysteresis at 22 C 72 F Accuracy Ambient Operating Temperature 18 to 63 C 0 to 145 F Compensated Temperature Range 0 to 59 C 32 to 136 F 0 0003 ft F maximum error within Temperature Error compensated temperature range per degree of change Bubble source and reference port desiccant protected Air Intakes Fittings provided for remote intakes Filters 10 micron on bubble source intake Line Purge Bubble line is high pressure purged at programmed intervals or in manual mode on
110. er a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar 6 Select another channel to configure or press RETURN to back up one step Press the MAIN MENU function key to return to the Main Menu 7 2 3 pH Probe Calibration 54 Once the pH probe is connected and programmed calibrate the pH probe Calibrating the pH probe requires a thermometer and any two of the following buffer solutions 4 7 or 10 pH The pH probe is an application sensitive device When used in harsh environments the accuracy and life expectancy of the probe decreases Calibrate the pH probe each time it is cleaned or replaced Regular inspection and comparison to a hand held pH meter can help determine the optimum cleaning and calibration schedule for your application 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt pH 2 Place the pH probe into the first buffer solution Press any key to continue Optional Device Installation 3 Enter the temperature of the first buffer solution using the numeric keypad Press ACCEPT to continue 4 Press the CHANGE CHOICE to select the pH for the first buffer solution 4 7 or 10 pH then press ACCEPT to continue 5 Remove the probe from the first buffer solution rinse it under distilled water and place it into the second buffer solution 4 7 or 10 pH different from the first buffer used Press any key to continue 6
111. erature of Liquid select or Enter pH for Buffer 1 select Place EE 32 to 211 select Place Sensor in Second Buffer Advanced Options Calibration Enter New mV Value select select or Enter New Liquid Temperature Enter pH for Buffer 2 4 20 mA select Select Output A or Output B up Press a key for 4 mA Outputs SEE area OP AIP Output B y select Enter Actual Output Current select Enter New Conductivity Value Conductivity or Conductivity Temp r o Dissolved Oxygen Press a key for 20 mA o o o Q select select Enter Temperature Correction Value Enter Actual Output Current Place Sensor In Liquid select Enter New Temperature Enter Ambient Temperature select Enter Elevation select Enter Membrane Thickness select Dissolved Oxygen Temperature Place Sensor in Liquid 32 to 211 deg F N o o e 2 o o o Q Enter Chlorinity select select Enter New D O Temperature Place Sensor in Air 93 Program Flow Charts 94 Appendix B Programming Features B 1 Review All Items To view programmed entries without changing any of the information select the Review All Items from the Setup menu Use the arrow keys to scroll through the setup information Press the MAIN MENU key to exit REVISION 1 00 FLUME TYPE PALMER BOWLUS FLUME FLUME SIZE 12 in SAMPLER PACING mgd FLOW UNITS gal LEVEL in CHANNE
112. erature range per degree of change Resolution 0 0011 ft Material PVC housing with Buna N acoustical window Cable 4 conductor with integral stainless steel support cable Cable Length Crystal Specification 7 6 m 25 ft standard custom lengths are available 5 beam angle with horn Dimensions 12 7 H x 5 7 cm D 5 0 x 2 25 in Weight 0 7 kg 1 5 Ib In Pipe Zero Deadband Ultrasonic Depth Sensor 75 kHz Accuracy Range 0 038 to 2 4 m 0 003 m 0 125 to 8 ft 0 01 ft at 22 C 72 F still air 40 to 70 relative humidity Distance from sensor to liquid O to 2 4 m 0 to 8 ft Span 0 038 to 4 57 m 0 125 to 15 ft Sensor Certification Resolution USA Class Zone lI Groups A B C D Canada Class Division Groups A B C D Class ll Division Groups E F G 0 019 cm 0 0075 in Ambient Operating Temperature 18 to 60 C 0 04 to 140 F Temperature Error 0 00005 m C 0 0001 ft F maximum error within compensated temperature range per degree of change Material Stat Kon A E ABS Plastic Cable 4 conductor Cable Length 7 6 m 25 ft standard custom lengths up to 305 m 1000 feet using RS485 two wire remote sensor option Crystal Specification 7 beam angle Dimensions transducer only 4 44 cm 1 75 in maximum diameter 31 5 cm 12 4 in long Mounting Dedica
113. ermal sensor damaged Problem with communications between the flow meter and a remote ultrasonic sensor PSRS Timed ut May indicate open thermal sensor Alarm Action s Set Relay 1 Set Relay 2 Set Relay 3 Set Relay 4 Report via Modem 73 Communications Setup 8 4 2 2 Set Point Alarms Set Point Alarms activate when a user definable high and or low set point is reached Set Point Alarms look for trip points to be reached before initiating an action Note The rate of change alarm can be used with any primary device except when the primary device is defined as area velocity 4 Enable one of the alarm conditions level flow rate of change rainfall DO Conductivity Flow pH or Analog Channels 1 7 Select an action to occur when the alarm is activated Set either a High trip point or a Low trip point 7 Enter the deadband value The deadband is the area between the alarm turn on and turn off Refer to Setting the Deadband on page 98 74 Section 9 Maintenance DANGER Some of the following manual sections contain information in the form of warnings cautions and notes that require special attention Read and follow these instructions carefully to avoid personal injury and damage to the instrument Only personnel qualified to do so should conduct the maintenance tasks described in this portion of the manual DANGER Certains des chapitres suivants de ce mode d emploi contienn
114. f efficiency or appreciable deterioration of battery performance Table 49 Lead Acid Battery Storage Recommendations Maximum Recommended Storage Temperature Storage Time 0 to 20 C 12 months 21 to 30 C 9 months 31 to 40 C 5 months 41 to 50 C 2 5 months F 2 Nickel Cadmium Batteries Nickel cadmium batteries provide superior power capabilities when used at low temperatures They also perform a higher number of charge discharge cycles than lead acid batteries 133 Batteries and Chargers Maintenance Nickel cadmium cells are sealed They contain no free electrolyte and in most cases require no service or maintenance other than recharging Charging Charge new nickel cadmium batteries prior to use due to their self discharge rate Nickel cadmium cells are designed to be fully charged using a Hach Company nickel cadmium battery charger within 14 to 16 hours Do not exceed 16 hours or you may damage or shorten the life of the battery The charge rate is 400 mA DC The L E D indicator is on continuously when charging a nickel cadmium battery Storage At room temperature the self discharge rate of nickel cadmium batteries can be as high as 2 per day When charged cells have been stored for a long period of time or at an elevated temperature a change starts to take place in the negative electrode The structure changes so that it is less reactive than a fresh cell This structure will return to normal a
115. f new bubbler tubing from the flow meter to a graduated cylinder filled with at least 16 cm 6 in of water Make sure that the tubing is held securely in the cylinder and cannot move during calibration Note Always recheck the Level Adjust when reinstalling the flow meter following a calibration See Figure 1 on page 18 4 Select CALIBRATE BUBBLER from the Bubbler Calibration menu Carefully measure the depth of the bubbler line with a ruler Measure from the surface of the water to the bottom of the bubbler line ignore the bubble 5 Enter the new depth using the numeric keypad Press ACCEPT The current reading is shown for reference This depth value is always entered in the unit of measure that was selected in the Setup menu inches centimeter etc Auto Purge When enabled Auto Purge will cause a one second high pressure purge of the bubble line on a user defined time interval This purge will clear debris such as silt from around the end of the bubble line and to prompt trouble free and accurate operation even in high solids applications Select AUTO PURGE from the bubbler calibration menu and press CHANGE CHOICE to enable or disable Auto Purge If enable is selected the Auto Purge interval screen is then displayed Enter an interval between 5 and 90 minutes using the numeric keypad then press ACCEPT 51 Sensor Installation 52 Section 7 Optional Device Installation This section describes how to set up a rain gauge
116. flow meter can also measure the average velocity of the flow stream using a submerged Doppler sensor and calculate flow based on the current depth and the Continuity Equation Wetted Area x Velocity Flow In addition to its extensive data logging capabilities the 950 Flow Meter is capable of enabling a sampler pacing a sampler controlling external devices with four Normally Open Normally Closed relays and controlling external devices with two 4 20 mA current outputs Communication capabilities include a standard RS232 port and an optional on board modem used for remote data transfer remote programming and updating internal embedded programs using Flash Memory technology RS232 only The 950 Flow Meter also provides SCADA Communication Interface functionality using the Modbus ASCII protocol This software protocol communicates with the instrument via an RS232 connection Using Hach s integrated sewer system management software users can download remotely program and conduct other data manipulation via RS232 connection or the optional modem 3 2 Front Panel Features and Controls The 950 Flow Meter case has several unique features all designed to simplify installation operation and maintenance The instrument front cover protects the panel controls and display window while providing a clear view of the flow meter status on the display The cover also contains two lockable latches which can be secured with a padlock s for secur
117. fter one or two charge discharge cycles Batteries which have been stored for extended periods of time longer than 1 week should be fully charged prior to use Nickel cadmium cells can be stored for extended periods of time in either a charged or discharged condition without significant degradation in their performance Table 50 However after long storage periods the battery pack may require a few charge discharge cycles to restore its full capacity Table 50 Nickel Cadmium Battery Storage Recommendations Maximum Recommended Storage Temperature Storage Time 20 to 30 C 9 months 30 to 40 C 5 months over 40 C 3 months F 3 Alkaline Lantern Battery Pack 134 The Alkaline Lantern Battery Pack P N 3893 allows customers who are doing long term flow studies or multi site flow studies to use a disposable battery instead of a rechargeable battery This allows you to log data for extended periods of time without having to check the battery or replace it with a charged one The battery pack offers extended operating periods when used in conjunction with 950 Flow Meters Maintenance The Alkaline Lantern Battery Pack requires little to no maintenance because it is not rechargeable and it is completely sealed and watertight The only maintenance required is to replace the internal Alkaline Lantern Batteries when they expire Keep the sealing gasket in the channel along the top of the battery base clean and clear of
118. hannels the frequency of logged channels Logging Interval and explains what to do when the memory becomes full B 12 Logging Intervals Logging Intervals are designed to optimize the available memory so that readings can be logged for a longer period of time A Logging Interval is the time period over which readings are taken and then averaged The Sigma 950 Flow Meter has three data logging modes extended power mode power save mode and continuous mode Extended Power Mode When operating in extended power mode the microprocessor spends most of its time asleep conserving battery power Once per logging interval the flow meter wakes up logs the readings from all enabled input channels performs any other necessary duties required and then goes back to sleep This mode will give the longest battery life but the least resolution If you select one minute logging interval in extended power mode a reading will be taken once per minute at which time a reading is logged If you select a five minute logging interval a reading will be taken once every five minutes at which time that reading is logged Note The Sigma 950 Flow Meter will assume it is battery operated if it measures less than 14 2 volts and DC powered in its power supply Power Save Mode Power save mode is automatically initiated upon power up if a battery is installed on the flow meter When operating in power save mode the microprocessor spends most of its time a
119. hat secures the Hanger over a rung of up to 174 in 4 4 cm in diameter When suspending the flow meter the Manhole Rung Hanger utilizes only the top two threaded mounting inserts leaving the bottom two inserts free Do not use the bottom inserts for suspending any additional equipment The inserts are designed to support only the weight of a 950 Flow Meter and will not adequately support additional weight See Figure 3 on page 24 23 Controller Installation Figure 3 Manhole Rung Hanger 1 Place over ladder rung 2 Connect bottom inserts to meter 4 4 Installing the Power Supply The 950 Flow Meter is designed to accept either the manufacturer s 12 VDC battery pack or ac power converter 1 Place the power supply on the back of the flow meter See Figure 4 2 Pullthe two rubber hold down clamps up and over the clips on each end of the power supply 3 Connect the power supply connector to the port labeled 12 VDC on the top left side of the case Figure 4 Power Supply and Interface Connectors e oos 9 L O q Lo 1 Power Supply 3 12VDC Port 5 Sampler Port 2 Rubber Hold down Clamp 4 RS232Port 24 Controller Installation 4 5 Interface Connector Descriptions Note All interface receptacles are covered with push on caps These caps are designed to protect the connector pins from dirt and moisture and should be attached to any receptacle not in use The interface
120. he Modbus server or MMI must be configured to read these values as Integers If the server or MMI is formatting this data as any data type other than Integer the values will not be read or displayed correctly Different Modbus servers and MMI manufacturers have different methods for configuring the application to the appropriate data type contained within the register Contact the server or MMI manufacturer for details on how to configure the application to read the data in the correct format SCADA Modbus System Guidelines 950 SCADA Modbus No Response Troubleshooting Flow Chart 1 of 5 No response to polling 3 Message x Is the 950 turned on and power applied No Apply power and turn the Meter on by pressing the ON button Yes Is this the first time this meter has ever been used with Modbus No Has the meter worked with Modbus before Yes Determine the flash embedded code version by turning the meter off and then back on again and observing the value on the display Is the flash code version 6 0 or later No f STOP o version 6 0 or later ar e j N compatible with Modbus No nly 950 with flash MAC Turn the 950 off and then turn it back on again This will reset the communications buffer Is the meter i m are now Set the polling device T
121. her replace the dryer tubes P N 5027 replace the desiccant P N 3624 and membrane P N 3390 or rejuvenate the desiccant as described in section 9 1 3 2 Moisture in the reference port and intake lines can damage the mechanical components of the bubbler system Maintaining the desiccant in both dryer tubes will greatly prolong the life of the bubbler system in the 950 Flow Meter 9 1 3 1 Replacing the Desiccant 1 Remove the desiccant cartridges by pulling them out of their clips 2 Remove the end caps and dump out the old desiccant 3 Replace the white hydrophobic filter membrane P N 3390 in each end cap The dull side of the membrane must face into the incoming air flow 4 Pour new desiccant into the tubes and replace the end caps Snap both dryer tubes back into their clips 9 1 3 2 Rejuvenating the Desiccant Remove the beads from the cartridge and heat in an oven at 100 to 180 C 212 to 350 F until the beads turn blue again If the beads do not turn blue replace them with new desiccant 9 1 3 3 Maintaining the Hydrophobic Membrane When checking or changing the desiccant in the external desiccant cartridge check the white hydrophobic filter membrane in the ends of the desiccant cartridges and replace as necessary These membranes keep liquid out of the cartridge while still allowing air into the cartridge If the membrane becomes plugged the flow meter will not read accurately and may display error messages Each
122. ian Industry Canada label identifies certified equipment This certification means that the equipment meets certain telecommunications network protective operational and safety requirements The Department does not guarantee the equipment will operate to the user s satisfaction Before installing this equipment users should ensure that it is permissible to be connected to the facilities of the local telecommunications company The equipment must also be installed using an acceptable method of connection In some cases the company s inside wiring associated with a single line individual service may be extended by means of a certified connector assembly telephone extension cord The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment Safety Precautions Users should ensure for their own protection that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particularly important in rural areas CAUTION Users should not attempt to make such connections thems
123. ible damage Contact Hach Customer Service at 1 800 368 2723 if any items are missing or damaged 4 2 Choosing the Proper Site The accuracy of your flow measurements greatly depends on the suitability of your monitoring site Select sites that have normalized flow and minimal turbulence Turbulence can make it difficult to detect an average velocity in the flow stream Obstructions vertical drops pipe bends and elbows can create turbulence and affect the accuracy of your measurements Table 1 contains suggestions for preventing turbulence Table 1 Suggestions for Preventing Turbulence Site Condition Suggested Remedy Outfalls Place the sensor in at least ten times the maximum expected level upstream of the outfall Vertical drops in the channel floor Place the sensor in at least ten times the maximum expected level upstream of the vertical drop Place the sensor in at least ten times the maximum expected level downstream of the vertical drop Elbows sharp turns and Y connections Place the sensor in at least ten times the maximum expected level upstream of the impediment Place the sensor in at least ten times the maximum expected level downstream of the impediment 4 3 Mounting Options 4 3 14 Wall Mounting Optional 22 Wall mounting the 950 Flow Meter requires the optional Wall Mounting Bracket P N 2743 This bracket provides stable secure mounting for the flow meter and provides
124. ime Out period to 12 Seconds or greater to prevent future communication buffer overflows Yes Is the protocol of the Master device Modbus ASCII Yes No protocol of the Master device be changed to Yes k d Change the protocol of the Master device to Modbus ASCII Obtain a protocol converter to convert from the existing protocol to Modbus ASCII No El oot ail on ae 127 SCADA Modbus System Guidelines 950 SCADA Modbus No Response Troubleshooting Flow Chart 2 of 5 EA Continued from sheet 1 J Is the Master device Pa Can the Master device be Obtain a protocol converter to convert the communication parameters to 7 data bits even parity 1 stop bit configured for 7 data No No OE configured for 7 bits 1 stop bit even even 1 parity Yes Configure the Master lt device for 7 data bits Yes even parity 1 stop bit SRT SPOR nee Pe cope p me NOS m PU E IE CUN E p e a N Is there a constant 5 18 VDC between pins C and B Gnd of the RS 232 able that is attache Configure the Master device that is communicating with the 950 to keep the DTR Pin C of the flow meter constantly held high for the duration of all communications a H ll MM Does the baud rate of the 950 m
125. in any register address greater then 40083 will be ignored If a range of registers is requested and that range includes register addresses greater then 40083 the entire request will be ignored Response Check the number of registers being polled Additionally the 950 Flow Meter checks all Modbus messages to see if the correct number of registers is requested for the type of data being returned The meter will ignore the request if the number of registers requested does not coincide with the correct number of registers needed to accurately display the data For example Velocity is a floating point value stored in register 40009 40010 Because all floating point values require two registers the meter would ignore a request to read just the data in register 40009 yet it would respond correctly to a request to read the data stored in both registers 40009 AND 40010 Consequently if the meter received a single request to read both Level 40007 40008 and Velocity 40009 40010 the request would have to be for an even number of registers for the meter to respond Problem 950 Flow Meter does not respond to any Modbus message requests Note It is imperative that the DTR be asserted prior to the communication session and that it remains asserted throughout the entire communication session Response Check the DTR Signal Line The 950 Flow Meter will not respond to any Modbus messages until the device connected to the RS232 port asserts raises the DT
126. is invisible to the flow meter Do not extend the invisible range to where it meets or overlaps the highest expected level in the channel Have a gap of at least 5 cm 2 in between the invisible range and the highest expected level Only objects beyond the invisible range can be detected 41 Sensor Installation Figure 6 Side View of In Pipe 7 ZU LLLL 2 LLLL 2 7 Le i B KEY e RNSSRNSSRRSSNRSNSRNSSNRSNNRNNSRNSSNNSNNRNNNNM Pipe Ceiling 5 Internal Deadband 18 cm 7 09 in Distance from Sensor Range 0 to 2 4 m 0 to 8 ft 6 Pipe Floor 45 Deflector 7 Minimum distance to reflecting obstruction 2 m 82 in 4 Ultrasonic Sensor 8 Reflecting Obstruction 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS CALIBRATION ULTRASONIC SENSOR 2 Selectthe Invisible Range option using the UP and DOWN soft keys Press SELECT to continue Enter the Distance to End of the Invisible Range using the keypad 4 Select either inches or centimeters using the CHANGE UNITS soft key Press ACCEPT when finished 6 3 Submerged Area Velocity Sensor Submerged Area Velocity sensors can measure depth and velocity simultaneously 6 3 1 Bare Lead Sensor Cables Bare lead sensor cables are used in those cases where the cable will be run through a conduit When conduit is used it is recommended that the conduit be 1 inch or larger 6 3 2 Junction Box Connection Procedure Connect the bare l
127. ity While a software lock can be programmed to keep unauthorized personnel from operating the keypad the front cover locking ability provides added security against tampering The cover perimeter contains a gasket seal to keep moisture and dirt from entering the front panel area This seal is not required to maintain the NEMA 4X 6 rating of the case 17 Introduction Figure 1 950 Flow Meter Front Panel 2 00 AM 21 APR 93 X MAIN MENU TE STATUS READY TO START INTERNAL HUMIDITY REPLACE DESICCANT WHEN PINK TOTAL FLOW Description Menu bar Function The menu bar appears in a black band on the top edge of the display The upper left corner of the menu bar shows the time and date The upper right corner shows the name of the current menu Display The 950 Flow Meter liquid crystal display LCD works in conjunction with the four soft keys as a guide through all programming steps The display also provides other useful information as described below Soft keys The soft keys are the blank white keys located to the left and right of the display The function of each key is according to the appearance of the display If no function is shown for a specific key that key is not currently needed The soft key labels appear on the display and point with a straight line to the proper soft key to push for that action In some cases during a programming step you will be asked to pick an item f
128. ler line to the full reservoir air pressure 3 This causes a high pressure air purge of the bubbler line to blow out any silt or debris that may clog the line and impede the normal flow of air B 9 Advanced Options B 10 Alarms 98 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS 2 Use the up and down arrow soft keys to highlight the choice then press the SELECT soft key to pick that item 3 Proceed through the series of screens to configure the parameters for the selected item Advanced Options include the following e 4 20 mA Outputs section 8 3 1 on page 68 e Alarms section 8 4 on page 72 e Calibration e Flow Totalizer Flow Totalizer on page 103 e Diagnostics Diagnostics on page 101 e Data Log Data Log on page 99 e Storm Water Stormwater on page 106 e Set Point Sampling Set Point Sampling on page 105 e Languages English Czech Danish French German Italian Portuguese Swedish Dutch and Spanish The 950 supports English and one other selected language Setting the Deadband After entering the trip point enter a deadband value The deadband is the area between alarm turn on and turn off Note Rainfall and Flow Rate of Change alarms are High Set Point conditions they take no deadband and they are time dependent The purpose of setting a deadband is to eliminate alarm relay chatter which can occur if the turn on and turn off values are too close together Small f
129. low Chart SIGMA 950 Flow Meter OPTIONS Flowchart Shows Status Screen LEVEL 122 31 in FLOW 345 12 gpm TOTAL X10 121217 gal BATTERY 12 2 volts Select a Channel LAccept Enter 4 mA Input Value to Assign to Output A or B Accept Enter 20 mA Input Value or ibrati lect Calibration seleci selectp Device Address or v Communications Setup select Enter Phone Proc Temp Rainfall pH ORP Set Logging Level Flow Interval Set Memory Channel 1 Mode Channel 2 select Slate or Wrap Channel 3 Channel 4 Select Units Arrow Channel 5 if applicable Indicates Channel 6 Item is Logged Channel 7 select Display Test or Keypad Test or Demonstration Graph or Events Modify Setup select Select Scaling X n select Select Total Flow Units af cf gal or m i Reset select Reset Totalizer Y N or View Totals select Resettable Total Non Resetable Total __ zs o t5 o U 2 Phe amp w 3 o 6 oO 2 e e oO Qo 8 T o Q a t 3 oa Screen Saver Mode AC power only Set High or Low d Select Condition Level Trip Point Setpoint select Flow Flow Rate of Deadband Sampling Change pH ORP Temp dd Disable and Time etc Condition Interval or Storm Water select Enable select Select Rain Level Rain select Enter Start Conditions Disable or Level Rain and Level Rate of Rain and or
130. lso verifies the upper left soft key operation LCD Test verifies all the pixels in the Liquid Crystal Display LCD are functional The LCD is made up of 14 400 pixels that are turned on and off as needed to create the display of graphics and text Each individual pixel is turned on and off by its own transistor If a transistor fails the pixel will not turn on potentially causing an unreadable or confusing display Select LCD TEST from the Diagnostics Menu The display will become black for 3 seconds to verify that all pixels are functional A defective pixel will stand out as a white dot in the field of black dots A message THE DISPLAY WILL REMAIN INVERTED FOR 3 SECONDS is shown for 2 seconds followed by a 3 second period with all dots turned on B 15 3 Demonstration Graph The demonstration graph provides a small portion of demonstration data to use when learning how to use the graphing screen for the first time or for training others on its operation No data logging is required to use the demonstration graph B 15 4 Velocity Analysis 102 A velocity probe must be installed in the flow stream and must be connected to the meter in order for this diagnostic to work This diagnostic allows the viewing of real time readings directly from the Submerged Depth Velocity Probe It shows the current velocity Signal Strength percentage of Doppler signal returning to the probe and a real time velocity measurement of the flow
131. luctuations that occur when the reading is at or near the trip point can toggle an alarm relay on and off very rapidly Note You must log rainfall to use an alarm on a rainfall condition You must log flow in order to implement an alarm on a flow rate of change If you forget you are reminded when the program begins In the pH example Figure 27 the deadband is set to 0 10 pH When the pH reached 6 9 lower dashed line the alarm tripped but the alarm did not turn off until the pH came back up to 7 00 This difference is the deadband setting which should be set to the characteristics of each measured item Four alarm relays are provided with SPDT Form C contacts The normally open normally closed and common contacts are on the terminal wiring board B 11 Data Log pH Programming Features Multiple alarms can be enabled one at a time Multiple alarms can be assigned to individual trouble conditions to individual relays or assigned to all the same relay Figure 27 Deadband Concept 7 607 7 40 X AY Pd bM 720 Alarm Off 7 00 4 A ce tenn nia Oo Deadband 6 80 6 60 Alarm On Low Alarm Setpoint 6 9 pH 6 40 From the Main Menu select SETUP gt ADVANCED OPTIONS gt DATA LOG The Sigma 950 Flow Meter can record up to 115 630 readings from any or all input channels and store them in solid state battery backed memory for later viewing or retrieval This option selects logged input c
132. m Resistive Load 600 ohms e Output Voltage 24 VDC no load Table 25 4 20 mA Connector Pin Assignments Pin Signal Description Wire Color A output A pos yellow B output A neg black C output B pos red D output B neg green Cable Required 4 20 mA Output Cable Assembly 7 6 m 25 ft 4 pin connector on one end tinned wire leads on the other end P N 2924 8 3 1 2 Programming the 4 20 mA Output 68 The dual isolated 4 20 mA current loop outputs on the 950 Flow Meter are unique they can be assigned to any of the available channels not just flow In addition the 4 mA and 20 mA current levels are programmed to any desired minimum and maximum value for that channel 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt 4 20 mA OUTPUTS gt SELECT 2 When the 4 20 mA outputs are disabled and the 950 is not completely turned off they will continue to output a steady 4 mA 3 Press CHANGE CHOICE to enable the 4 20 mA outputs Press ACCEPT Communications Setup 4 Choose OUTPUT A or OUTPUT B and press SELECT 11 00 AM 21 APR 01 4 20 mA OUTPUTS OUTPUT A OUTPUT B SELECT RETURN 5 Select an Input Channel channel 1 2 3 flow etc to assign to that output Press CHANGE CHOICE to cycle through the channel names When the desired channel is displayed press ACCEPT 11 00 AM 21 APR 01 4 20 mA OUTPUTS CHANGE ACCEPT
133. mations suppl mentaires dans les mati res suivantes Contr le avant entr e Ventilation Proc dures d entr e Proc dures d vacuation et de secours et M thodes de travail s res On April 15 1993 OSHA s final ruling on CFR 1910 146 Permit Required Confined Spaces became law This standard directly affects more than 250 000 industrial sites in the United States and was created to protect the health and safety of workers in confined spaces Definition of Confined Space A Confined Space is any location or enclosure that presents or has the immediate potential to present one or more of the following conditions e An atmosphere with less than 19 5 or greater than 23 5 oxygen and or more than 10 ppm Hydrogen Sulfide H5S e Anatmosphere that may be flammable or explosive due to gases vapors mists dusts or fibers Safety Precautions e Toxic materials which upon contact or inhalation could result in injury impairment of health or death Confined spaces are not designed for human occupancy They have restricted entry and contain known or potential hazards Examples of confined spaces include manholes stacks pipes vats switch vaults and other similar locations Standard safety procedures must always be followed prior to entry into confined spaces and or locations where hazardous gases vapors mists dusts or fibers may be present Before entering any confined space check with your employer for procedures related to
134. meric key on the keypad while a graph is displayed causes the data cursor to jump to the location on the graph that is represented by that key For example pressing the 0 key moves the data cursor to the far left end or 0 position on the graph Pressing the 5 key moves the data cursor to the middle or 5096 position of the graph Pressing the 9 key moves the cursor to the 9096 position Next Channel Soft Key 96 Graphs data from the next logged channel For example if the 950 is logging Level Flow and pH and the Level graph is currently displayed the NEXT CHANNEL soft key causes the Flow channel to be graphed Pressing Next Channel again will create a graph for pH channel Pressing NEXT CHANNEL again returns to the Level graph selects a time period of interest and compares different graphs Programming Features B 5 Graphic Display Averaging The Sigma 950 Flow Meter can display a graph that consists of a maximum of 180 individual dots Since a 24 hour period could contain as many as 1 440 data points assuming a one minute recording interval one reading each minute it would be impossible to plot every data point on the graph When more than three hours more than 180 minutes worth of data is graphed the data points must be averaged When graphing a partial day of three hours or less all data points are graphed with no averaging When viewing a graph with more than 180 data points zoom in to the area of in
135. n CSuldeliTies s ucciastioo nett os ir eesgertt osi etiete e ndcaencatits x peduetsend ture nakin etansa 50 6 6 3 Depth Only and Bubbler Area Velocity Calibration sseeeeeneneee 50 Section 7 Optional Device Installation ssssssssssssseeeeeeee 53 RALE EUO e EUR M pp ETE 53 LAW Rain Gage COMMS CHOI atest sts oerte e deed esrb eae Ute ties i site ee ds cttam 53 ZA 2 Ran Gauge Programifigi t noue teris tla do E uat ip a uum aiai Gru A ianea inbena 53 T2 pHEBPrODOs niii ee eor tee erre e tee e berg oce por ae PR EXER TUI 54 2 1 PH Probe Connection iseti te ed end D d Da e d e A ER OPES d tb Le der eria 54 7 2 2 pH Probe Programiming eh et he Re eR LEER came cctv A OI CES ERU E niaba Eei 54 f 2 3 DH Probe Gallbrationi ike te e te eere ia en e o Y a 54 yecme idum M Nete 55 fad ORE Probe Connection asiaa demens at Ph tashalel sa doses Se TAEAE eee deeds 55 1 3 2 ORP Programming 4 tutore tior Lor rep Li ERR De ER ENS ERE Lut EH ERU RETE ARBDRE RR Du R EENES East 55 7 3 3 ORP Preamplifier Junction Box Calibration sssssse HH 56 TA Dissolved Oxvgeti PrO NE r pde eet non a PE EUM ot Team ss te Us cules ERES ET teineen iais 56 7 4 1 Dissolved Oxygen Probe Connection eccesso erinnern nane ti densities 56 7 4 2 Dissolved Oxygen Probe Programming ssseeenmen een 56 7 4 3 Dissolve
136. n of instrumentation in hazardous locations must be per the manufacturer s control drawing specifications Any modification to the instrumentation or the installation is not recommended and may result in life threatening injury and or damage to facilities DANGER Bien que certains produits Sigma soient con us et certifi s pour tre install s dans des endroits dangereux tels que d finis par le National Electric Code de nombreux produits Sigma ne conviennent pas pour de tels endroits Il rel ve de la responsabilit des personnes qui placent les produits dans des endroits dangereux de d terminer s ils sont adapt s cet environnement En outre des fins de s curit le placement de machines dans des endroits dangereux doit s effectuer dans le respect des consignes des sch mas de contr le du fabricant Toute modification apport e aux machines ou tout d placement de celles ci est d conseill car susceptible de provoquer des accidents mat riels et ou corporels 1 3 Confined Space Entry The following information is provided to guide users of Sigma 950 Flow Meters on the dangers and risks associated with entry into confined spaces DANGER Additional training in Pre Entry Testing Ventilation Entry Procedures Evacuation Rescue Procedures and Safety Work Practices is necessary to ensure against the loss of life in confined spaces DANGER Pour viter les accidents mortels dans les espaces confin s il faut organiser des for
137. n press SELECT to continue 4 Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT to continue 5 Enter a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar along the bottom edge of the display 55 Optional Device Installation 6 Select another channel to configure or press RETURN to back up one step Press the MAIN MENU function key to return to the Main Menu 7 3 3 ORP Preamplifier Junction Box Calibration Calibration of the ORP input circuit requires a source of DC voltage between 500 and 2000 m VDC The reference voltage must be applied to the ORP input terminals on the preamplifier junction box during calibration A regulated DC power supply or a standard C cell battery 1500 mVDC make excellent sources for reference voltage 1 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt ORP 2 Install the ORP junction box on the flow meter with the ORP probe removed 3 Apply a positive reference voltage to the ORP probe terminals in the junction box using either a 1 5 VDC C cell battery or a regulated power supply 4 Attach the positive battery terminal to the terminal block screw labeled glass and the negative battery terminal to the terminal block screw labeled ref 7 4 Dissolved Oxygen Probe The DO Conductivity option is available with or without additional analog inputs See Analog Communications on pag
138. ndard 1 0 mS to get the actual value to be used for calibration 1 0 mS correction factor 0 13002 0 86998 mS d Ifthe calibration temperature is higher than the labeled value then add that value to the standard 1 0 mS to get the actual value to be used for calibration 59 Optional Device Installation 7 Using the value that was calculated in step 6 enter the conductivity of the solution then press ACCEPT Conductivity calibration is complete Calibrating the Conductivity Temperature This calibration is necessary only when logging temperature 1 Place the probe in a liquid 2 Wait for the temperature reading to stabilize approximately 30 minutes 3 Enter the actual temperature of the liquid the current reading is shown for reference Temperature calibration is complete Table 24 Conductivity Values at Temperature for KCI Solution Solution Calibration Value Solution Calibration Value Solution Calibration Value Temp C to be Entered Temp C to be Entered Temp C to be Entered 30 1 099 25 1 000 20 0 902 29 8 1 095 24 8 0 996 19 8 0 898 29 6 1 091 24 6 0 992 19 6 0 894 29 4 1 087 24 4 0 988 19 4 0 890 29 2 1 083 24 2 0 984 19 2 0 886 29 1 079 24 0 980 19 0 882 28 8 1 075 23 8 0 976 18 8 0 878 28 6 1 071 23 6 0 972 18 6 0 874 28 4 1 067 23 4 0 968 18 4 0 870 28 2 1 063 23 2 0 965 18 2 0 866 28 1 059 23 0 961 18 0 862 27 8 1 055 22 8 0
139. nders beachtet werden m ssen Lesen und befolgen Sie diese Instruktionen aufmerksam um Verletzungen von Personen oder Sch den am Ger t zu vermeiden In diesem Abschnitt beschriebene Installations und Wartungsaufgaben d rfen nur von qualifiziertem Personal durchgef hrt werden PERICOLO Alcune parti di questo manuale contengono informazioni sotto forma d avvertimenti di precauzioni e di osservazioni le quali richiedono una particolare attenzione La preghiamo di leggere attentivamente e di rispettare quelle istruzioni per evitare ogni ferita corporale e danneggiamento della macchina Solo gli operatori qualificati per l uso di questa macchina sono autorizzati ad effettuare le operazioni di manutenzione descritte in questa parte del manuale DANGER This instrument should be installed by qualified technical personnel to ensure adherence to all applicable electrical codes DANGER Cet appareil doit tre install par du personnel technique qualifi afin d assurer le respect de toutes les normes applicables d lectricit Capped watertight connectors for external devices are located along the left side of the case Level sensor inputs and accessories are located along the right side of the case A recessed pocket for installing the flow meter power supply is located at the top rear of the case 21 Controller Installation 4 1 Unpacking the Instrument Remove the 950 Flow Meter from its shipping carton and inspect it for any vis
140. ne appears in the center of the display Press the ACCEPT soft key to continue 11 00 AM 21 APR 01 MODEM SETUP CHANGE ACCEPT CHOICE DIAL METHOD TONE CANCEL CHOICES TONE PULSE 67 Communications Setup 8 3 Analog Communications Channels 1 through 7 are analog input channels that can accept a signal from an external device This signal may range from 4 VDC min to 4 VDC max or from 0 to 20 mA DC depending on the input selected In some cases input signals from certain devices may also fall somewhere within those ranges For that reason each analog input channel must be mapped to the minimum and maximum signal limits of the external device 8 3 1 4 20 mA Output 8 3 1 1 4 20 mA Connections Note Due to the power demand of current loops this option requires that an ac power supply be installed on the flow meter Battery power is not sufficient to support the 4 20 mA current loop power requirements The 4 20 mA option is available as one or two current loop interfaces for controlling external devices such as a chlorinator or a chart recorder Either one or both of the 4 20 mA outputs can be factory installed and are isolated from each other Isolation Voltage Rating Note 950 flow meters are available with one or two 4 20 mA outputs Both outputs are installed in one receptacle e Between flow meter and either 4 20 mA output 2500 V ac e Between the two 4 20 mA outputs 1500 V ac e Maximu
141. nect sensor cable wires 2 Connect to desiccant tubing 5 Insert tubing P N 4628 3 Cover 6 Connectto sensor cable Table 13 Submerged Area Velocity Sensor Connection Pin Assignments Pin Signal Description Wire Color A 12 VDC red ground green receive ground b w shield 43 Sensor Installation Table 13 Submerged Area Velocity Sensor Connection Pin Assignments Pin Signal Description Wire Color D receive b w center E transmit ground black shield F transmit black center G depth black H depth white 6 3 3 Submerged Area Velocity Sensor Programming 1 9 10 11 12 If the flow meter is equipped with multiple sensors from the Main Menu select OPTIONS gt LEVEL SENSOR Select Submerged Xducer using the CHANGE CHOICE soft key then press ACCEPT From the MAIN MENU select SETUP gt MODIFY SELECTED ITEMS Highlight Velocity Direction using the UP and DOWN soft keys Press SELECT to continue Set the velocity direction upstream downstream or always positive using the CHANGE CHOICE soft key Press ACCEPT to continue Highlight Velocity Units using the UP and DOWN soft keys Press SELECT to continue Set the Velocity Units ft s or m s using the UP and DOWN soft keys Press ACCEPT to continue Highlight Velocity Cutoff using the UP and DOWN keys Press SELECT to continue Read the Velocity Cutoff information screen Press any key to continue Set the Velocit
142. nels Each channel added to the recording interval adds additional awake time to the interval Optimum recording is obtained logging two channels or less Downloading from the Data Transfer Unit The frequency at which the meter gets downloaded will also affect battery life During an RS232 download to a Data Transfer Unit the meter must power up to retrieve the data from memory and also power the Data Transfer Unit Download data only once per week or less when possible Selection of Batteries Using the wrong batteries in the Alkaline Battery Pack will result in less than expected battery life and could possibly damage the assembly The LED indicator located above each charging station functions differently depending on the type of battery being charged Appendix G Troubleshooting Basic Troubleshooting Problem Instrument Will Not Power Up With ac Power Causes Blown fuse Solutions Check the fuse located on the base board see section 9 4 on page 79 Circuit breaker issue Check the circuit breaker for the main power Breaker is good but still no power Check to see if the outlet is receiving power Breaker and outlet is good still no power Try using a battery or another power supply Instrument Will Not Power Up With DC Power Blown fuse Battery is not charged Check the fuse located on the base board see section 9 4 on page 79 Replace with a fully charged battery
143. nennt nnns sensn 29 5 2 Basic Prograrnimibigsuu e eec o o Meena Neath dia o Red oe eh ated onda etg ees ue cui Tea ere 29 Section 6 Sensor Installation ssssssssssssseeeeeeeeeeenes 37 6 1 Downlooking Ultrasonic Depth Sensor ioci rito teret e ctn e eeu ete creed uotis 37 6 1 1 Downlooking Ultrasonic Depth Sensor Connection seeeeeee 37 6 1 2 Downlooking Ultrasonic Depth Sensor Programming eeeeeeeee 37 6 1 3 Downlooking Ultrasonic Depth Sensor Calibration sseeeeeeeeee 38 6 1 3 1 Eiquid Depthi iier tede n eoe Ee ERES Enea spe deti arbe d Funde ea ga 38 6 1 3 2 Sensor Height utr eL n ot CURE AUN Maite tope st exea eee Ru o cunts 39 0 1 3 3 Setting the Invisible Range eter nt tn ER Fun mb Rea nua 39 6 2 In Pipe Zero Deadband Ultrasonic Depth Sensor eeeeeessesssssesesseeseeeeeneeeenes 40 6 2 2 Programming the In Pipe Zero Deadband Ultrasonic Depth Sensor 40 6 23 Beam ATIgle i etie ecole e Lope t oe patr AA aa el wand iON e peccare caus 40 6 2 4 Calibrating the In Pipe Zero Deadband Ultrasonic Depth Sensor sss 40 6 3 Submerged Area Velocity Sensor eec see eidem menn denen E ibn cnni 42 6 3 1 Bare Lead Sensor Cables oiu ciet id ubt doitpest tradite ble in aep not ete ha 42 6 3 2 Junction Box Connection Proced re
144. nnel 6 Channel 7 114 3 Calibrate inputs as needed chk 4 Communications Setup If modem is enabled ACCEPT any baud rate displayed Modem will independently establish actual baud rate between 1200 and 14 400 Pager Phone Numbers if enabled Pager Service Pager 1 Pager 2 Pager 3 Select Baud Rate for RS232 1200 2400 4800 9600 19200 Programming Worksheet 5 Configure DATA LOGGING for each desired channel Channel Name Analog Channel Signal Description Logged Y N Units Logging Interval min Process Temperature Rainfall pH Level Flow Analog Channel 1 Analog Channel 2 Analog Channel 3 Analog Channel 4 Analog Channel 5 Analog Channel 6 Analog Channel 7 6 Configure Flow Totalizer Scaling X X1 X10 X100 X1 000 000 Flow Units Acre feet cubic feet gallons liters cubic meters 7 Configure SETPOINT SAMPLING if it is desired to trigger a sampler based on one of the following conditions Channel Name Level High Trigger Low Trigger Deadband Time Interval Flow Flow Rate of Change pH Temperature Rainfall Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 115 Programming Worksheet 8 Configure STORM WATER if desired Start Condition Rain Level Rain amp Level Rain or Level
145. ogramming Alarms can be programmed to activate based on certain conditions low battery low memory etc Refer to 950 Flow Meter Advanced Options on page 87 When an alarm is tripped an action is initiated report via modem dial a pager or set a relay Two types of alarms are trouble and set point alarms 8 4 2 1 Trouble Alarms Trouble Alarms initiate an action when a trouble condition occurs For example a relay may close when the memory is full 1 From the Main Menu select SETUP ADVANCED OPTIONS ALARMS 2 Enable one of the trouble conditions 3 Select an action to occur when the alarm is activated Table 29 shows each Trouble Condition and its cause Table 29 Trouble Alarms Trouble Condition Cause Low Memory Battery Internal memory battery voltage is too low Change batteries Low Slate Memory Free slate memory is less than 2096 Bubbler system not developing sufficient air pressure Inspect air pump reservoir and Low Bubbler Rressure associated tubing assemblies for problem Clogged Bubbler Bubbler line obstructed or submerged below ten feet U Sonic Echo Loss A pulse of sound was sent but no echo was received back The echo has been temporarily deflected by a change in site conditions such as floating debris or foam in the channel wind etc Transducer Ringing Transducer is operating within the deadband U Sonic Failure Transducer not plugged in Cable damaged Transducer th
146. olling the meter with Modbus are not the same as the data values displayed in the current status screen of the meter 126 Response Confirm that the correct register addresses are being polled Check to make sure the register address being polled corresponds to the correct data channel For example if polling for FLOW make sure the server or MMI is requesting data from registers 40033 40034 If polling for several values at the same time try changing the polling so that only one value is polled at a time Then check to see if the polled value matches a different data channel in the meter For example if polling for Level and it appears that you are getting the data for Velocity instead you probably are polling the wrong registers Response Check the data format of the Modbus server When configuring a Modbus server or MMI application to poll a 950 Flow Meter it is absolutely essential that the correct data format is selected for that particular data channel register For example when polling for Flow Level or Velocity which are all floating point values the Modbus server or MMI must be configured to read these values as floating point values If the server or MMI is formatting this data as a data type other then floating point the values will not be read or displayed correctly Likewise if polling the meter for engineering units which are represented by integer values such as Flow Units of Measure or Level Units of Measure t
147. olts RUNNING Selecting FLOW TOTALIZER from the Advanced Options menu causes three choices to be displayed e Modify Setup e Reset e View Totals Modify Setup Modify Setup allows you to select a totalizer scaling factor and a flow unit of measure To access the totalizer setup menu highlight MODIFY SETUP using the UP and DOWN soft keys then press SELECT to continue All three totalizers are scaled with one of seven scaling factors X1 X10 X100 X1000 X10 000 X100 000 or X1 000 000 The selected scaling factor always applies to all totalizers Press the CHANGE CHOICE soft key to cycle through the available scaling choices and then press the ACCEPT soft key to continue Totalizer Flow Units The next screen will allow you to select a flow unit of measure acre feet cubic feet gallons liters and cubic meters This selection is independent of the flow units selected in the Setup Menu Press CHANGE CHOICE to cycle through the available choices then press ACCEPT to continue Reset Totalizer Selecting RESET from the Totalizer menu will allow you to reset the resettable totalizer only The non resettable totalizer will only be reset if one of the following conditions occur e Change in totalizer scaling e Change in totalizer units of measure e Change in primary device e Start of new program If any of the above conditions occur both the resettable and the non resettable totalizers are reset The resettable totalizer
148. ontaminants such as grease In these environments mount the probe so that the water scrubs the probe For example mount the probe so that probe tip faces downstream this lets the cable protect the probe tip Alternatively mount the probe with the tip pointing into the flow so that the flow scrubs the tip Some sites require that the probe be mounted inside a short piece of perforated PVC pipe At very poor sites mount the probe inside more than one piece of perforated PVC with the holes offset 141 Troubleshooting continuously reads pH 14 or drifts above 14 Slow response and or erratic readings either glass or reference electrode Very high impedance in either glass or reference Problem Cause Solution Inspect the cable and connector of the faulty electrode for evidence of a crushed or broken cable jacket or brittleness of the cable due to exposure to heat Discard Meter Open circuit in the electrode if damage is present Manipulate meter electrode connections to check for intermittent continuity Replace if faulty Inspect the bulb making sure it is filled with solution If not shake down like a clinical thermometer to displace air in the pH bulb Retest Inspect the bulb for signs of coating Inspect the pH bulb for coating or clogging If present clean thoroughly Keep the electrode wet at all times If it dries out the impedance will increase dramatically To restore performance so
149. or logged 2 C When the desired choice is displayed press ACCEPT to continue and set level units 11 00 AM 21 APR 01 FLOW UNITS CHANGE ACCEPT CHOICE FLOW UNITS mdg CANCEL SELECT APPROPRIATE UNITS Table 4 Flow Unit Choices Abbreviation Flow Unit Abbreviation Flow Units gps Gallons per second cfs Cubic feet per second gpm Gallons per minute cfm Cubic feet per minute gph Gallons per hour cfh Cubic feet per hour lpm Liters per minute cms Cubic meters per second mgd Million gallons per day cmh Cubic meters per hour Step 3 Level Units 3 A Next the flow meter will display the Level Units screen 3 B Select the units of measure to use when displaying level readings Table 5 Level units of measure are used whenever a level reading is displayed or logged Table 5 Level Units Choices Abbreviation Level Unit in inches ft feet cm centimeters M meters 30 Basic Programming Setup 3 C Press CHANGE CHOICE to cycle through each of the level unit choices Press ACCEPT to continue to primary device setup Step 4 Primary Device Note Selecting the appropriate primary device is critical for proper flow rate calculations 4 A Next the flow meter will display the Primary Device screen 4 B Select the desired primary device enter the calculation method shape and pipe diameter for that primary device 4 C Press CHANGE CHOICE to cycle through the primary
150. or use with Hach Tipping Bucket Rain Gauge Flow meter records rainfall data in 0 01 in increments Analog Input Channels General Information Up to 7 additional data logging channels record data from external source s Field assignable units 4 5 to 4 5 VDC 0 5 full scale voltage accuracy and 0 to 20 mA 0 2 full scale 4 20 mA accuracy with 200 ohm impedence Alarm Relays General Information 4 20 mA Output 4 10 amp 120 Vac or 5 amp 250 Vac form C relays User assignable for any internal or external data channel or event General Information 2 output signals available User assignable Optically isolated 0 1 FS error Maximum Resistive Load 600 ohms Output Voltage 24 VDC no load Insulation Voltage Communications Between flow meter and 4 20 mA output 2500 Vac Between the two 4 20 mA outputs 1500 Vac General Information RS232 up to 19 200 baud Modem 14400 bps V 32 bis V 42 MNP2 4 error correction V 42 bis MNP5 data compression MNP 10 EC Cellular Protocol Sensor Specifications Pager SCADA Modbus communication protocol standard via RS232 or optional modem Bubbler Sensor Accuracy 0 003 m 0 011 ft linearity and hysteresis at 22 C 72 F from 0 01 to 11 75 ft Range 0 003 to 3 6 m 0 01 to 11 75 ft Ambient Operating Temperature 18 to 63 C 0 to 145 F Compensated Temperature 0 to
151. ove 1 Select the Liquid Depth method 2 Take a physical measurement of the liquid depth head and enter the value 3 Press ACCEPT when finished Sensor Height Sensor height calibration is generally used when access to the primary device is difficult such as confined space entry in a manhole or when there is no liquid flowing during installation of the flow meter This calibration method requires compensation for the internal deadband in the sensor housing Measurement uncertainty increases to 1 07 cm 0 035 ft for a 30 cm 1 ft change in level from the calibration point Use this method only if the Liquid Depth method is not an option Continue from Step 8 above 1 Measure the distance from the bottom of the sensor to the zero flow point Add 18 cm 7 09 in to the measured distance to obtain the total zero flow distance for the in pipe sensor Refer to Figure 6 on page 42 2 Select the Sensor Height calibration method and enter the total zero flow distance from Step 1 3 Press ACCEPT when finished Setting the Invisible Range Note When programming the invisible range 18 cm 7 09 in must be added to the desired range to compensate for the internal deadband distance between the sensor the reflector and the bottom of the sensor housing The 950 Flow Meter is equipped with an invisible range feature to prevent false echoes from tops of channel walls ladder rungs shelves etc A user selected range is defined that
152. ower Input J2 Relay Option J3 CPU Circuit Board J4 4 20 mA Output Option J5 Display push button J6 Rain Gauge Option J7 Bubbler Assembly J8 pH ORP Option J9 Submerged Pressure Sensor J10 Analog Input Option J11 Sampler Interface Connector 80 Maintenance Figure 20 CPU Board G Jeb E J10 J7 J1 J4 F1 J11 J5 G9 J2 r Table 32 CPU Board Fuse ID Description Type amp Rating RS485 Interface Connector 2 Amp 250 V ac Fast blow 5 x 20 mm P N 2605 Table 33 CPU Board Connectors ID Description J1 Liquid Crystal Display LCD Board J2 Mechanical Totalizer J3 not used J4 Base Board J5 Memory Backup Battery Pack J6 RS232 Serial Port J7 RS 485 Submerged Pressure Probe not used on bubbler 950 J8 Modem Option Module J9 Liquid Crystal Display LED back light J10 Keypad J11 not used 9 4 1 Fuse Removal and Inspection To remove a fuse pull it straight out of the clips that hold it in place Usually a close look will tell you if a fuse is blown The wire strand inside the glass tube will be broken Occasionally it may take an ohmmeter to verify if a fuse is good or not You may need to remove plug J1 to access fuse F1 Always replace any fuse with the exact same size and type rating Over rating or bypassing a fuse could lead to severely damaged equipment 81
153. p and plug the pre amp into the 950 Flow Meter Table 20 Conductivity Pin Assignments Pin Signal Description Wire Color 12 VDC white signal ground blue input 1 4 20 mA DC yellow input 2 4 20 mA DC black input 3 4 20 mA DC red dissolved oxygen green dissolved oxygen temp probe gray conductivity brown conductivity temp probe purple not used orange 7 5 2 Conductivity Probe Programming 1 2 3 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt DATALOG Highlight Select Inputs using the UP and DOWN soft keys and then press SELECT Highlight Conductivity COND using the UP and DOWN soft keys then press SELECT Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT Enter a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar along the bottom edge of the display Press CHANGE CHOICE to select the appropriate units mS uS Press ACCEPT to continue Select another channel to configure or press RETURN to back up one step Press the MAIN MENU function key to return to the Main Menu 7 5 3 Conductivity Temperature Programming Note Conductivity measurements are only temperature compensated if the conductivity temperature is enabled in the datalog 1 2 3 58 From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt DATALOG Highlight Select Inputs using the UP and DOW
154. ptional six digit non resettable mechanical totalizer is available for the flow meter Located below the Humidity Indicator the totalizer indicates total flow and supplements the internal software totalizers one resettable and one non resettable that are configured during programming Mechanical The totalizer can be configured for all conditions and installations because flow units and scaling are 6 Totalizer selectable To select flow and scaling factors for the mechanical and internal software totalizers see Option Flow Totalizer on page 103 To obtain the total flow for any period of time record the number at the start of the time period subtract it from the number at the end of the period and then multiply the difference by the scaling factor The Display push button is located on the upper right side of the case It allows you to read the display without opening the cover The 950 Flow Meter is optimized for portable battery powered use Its unique power saving modes conserve battery resources by putting the meter to sleep during any period of inactivity 7 Display During battery operation or ac power with the screen saver enabled pressing the Display push button Button will wake up the flow meter and cause it to turn on the display The Status Screen is the first screen displayed Another press of the button causes the display to show additional status information if necessary Continuing to press the Display pu
155. quest for just one floating point value if the number of registers requested was only one instead of two Yes Does the 950 meter communicate correctly with the Software No No Swap the RX and TX lines on the serial cable connected to the 950 Continued on sheet 4 Call our tech support at 800 635 1230 or Outside the U S amp Canada call 1 301 874 5599 Calculate the correct number of registers needed for the data types being returned and then change the polling request accordingly SCADA Modbus System Guidelines 950 SCADA Modbus No Response Troubleshooting Flow Chart 4 of 5 oe from sheet 2 Is the flow meter responding now No Y Put the RX and TX wires back to the way they were before Yes gt Congratulations N W You ve fixed it Use either a protocol analyzer or a communications program such as Windows Terminal or Comit running on a PC in place of the 950 to intercept and verify the Modbus polling request being sent from the master device to the 950 Yes Pad Pd Is the Modbus message being received Does the Modbus message start with a colon and end with a Carriage Return and Line Feed pair Yes Does the message address match the Modbus device address of the 950 Yes Y Make a note of the Modbus message and then call tech support to have the Modbus mess
156. r evitare ogni ferita corporale e danneggiamento della macchina Solo gli operatori qualificati per l uso di questa macchina sono autorizzati ad effettuare le operazioni d istallazione e di manutenzione descritte in questa parte del manuale This chapter explains how to maintain repair and upgrade the Sigma 950 Flow Meter It describes how to open the case inspect and replace fuses replace desiccant and perform operating system software upgrades 9 1 Routine Maintenance Routine maintenance of the 950 Flow Meter consists of calibrating input channels and cleaning the case 9 1 1 Calibration Calibration should be performed on all channels at the proper interval for that type of input 9 1 2 Cleaning the Case Clean the outside of the case with a damp cloth and mild detergent Use a non abrasive plastic cleanser on the front cover if necessary Avoid harsh chemicals or solvents because they may harm the case or fog the front cover 75 Maintenance 9 1 3 Maintaining Desiccant Cartridges and Desiccant The desiccant cartridges are located on the right side of the case on bubbler units and are connected to the reference and intake ports They keep the air that is used by the bubbler system dry The desiccant material in the tubes remove moisture from the air Eventually the desiccant becomes saturated and needs to be replaced The desiccant material contains tiny blue beads that will turn pink when saturated When the beads turn pink eit
157. rom a list The soft keys on the right side of the display will change to display up and down arrows This allows you to scroll up and down the list of choices When the desired choice is highlighted press the SELECT soft key to choose that item 18 Status bar Humidity Indicator The appearance of the status bar changes depending upon the function being performed The lower left corner of the status bar indicates whether a program is Complete Running Halted or Ready To Start It will disappear if it is not needed during a programming step The lower right corner displays system alarm conditions such as low memory battery clogged bubbler line etc For a list of possible alarms see Alarm Relays on page 72 The status bar also lists valid choices when entering certain programming information For example when selecting level measurement units in the Level Units menu the status bar indicates the valid choices cm ft in or m The Internal Humidity Indicator changes from blue to pink when the humidity inside the case exceeds 60 percent An internal desiccant module absorbs any humidity that may have been trapped in the case during final assembly Under normal operating conditions this desiccant provides long term protection against condensed moisture inside the case Replace the internal desiccant module only if the indicator turns pink See Replacing the Internal Desiccant Module on page 82 Introduction An o
158. rom the Main Menu select OPTIONS gt ADVANCED OPTIONS gt DATALOG Highlight Select Inputs using the UP and DOWN soft keys then press SELECT Highlight D O Temp using the UP and DOWN soft keys then press SELECT Press CHANGE CHOICE to cycle between Logged and Not Logged then press ACCEPT Enter a logging interval using the numeric keypad then press ACCEPT Valid logging intervals are shown on the status bar along the bottom edge of the display Press CHANGE CHOICE to select the temperature units C F Press ACCEPT 7 4 4 Dissolved Oxygen Probe Calibration Note The membrane of a charged sensor must be kept moist If the membrane is allowed to dry completely the electrolyte film between the membrane and the platinum will evaporate destabilizing the sensor If the sensor will be out of water for more than 30 minutes put a small amount of water in the silicon soaking cap and install it over the protective guard Lift the edge of the cap to break the seal as it is being removed This will prevent a vacuum from forming inside the soaking cap while it is being removed which can result in the membrane becoming stretched 1 2 3 4 a 10 Connect a suitable power supply to the flow meter Power up the unit by pressing the ON button From the Main Menu select OPTIONS gt ADVANCED OPTIONS gt CALIBRATION gt DO Enter the ambient air temperature the current reading is displayed for reference using the numeric keypad
159. s Enabled and press ACCEPT 4 Select the output A or B to calibrate 69 Communications Setup Press any key to set the selected output to 4 00 mA DC Measure the current on the selected output using the multimeter and enter the measured value using the numeric keypad Press ACCEPT 7 Press any key to set the output to 20 00 mA DC 8 Measure the current on the selected output using the multimeter and enter the measured value using the numeric keypad Press ACCEPT to complete the calibration By entering the measured current values the microprocessor will electronically adjust the outputs to compensate for the difference between the measured values and the expected values Figure 15 Calibration with the Meter in the Loop 8 3 2 Analog Inputs 8 3 2 1 Analog Voltage Inputs 70 Note Note 4 20 mA inputs must be isolated Maximum load per input is 200 ohms There are a total of seven analog input channels available on the 950 Flow Meter These inputs accept 0 20 mA DC or 4 to 4 VDC analog signals They can be logged and graphed in the same manner as the five dedicated channels level flow rainfall etc and Communications Setup can also be used to trigger alarms cause set point samples and control 0 20 mA outputs Table 26 Analog Input Pin Assignments Pin Signal Description Description Wire Color A 12 VDC Provides a source of 12 VDC which may be white us
160. s how each instrument will know its device address recognize a message addressed to it determine the type of action to be taken and extract any data or other information contained in the message The flow meter and MMI communicate using a master slave technique in which only the master can initiate queries to a slave 950 The 950 will always be considered the slave never a master The master can address individual 950 Flow Meters or can broadcast a message to instruments within its scope Responses are never returned to broadcast queries from the master The Modbus protocol establishes the format for the master s query by placing into it the device address a function code defining the requested action any data to be sent and an error checking field The flow meter s response message is constructed using the Modbus format which confirms the action to be taken any data to be returned and an error checking field E 2 ASCII Transmission Mode The 950 Flow Meter is designed to communicate on standard Modbus networks using Modbus ASCII In ASCII mode messages start with a colon and end with a carriage return line feed pair The allowable characters transmitted for all fields are hexadecimal 0 9 and A F When a message is transmitted over a Modbus ASCII communication link each character or byte is sent in the order of Least Significant Bit to Most Significant Bit A typical message frame looks like the following START A
161. sensor The streamlined shape of the velocity only sensor allows velocity measurement in very low flow conditions When used in conjunction with a depth sensor the meter can calculate flow 6 4 1 Low Profile Velocity Only Low Profile Sensor Connection Note Use bare lead sensor and junction box for conduit installation The low profile velocity only sensor connector is located on the right side of the flow meter when facing the flow meter and is labeled Velocity The connector is keyed and can only be inserted in the proper orientation key up See Table 14 for pin assignments Table 14 Submerged Velocity Sensor Connector Pin Assignments Pin Signal Description Wire Color A 12 VDC red B ground green C receive shield b w shield D receive b w center E transmit shield black shield F transmit black center 6 4 2 Low Profile Velocity Only Sensor Programming 1 From the MAIN MENU select SETUP gt MODIFY SELECTED ITEMS 2 Highlight Velocity Direction using the UP and DOWN soft keys Press SELECT to continue 3 Setthe velocity direction upstream downstream or always positive using the CHANGE CHOICE soft key Press ACCEPT to continue Highlight Velocity Units using the UP and DOWN soft keys Press SELECT to continue Set the Velocity Units ft s or m s using the UP and DOWN soft keys Press ACCEPT to continue 7 Highlight Velocity Cutoff using the UP and DOWN soft keys Press SELECT
162. sh button will return you to the initial Status Screen after all information has been shown After three minutes of inactivity the display goes blank to conserve battery power 8 Soft Keys See item 3 The white keys located just above the numeric keys are function keys that are used often while operating the flow meter These functions are dedicated keys to allow quick access Main Menu This is the program starting point Press the Main Menu key at any time during Function programming to return to the Main Menu Screen The current action is cancelled if changes are not yet 9 Keys accepted Level Adjust Adjust the flow meter to match the current head or level contributing flow in the channel Run Stop Run or resume a program Stops a currently running program 40 Numeric The numeric keypad is located below the function keys It consists of the digits 0 through 9 a key Keypad and a decimal key Power 11 On Off To turn the flow meter power on off use the ON and OFF keys 3 2 1 Power Indicator Light When the unit is turned on a green light located next to the ON key flashes This does not indicate that a program is running but indicates that the unit has power because under some conditions battery operation or Screen Saver mode the display may automatically turn off to conserve battery power See Screen Saver Mode on page 105 for details on battery operation and the Screen Saver feature 19 Introduction 20
163. sleep conserving battery power Once per minute the flow meter wakes up logs the readings from all enabled input channels performs any other necessary duties and goes 99 Programming Features back to sleep This mode will give a quicker battery consumption but better resolution with longer logging intervals If a one minute logging interval is selected in power save mode a reading will be taken once per minute at which time that reading is logged If a five minute logging interval is selected readings are taken every minute but the data is not logged until the five minute logging interval ends At the time the readings are averaged over the previous five minutes that average is logged Note The Review All Items selection from the Setup menu indicates the maximum available logging hours for the channels and recording intervals you selected The flow meter calculates this information when the program is run using the RUN STOP key Continuous Mode When a one minute logging interval is selected a reading will be taken approximately every second but data is not logged until the logging interval ends At that time the readings are averaged over the logging interval that average is logged When a five minute logging interval is selected readings are still taken every second but the data is not logged until the five minute logging interval ends At that time the readings are averaged over the previous five minutes that average is logg
164. splay by minimizing its use To change the Screen Saver mode 1 Highlight SCREEN SAVER MODE on the Advanced Options Menu using the UP and DOWN arrow soft keys then press SELECT 2 Press CHANGE CHOICE to select a new Screen Saver Mode Enabled or Disabled Press ACCEPT to save the changes B 20 Set Point Sampling Set point sampling allows the control of an automatic liquid sampler from up to 14 different sources individually or simultaneously Upon reaching a user defined set point trigger the flow meter provides an output signal at the Sampler Interface This signal can be used to tell a sampler such as the Model SD900 Sampler that a set point condition has been reached and samples should be taken Set Point sampling defines a set of limits that inhibit sampling until an upset condition occurs causing the limits to be exceeded In this manner time money and collecting and testing samples that are within limits is not wasted because sampling is enabled only when the waste stream falls outside the set points Table 39 shows all possible sampling triggers and appropriate settings Table 39 Sampling Triggers Sampling Trigger Settings Level High and or Low condition deadband Flow High and or Low condition deadband Flow Rate of Change High condition within time interval Temperature High and or Low condition deadband pH High and or Low condition deadband Rainfall High condition within time interval 105
165. t 8 Apply minimum current output 4 mA from other instrument 9 Enter High Point 10 Apply maximum current output 20 mA from the other instrument 71 Communications Setup 11 Select another channel to configure or press RETURN to back up one step Press the MAIN MENU function key to return to the Main Menu Example A dissolved oxygen meter has an analog output signal that will connect to the 950 Flow Meter analog input channel 4 The DO meter puts out an analog signal which ranges from 1 VDC to 3 VDC which is equivalent to 0 to 500 ppm The DO meter is connected to Channel 1 and log readings from the DO meter occur once per minute To configure data logging for this example follow the steps below 1 Select DATA LOG from the Advanced Options menu 2 Highlight SELECT INPUTS using the UP and DOWN soft keys and then press SELECT 3 Highlight the analog channel to log Channel 4 using the UP and DOWN soft keys then press SELECT 4 Press CHANGE CHOICE to select Logged then press ACCEPT Enter a 1 minute logging interval using the numeric keypad then press ACCEPT 6 Press CHANGE CHOICE to cycle through the units of measure until ppm is displayed Press ACCEPT 7 Apply a voltage to the desired analog input which corresponds to 0 ppm or 1 VDC Enter 0 ppm using the numeric keypad and press ACCEPT 8 Apply a voltage to the same analog input that corresponds to 500 ppm or 3 V dc Enter 500 ppm using the n
166. t Sampling on page 105 Som ee Used in conjunction with Pin B this line is normally allowed to float and is switched to ground by transistor for the entire period that the set point condition exists Received from a waste water sampler and indicates that a E event input red sample has been collected Sample Taken information will N A appear in the data printout when downloaded Received from a waste water sampler and used in conjunction with the Event Input signal It tells the flow meter which bottle F bottle number input green was used when a sample was taken Sample Times and N A Dates information will appear in the data printout when downloaded Cable Required for Sampler Connections Multi Purpose Half Cable Assembly 3 0 m 10 ft 6 pin connector on one end tinned wire leads on the other end P N 941 or Multi Purpose Full Cable Assembly 3 0 m 10 ft 6 pin connector on both ends P N 940 Cables with 7 6 m 25 ft lengths and custom sizes are also available 4 7 2 Sampler Programming 26 1 2 From the Main Menu select SETUP gt MODIFY SELECTED ITEMS Scroll down and highlight SAMPLER PACING using the up and down arrow soft keys Press SELECT to continue Enable Sampler pacing using the CHANGE CHOICE soft key Press ACCEPT to continue Set the Sampler Pacing using the numeric keypad and Change Units using the CHANGE UNITS soft key The 950 Flow Meter will output one 12 VDC pulse each time the specifie
167. t be met for the program to begin Rain or Level either condition must be met for the program to begin Enter the Start Condition limits For Rain enter the amount of rainfall and the time period within which it must fall For Level enter the level limit For Rain and Level and Rain or Level enter the amount of rainfall and the time period within which it must fall and the desired level limit 107 Programming Features 108 Appendix C Primary Devices amp Head Measurement Locations These primary device illustrations are provided as a general guide to proper head measurement locations in commonly used primary devices Please contact the manufacturer of your primary device for detail Figure 28 Parshall Flume s Head Measurement Location Optional Integral Stilling Well a Y Parshall Flume r TOP VIEW Water Surface SIDE VIEW Submerged Flow Head Free Flow Measurement Point TOP j VIEW Indicates the point of measurement D Lower Water Surface Transition ET Throat D 2 109 Primary Devices amp Head Measurement Locations Figure 30 Leopold Lagco Flume s Head Measurement Location Leopold Lagco Flume TOP VIEW Upper Throat Lower Transition Transition Water Surface A SIDE H VIEW L o T Die D Conduit Diameter Head Measurement Point Figure 31 Flum
168. ted Mounting Rings Permanent Mounting Bracket installs directly to pipe wall Adjustable Mounting Band Kit Connection Bare lead connection through 3658 junction box or quick connect 13 Specifications Low Profile Velocity Only Sensor Accuracy 2 of reading Zero Stability 0 52 cm s 0 05 ft s Range 1 52 to 6 1 ms 5 to 20 ft s Resolution 0 3 cms 0 01 ft s Response Time 4 8 seconds Profile Time 4 8 seconds Length 6 86 cm 2 7 in Dimensions Width 3 81 cm 1 5 in Height 1 12 cm 0 44 in Cable Urethane Jacket 2x RG174U Coax Cables 4x 22 AWG Copper Stranded Cable Length 7 6 m 25 ft standard custom cable lengths to 76 m 250 ft are available Submerged Area Velocity Sensor 14 Velocity Measurement Method Doppler Ultrasound Twin 1 MHz piezoelectric crystals Accuracy 2 of reading Recommended Range 1 52 to 6 1 m s 5 to 20 ft s Zero Stability 0 015 m s 0 05 ft s Typical Minimum Depth 2 cm 0 8 in Depth Measurement Method Pressure Transducer with stainless steel diaphragm Material Polyurethane body 316 series stainless steel diaphragm Accuracy static 0 16 full scale 1 5 of reading at constant temp 2 5 C 0 20 full scale 1 75 of reading from 0 to 30 C 32 to 86 F 0 25 full scale 2 1 of reading from 0 to 70 C 32 to 158 F Standard D
169. terest using the Graph Partial Day option so all of the individual data points are displayed B 6 Options Features 11 00 AM 21 APR 01 OPTION MENU TIME DATE ADVANCED OPTIONS READY TO START The Options menu can set the e Time and Date for the real time clock in the Sigma 950 Flow Meter e Program the advanced features of the flow meter e Select level sensor when multiple sensors are installed B 7 Setting the Time and Date 1 From the Main Menu select OPTIONS gt TIME DATE 11 00 AM 21 APR 01 TIME DATE ACCEPT AM APR __ CLEAR MODE 12 HR FORMAT ENTRY USE KEY TO CHANGE 12 24 HR FORMAT 2 Starting with the hours and minutes use the numeric keypad to enter numbers in the flashing cursor Use the keys to toggle between 12 hour and 24 hour formats Use the soft keys on the right of the display to toggle the AM PM and month fields to the desired selection Press CLEAR ENTRY to clear all numeric fields When complete press ACCEPT to save the changes B 8 Purge Line Applies to Bubbler Depth Only and Bubbler Area Velocity Modes Only Note The Sigma 950 Flow Meter can be programmed to automatically purge at a present interval For more details see Depth Only and Bubbler Area Velocity Calibration on page 50 1 From the Main Menu select OPTIONS gt PURGE LINE 97 Programming Features 2 A solenoid valve opens for approximately one second temporarily connecting the bubb
170. ters af acre feet cf cubic feet Step 7 Site ID Note A text Site ID may be programmed via Hach s management software and an RS232 connection Creates an 1 8 digit site identification number The site ID will appear on all data printouts This feature is useful when multiple sites are monitored using a single flow meter or if data readings from multiple flow meters are collected 7 A Next the flow meter will display the Site ID screen 7 B Enter the site ID using the numeric keypad 7 C Press ACCEPT to continue to total flow units Step 8 Total Flow Units 8 A Next the flow meter will display the Total Flow Units screen 8 B Set the Total Flow Units gal Itr m3 af cf using the CHANGE CHOICE soft key Total flow units of measure are used whenever a total flow unit is displayed or logged 8 C Press ACCEPT to continue to velocity direction Step 9 Velocity Direction only when logging velocity 9 A Next the flow meter will display the Velocity Direction screen 9 B Set the Velocity Direction using the CHANGE CHOICE soft key The Velocity Direction feature adapts to a number of difficult sites that would otherwise not be able to measure velocity properly Upstream Downstream and Always Positive For more information see the Velocity Only Sensor Instruction Sheet Cat No 88006 89 9 C Press ACCEPT to move to velocity units setup 9 D Set the velocity units ft s mS using the CHANGE CHOICE soft key
171. that the sensor will be mounted in the flow stream horizontal or vertical using the CHANGE CHOICE soft key Use this same position during calibration to ensure optimum accuracy Press ACCEPT to continue 11 00 AM 21 APR 01 CALIBRATION Sensor Installation CHANGE ACCEPT ORIENTATION OF CHOICE SUBMERGED PROBE HORIZONTAL CANCEL SELECT APPROPRIATE UNITS 3 Lift the sensor out of the water and hold it in the air in the same orientation that you selected in the previous step horizontal or vertical Figure 8 Press ACCEPT to continue Figure 8 Lifting the Sensor Out of the Water Horizontal Vertical L ES 4 Follow either the vertical or horizontal procedure below Vertical Orientation Only a Place the sensor under at least 16 cm 6 in of water in a vertical orientation Make sure the sensor is stable and not moving around Press ACCEPT to continue b Carefully measure the depth D1 from the surface of the water to the first weld mark that encircles the sensor body just above the breather vent holes Figure 9 The weld mark indicates the location of the internal diaphragm c Enter the depth D1 using the numeric keypad then press ACCEPT when done Figure 9 Measuring Submerged Depth Vertical Orientation 1 Gray band 2 Breather vents 3 Detachable nose cone 47 Sensor Installation 6 6 Bubbler Horizontal Orientation Only Note Always check the Level Adjust when reinstalling th
172. the incoming message If the two values are not equal an error condition occurs The LRC is calculated by adding together successive 8 bit bytes of the message discarding any carries and then complementing the result The LRC is calculated by summing all values in the ASCII message except for the leading colon and ending lt CR gt lt LF gt E 7 Communication Parameters To successfully communicate with the 950 Flow Meter using Modbus ASCII the communication parameters of the master device must be set at 7 bits Even Parity and 1 Stop bit The baud rate may be configured to any value offered by the 950 Flow Meter 118 SCADA Modbus System Guidelines With the exception of baud rate the communication parameters must not vary from this format E 8 User Memory Customizing The most familiar component of existing SCADA networks today is the Programmable Logic Controller PLC Because the network integrator is most familiar with this type of device the flow meter emulation of an existing PLC simplifies the process of integrating the manufacturer s instrumentation into the SCADA network Modbus ASCII uses a referencing system to identify the various types of memory inputs and outputs Each reference number has a leading digit that identifies its data type discrete input discrete output register input register output followed by a string of digits that indicates its location in RAM Table 40 Table 40 Modbus ASCII Memory Inp
173. the Pager Option must be enabled Pager reporting uses the industry standard Telelocator Alphanumeric Protocol TAP to deliver information to a maximum of three alphanumeric pagers The logger dials your paging service provider and passes the alarm code site ID and a maximum of three pager phone numbers to the service provider automatically The pager service then sends the alarm information to all enabled pagers When contracting with your local pager service provider you must inform them that the 950 Flow Meter conforms to the TAP standard With this information they will be able to configure their equipment to work with the meter 64 Communications Setup 1 Press CHANGE CHOICE to enable the Pager Option Press the ACCEPT 11 00 AM 21 APR 01 MODEM SETUP CHANGE ACCEPT CHOICE PAGER OPTION ENABLED CANCEL CHOICES ENABLED DISABLED 2 Enter the phone number of the paging service If this number is unknown it can usually be obtained by contacting the pager service s technical support department Press ACCEPT 11 00 AM 21 APR 01 MODEM SETUP ACCEPT PAGER SERVICE PHONE NUMBER 555 5555 CLEAR CANCEL ENTRY USE NUMERIC KEYPAD 3 Enter the number of pagers to call when an alarm occurs The 950 Flow Meter will support up to 3 pagers Press ACCEPT 11 00 AM 21 APR 01 MODEM SETUP ACCEPT NUMBER OF PAGERS 3 CLEAR CANCEL ENTRY 4 Enter the phone numbers of the individual pagers that the message will b
174. the flow meter contains a bubbler module and or is operating in freezing to subzero climates you should consider replacing the batteries when the displayed voltage reads 12 VDC Factors Effecting Alkaline Lantern Battery Life Cold Temperatures If the ambient temperature drops between freezing and 20 C the battery pack will experience a 0 to 40 loss in life Although this loss is extensive as the temperature rises to above freezing the battery will recover with an overall minimal degradation to battery performance This of course is dependent upon the length of time the battery is exposed to these temperatures The Alkaline Lantern Battery Pack is not recommended for these applications Use of the Alkaline Battery Box in freezing or sub zero weather may cause a premature Program Complete If the voltage drops to 10 5 VDC or lower the meter may shut itself down and complete the program to protect stored data Steady Flow In conjunction with cold temperatures constant flow in a seasonal climate will keep the air temperature in the manhole around 45 F 7 C If the flow stops then the ambient temperature would tend to equalize with the temperatures experienced above the manhole If the outside temperature is at freezing or less then the effects of the cold conditions listed above may occur High Velocities Sites with velocities running at eight to twelve feet per second will tend to force the flow meter to stay awake
175. threat of temporary submersion you should attach a length of 74 in ID tubing to both the reference port and the intake port barbed fittings Route the ends of this tubing to a safe area that is free from the possibility of submersion Reattach both desiccant cartridges to the tubing with the cartridge openings facing downward to ensure that moisture condensation and or precipitation does not accumulate in the vent openings of the cartridge This precaution will protect the air pump and internal plumbing systems from water damage Do not leave the desiccant cartridges with the vent openings facing up Bubbler Line Port The bubbler line connects from this port to the measurement point in the primary device Push the 1 8 3 17 mm ID vinyl bubbler tubing over the brass barbed fitting No clamps are required 6 6 1 1 Meter End Cable Terminations Bubbler Area Velocity sensors are terminated with a velocity connector and bubbler tube or with bare leads and the bubbler tube Use the bubbler with bare leads at sites where the sensor cable is routed through a conduit 1 At the meter end of the conduit connect the cable to the meter with a junction box Figure 7 in section 6 3 2 on page 42 Connect the bubbler tube to the brass tubing coupler in the junction box Connect another section of tubing from the brass coupler to the top connector on the Intake Port Dryer Canister Connect the velocity leads to the junction box terminals as indi
176. ty When the slave responds to the master it echoes the function code field to indicate a normal response In the event of an error such as parity error LRC error or a request that cannot be handled the slave will not respond and the master will eventually process a time out condition E 5 Data Field The data field of an ASCII message frame consists of n pairs of ASCII characters that represent data sent to or from a slave device flow meter The data field contained in the master request contains additional information that is required by the slave before any action takes place This may include channel register addresses the number of registers to read and the actual byte count in the data field For example if a master requests that the flow meter read the current status of a group of channels function code 03 the data field specifies the starting register and how many registers are to be read If no error occurs the data field of the response from the meter to the master contains the data requested E 6 LRC Field The LRC field of an ASCII message frame consists of two ASCII characters that provide an additional level of error checking to verify the integrity of the communication media The LRC field is one byte that contains an 8 bit binary value The LRC value is calculated by the transmitting device which appends the LRC to the end of the message The receiving device recalculates the LRC and compares it against the LRC value of
177. umeric keypad and then press ACCEPT to complete the analog channel setup 8 4 Alarm Relays 8 4 1 Alarm Relay Connections Note One cable is required for each set of two installed relays Up to four optional alarm relay outputs are available as factory installed options Two relays can be added at a time and each set of two relays share a single interface connector Table 27 Relay 1 amp 2 Connector Pin Assignments Pin Signal Description Wire Color A relay 1 N O normally open green B relay 1 common black C relay 1 N C normally closed white D relay 2 N O normally open green E relay 2 common black F relay 2 N C normally closed white Table 28 Relay 3 amp 4 Connector Pin Assignments Pin Signal Description Wire Color A relay 3 N O normally open green B relay 3 common black C relay 3 N C normally closed white D relay 4 N O normally open green 72 Communications Setup Table 28 Relay 3 amp 4 Connector Pin Assignments Pin Signal Description Wire Color relay 4 common black relay 4 N C normally closed white Rating Form C relays are rated for 10 amps at 120 V ac or 5 amps at 240 V ac resistive load min Normally open and normally closed contacts are available Cable Required Alarm Relay Cable Assembly 25 ft 7 6 m 6 pin connector on one end tinned wire leads on the other end P N 2705 8 4 2 Alarm Relays Pr
178. use a draw down effect Mounting band and probe are not positioned correctly it was working fine then had trouble Relocate the probe Check the mounting band and probe to see if it slipped out of poisiton Troubleshooting the Submerged Depth Only Sensor Problem Cause Solution Depth readings are inaccurate or no change in depth readings Excessive Debris Collection Incorrect calibration Check to see if the unit is calibrated Re calibrate the sensor to the unit units and where not re calibrated Sensors have been swapped between Sensors must be re calibrated each time they are placed on another unit Desiccant is clogged water or debris in the atmospheric reference tube Depth is trending upward because of Replace if the desiccant has turned pink Clean and re calibrate in the diaphragm Depth is trending downward due to debris Remove the plate and carefully clean out the debris Silt is covering the sensor Improper use of sensor mounting band Clean sensor To reduce the likelihood of debris collecting on the cable and mounting band route the cable along the edge of the band and fasten the cable to the mounting band with nylon wire ties The cable should exit the tied area at or near the top of the pipe to keep it out of the flow stream Submerged Depth readings are inaccurate or no change in depth readings Improper calibration Ch
179. ut Output Referencing System Reference indicator Reference Type Meaning Oxxxx discrete output or coil binary 1xxxx discrete input binary 3XXXX input register real 4XXXX output holding register real 6xxxx extended memory register real The memory data is stored in 16 bit words Within the predefined function codes of the Modbus ASCII protocol the data fields are subject to interpretation by the device manufacturer For example the 950 Flow Meter places temperature information in registers 40001 40002 E 9 Modbus ASCII Function Codes Supported Currently the 950 Flow Meter is capable of a read only function to retrieve channel and total flow information All data addresses in the Modbus ASCII message are referenced to zero Therefore a reference to holding register 40001 is addressed as register 0000 The function code field specifies the type of register accessed therefore the 4XXXX is implicit Function 03 Read Holding Registers Reads the register 4X reference contents of the 950 Flow Meter as defined in the tables that follow 119 SCADA Modbus System Guidelines Table 41 Channels Read Holding Register Addresses Name Type Size bits of Registers Start mS Start i Registers Temperature Float 32 2 00 00 40001 40002 Rainfall Float 32 2 00 02 40003 40004 pH or ORP Float 32 2 00 04 40005 40006
180. vered at all times especially during the early morning hours Make sure there is no or little turbulence up to 20 ft away from the sensor Probe is not facing the right direction Install the sensor facing the proper direction to the flow Noise coming in on RS232 ac power lines and 4 20 output lines Disconnect the RS232 ac power line and or 4 20 mA output Power the unit off and on to reset it Velocity Reading Constant if 32 ft s The beveled face of the sensor is covered with sediment algae growth rags etc Clean the sensor After cleaning it may be necessary to reset the unit by disconnecting power for a minute Electromagnetic interference near the meter sensor cable or RS232 connection Make sure there are no electromagnetic interferences Remove interferences or move the meter and sensor cable away from the interferences Mild power surges Reset the unit by disconnecting power for a minute Troubleshooting the pH Probe Temperature Swings Severe temperature swings will affect probe response Very high temperatures can cause the gel in the probe to expand and seep out through the porous Teflon junction and when temperature drops air is sucked in through the junction If the temperature rises again the air expands pushing more gel out the junction This type of cycling will eventually cause probe failure Build Up of Contaminants on Probe Some sites coat the probe with c
181. when noted on the product identifies the location of a fuse or current limiting device This symbol when noted on the product indicates that the marked item can be hot and should not be touched without care This symbol when noted on the product indicates the presence of devices sensitive to Electro static Discharge and indicates that care must be taken to prevent damage to them This symbol when noted on the product identifies a risk of chemical harm and indicates that only individuals qualified and trained to work with chemicals should handle chemicals or perform maintenance on chemical delivery systems associated with the equipment This symbol if noted on the product indicates the need for protective eye wear This symbol when noted on the product identifies the location of the connection for Protective Earth ground OO B Safety Precautions 1 2 Hazardous Locations The Sigma 950 Flow Meter is not approved for use in hazardous locations as defined in the National Electrical Code DANGER Although some Hach products are designed and certified for installation in hazardous locations as defined by the National Electrical Code many Hach products are not suitable for use in hazardous locations It is the responsibility of the individuals who are installing the products in hazardous locations to determine the acceptability of the product for the environment Additionally to ensure safety the installatio
182. will read the depth until liquid reaches from the bottom of the sensor housing In Pipe Zero Deadband Ultrasonic Depth Sensor Connection Table 12 In Pipe Zero Deadband Ultrasonic Depth Sensor Connector Pin Assignments Pin Signal Description Wire Color A temperature red B temperature black C ultrasonic shield D ultrasonic clear 6 2 2 Programming the In Pipe Zero Deadband Ultrasonic Depth Sensor 6 2 3 Beam Angle The in pipe zero deadband ultrasonic depth sensor does not require operator programming unless more than one sensor option is connected to the 950 Flow Meter When more than one sensor option is connected 1 From the Main Menu select OPTIONS LEVEL SENSOR 2 Select Ultra Sonic Sensor using the CHANGE CHOICE soft key then press ACCEPT The narrow beam of sound that emanates from the bottom of the in pipe ultrasonic sensor spreads out at an angle of x12 10 dB as it travels away from the sensor This means that if the sensor is mounted too high above a narrow channel the beam may be too wide when it reaches the bottom of the channel This may cause false echoes from the sides of the channel walls 6 2 4 Calibrating the In Pipe Zero Deadband Ultrasonic Depth Sensor 40 Calibrate the in pipe sensor each time the sensor is installed at a new site Calibrate the in pipe via one of two methods Liquid Depth or Sensor Height Each method has its own advantages and disadv
183. y Cutoff using the numeric keypad Press ACCEPT to continue Set the Velocity Default using the numeric keypad Press ACCEPT Press RETURN to go back to the Setup Menu or the Main Menu key to return to the beginning 6 3 4 Submerged Area Velocity Sensor Calibration 44 Note The data is constant if the difference between the level reading of the flow meter and the independent verification is constant recalibration is not required The manufacturer recommends calibrating the Submerged Area Velocity Sensor when e The sensor is first used e Installing a new or different sensor on a flow meter or input receptacle e The difference between the level reading of the flow meter and the independent verification measurement with a dipstick and ruler is increasing Note Errors are caused by variation in site conditions and measurement abilities These errors may cause slight changes in the difference therefore not indicating a true change in the difference 1 From the Main Menu select OPTIONS ADVANCED OPTIONS CALIBRATION SUBMERGED PROBE Place the sensor flat on a table top or floor with the sensor the plate with holes facing down onto the surface Press any key to continue Sensor Installation 6 4 Low Profile Velocity Only Sensor The Low Profile Velocity Only Sensor is an extremely low profile velocity sensor It does not measure depth Therefore it is usually used in conjunction with the in pipe ultrasonic

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