FLOW HUNTER
Contents
1. CTR10 CTR11 lsa 4 i PSS ges eg a m E 2 2 z Z x a amp m E E Communications CTR14 The RS232 422 is factory set to The data rate is fixed at 9600 baud The information format is an ASCII string of characters that is terminated by a ZERO character before the information is repeated 8 Data bits 1 Start bit 1 Stop bit No Parity The connections are as shown 20 Printed Circuit Board PCB RS232 TX RS422TXA RS232 RX RS422 RXA GND 0V RS422 TXB RS422 RXB re Printer Low Voltage Power Connections CTR4 The unit can be powered from either 24 Volts AC or 24 Volts DC The details of the Printed Circuit Board PCB low Voltage power connections are THIS MUST BE FACTORY SET 24 V AC 24V DC 24 V AC 0V DC 4 20mA Output CTR12 Printed Circuit The unit can be provided with a 4 20mA output option Board PCB The terminal connections for this are shown below 0V w 5 A O zZ lt G a a amp 1 i 21 Installation With Remote Driver Electronics Note Remote Driver If you have specified the distance from the instrument Up to 5 000 ft to the transducer less than 50m the instrument supplied will have an integral transducer driver board built in Up to 150 ft 50m max distance from o o Trans2. i Process Instrumentation FLOW HUNTER Ultrasonic Open Channel Flow Measurement User Manual Security Code Default 1 ECHO Process Instrumentation Inc Ship to 70 6 Ave Mail to PO Box 800 Shalimar FL 32579 USA Phone 850 609 1300 Fax 850 651 4777 Email info echopi com Website www echopi com Copyright Notice August 2009 1 0 2 0 3 0 APPENDIX A APPENDIX B APPENDIX C APPENDIX D CONTENTS Introduction Operating and Programming 2 1 Run Mode 2 2 Main Menu 2 2 1 Quick Set up 2 2 2 Set up relays 2 2 3 Advanced Set up 2 2 4 Reset Totalizer 225 Review Set up Mounting Instructions 3 1 Transducer Mounting 3 2 Correct Location 3 3 Blanking Distance Deadband and Safety Procedure Primary Measuring Device Types and Dimensions Overview of Terminal Connections Flow Hunter Connections and Wiring All Terminal Connections Fault Finding Page 23 1 0 Introduction The Flow Hunter instrumentation unit is for use in conjunction with the Xducer 06 non contact ultrasonic sensor head The Flow Hunter is a fully programmable open channel flowmeter conforming to US and UK BS3680 calculations for the following channels Model Liquid Xducer 06 d Time of Flight V Notch Weir Rectangular Weir Rectangular Flume 25 Point Table X Y Parshall Flume Palmer Bowlus Flume Manning Equation Pipe Volumetric Flow ii Total Flow iii Distance iii Te
3. using a multimeter check the resistance of the thermocouple It should read between 400 ohms and 100K ohms depending on the temperature being measured 10K ohms 25 deg C Display fluctuates Periodic lost echo check all factors above Totalizer gives lower than expected readings Low flow rate operating outside the BS standards Increase flow rate through weir 24
4. EEPROM gt ANS YES NO or EXIT Blanking Distance Extend the Blanking Distance to ignore any false echoes Accept Data YES saves the data to EEPROM gt ANS YES NO or EXIT Flow Chart Parshall Flume For dimensional definitions see Appendix A Program Parshall Flume Select Device V NOTCH WEIR RECTANGULAR WEIR RECTANGULAR FLUME TABLE X Y PALMER BOWLUS MANNING PIPE Select Size Select Size 1 2 3 6 9 12 1 5 2 3 4 5 6 8 12 Select Units L m m3 m L h m3 h L d No Flow Distance inches Enter the distance from Xducer Face to Zero Flow Max Flow Height inches Enter Max Head or Level for Max Flow to be calculated Calculated Span xxxx xx units Span or Mox Flow is automatically calculated amp shown gt ANS YES NO or EXIT Blanking Distance Extend the Blanking Distance to ignore any false echoes Accept Data YES saves the data to EEPROM gt ANS YES NO or EXIT Flow Chart Palmer Bowlus Flume For dimensional definitions see Appendix A Program Palmer Bowlus Flume Select Device V NOTCH WEIR RECTANGULAR WEIR RECTANGULAR FLUME TABLE X Y PARSHALL FLUME Select Size Select Size 4 6 8 10 12 15 18 21 24 27 30 Select Units GPM GPH GPD Us m3 s L m m3 m L h m3 h Ud m3 d EXIT No Flow Distance inches Enter the distance from Xducer Face to Zero Flow Max Flow Height inches Enter Max Head or Level for Max Flow to
5. RS485 address and Baud rate Flow xx xx GPM At this point the Flow Hunter will start to fire the Ultrasonic Head and display the flow rate and air temperature using the factory programmed default channel dimensions Air Temp xx F This is called Run Mode and is the mode the Flow Hunter uses to display the volumetric temperature totalizer and distance To program the Flow Hunter the user is presented with several menus each of which contain numerous options that can be toggled on off or a numeric value entered The menus are all presented on the display as a series of statements which cycle round each time the UP or DOWN push button is pressed To select a particular option the user has to press the ENTER button when the relevant menu option is displayed For all numeric values the menu statement displays the currently programmed value and allows the user to increase or decrease this value by pressing and holding UP or DOWN Pressing ENTER will enter the new value into the system and overwrite the old value If the old value is on the display and the user presses ENTER it has the effect of leaving the number unchanged The push buttons automatically repeat if held pressed The user will see the numbers displayed change slowly at first then increase in speed every few seconds as long as a push button remains held down The Flow Hunter also emits a short bleep as an acknow
6. Security Code number to be entered The factory pre set code number is indicated on the front cover of this manual 1 but this can be changed by the authorised user at any time Use the UP or DOWN buttons to change the displayed number then press ENTER to enter the code If no code is entered within 12 seconds the Flow Hunter returns to run mode If an incorrect Security Code is entered this error message is displayed and the unit returns to Run Mode 2 2 Main Menu When the correct security code has been entered the Flow Hunter stops firing the head turns off all the relays and displays the main menu This is where the system set up and calibration parameters can be entered The UP and DOWN buttons move the Flow Hunter through the following menu options Press ENTER to select the required option Main Menu Run Mode Main Menu Quick Setup Main Menu Setup Relays Main Menu Advanced Setup Main Menu Reset Totalizer Main Menu Review Setup Returns the Flow Hunter to Run Mode Programs the flumes weirs lookup table and the ultrasonic head parameters Programs the relays parameters Programs the temperature new password and RS485 RS232 data communications address Resets the Totalizer to zero Displays the final parameters programmed as a list Each of the above menus should be programmed as appropriate when first installing the Flow Hu
7. LL FLUME PALMER BOWLUS MANNING PIPE Select Uni MGD GPM GPH GPD Us m3 s L m m3 m L h m3 h Ud Throat Width inches Enter the throat or narrowest width of the Rectangular Flume Channel Width inches Enter the width of the Approach Channel before the Flume Throat Length inches Enter the Throat or narrowest section Length No Flow Distance inches Enter the distance from Xducer Face to Zero Flow Max Flow Height inches Enter Max Head or Level for Max Flow to be calculated gt XX XX Calculated Span xxxx xx units Span or Max Flow is automatically calculated amp shown gt ANS YES NO or EXIT Blanking Distance Extend the Blanking Distance to ignore any false echoes Accept Data YES saves the data to EEPROM gt ANS YES NO or EXIT Flow Chart X Y Table Program Table Select Device V NOTCH WEIR RECTANGULAR WEIR RECTANGULAR FLUME PARSHALL FLUME PALMER BOWLUS MANNING PIPE Select Units GPH GPD L s m3 s t m m3 m L h m3 h L d m3 d EXIT No Flow Distance inches Enter the distance from Xducer Face to Zero Flow Max Flow Height inches Enter Max Head or Level for Max Flow to be calculated table entries Enter the number of X Y points to plot Head Flow Ignore Zero and Max Flow it has been inputed automatically Points 100 and Enter Flowrate UOM Units of Measurement for each Point n proportionally Point 1 UOM Point n UOM Accept Data YES saves the data to
8. be calculated Calculated Span xxxx xx units Span or Max Flow is automatically calculated amp shown gt _ANS YES NO or EXIT Blanking Distance Extend the Blanking Distance to ignore any false echoes Accept Data YES saves the data to EEPROM gt ANS YES NO or EXIT Flow Chart Manning Equation PIPE Program Manning Equation Pipe Select Device V NOTCH WEIR RECTANGULAR WEIR RECTANGULAR FLUME TABLE X Y PARSHALL FLUME PALMER BOWLUS Inner Diameter inches Slope AY AX Enter the Pipe Inlet Outlet Vertical Ht amp Horizontal Length Roughness Enter the Manning Coefficient of Roughness for the Pipe Liner Select Units L m m3 m L h m3 h L d No Flow Distance inches Enter the distance from Xducer Face to Zero Flow Max Flow Height inches Enter Max Head or Level for Max Flow to be calculated Calculated Span xxxx xx units Span or Max Flow is automatically calculated amp shown gt ANS YES NO or EXIT Blanking Distance Extend the Blanking Distance to ignore any false echoes Accept Data YES saves the data to EEPROM gt ANS YES NO or EXIT 2 2 2 Setup Relays The Set up relay menu is where the programmable relay information is entered into the Flow Hunter The relays can be programmed via the Set up relay option of the main menu There are 4 relays on the Flow Hunter of both Normally Open NO and Normally Closed NC configuration The 4 relays on th
9. c Relay 3 The L E relay should be used as a fail safe relay connected in series with the other 4 Raai Relay 4 programmable relays The ensures that all power to external equipment is removed when the Flow Hunter is not in the Run Mode or if there is a power failure to the unit If the L E relay is not used any equipment connected to the NC connections of the other relays will run if power is removed because these relays will de energise i e NC contact is made 19 Transducer Connections from Encl The connections for the ultrasonic head is shown below Normally the head uses four wires red green white and white as indicated in the table below The THERMISTOR connections relate to the temperature sensor associated with the ultrasonic head Connection Thermistor Thermistor Head Cable Color Red Green Screen Blue Yellow White OR Temperature sensor Black P re to Remote Transducer Driver Printed Cicuit Board PCB Note Ensure connector block from transducer is correctly wired CTR10 CTRI11 B gt pet ee f gt SO BF gw a m ae a 2 Z 2 T E E Transducer Connections with Internal Transducer Driver Standard Connection Thermistor TM Thermistor TM Head Cable Color No Connection No Connection Shield Red Black White Temperature sensor Green Temperature sensor Printed Circuit Board PCB
10. ducer to Remote Driver Instrumentation L Transducer ch o O Wiring Connection For Remote Transducer Driver O Q From Transducer To Instrument CONNECTION ID To Instrument TH1 Instrument White Temperature sensor TH2 Instrument Black Temperature sensor TRIG Instrument Yellow RET Instrument Blue GND Instrument Green 15V Instrument Red From Transducer X1 Transducer Red SCN Transducer Screen X2 Transducer Black TH1 Transducer Green Temperature sensor TH2 Transducer White Temperature sensor Cable Type and Cable Installation From Instrument to Remote Transducer Drive Electronics Defence Standard 61 12 Sub miniature Cable Specification 16 2 6C Itis essential to use this cable type or cable with cores in the same orientation Failure to do so will cause fluctuating readings due to cross coupling of transmit and receive signals From Transducer To Remote Transducer Drive Electronics 4 Core Screened twisted Pair with Integral Drain Wire And Individually Screened Impedance 54 ohms Capacitance core core 115pF General Notes Where multiple sensors are connected to the instrumentation ensure that the cables are kept at least 12 inches apart to prevent magnetic coupling Always ensure grounds and screens are connected 22 Appendix D Fault Finding Ringing When in the transmit mode ultrasonic transducers conve
11. e ECHO Flow Hunter can be programmed individually to switch on the following choices Flow 1 High flow LEVEL alarm based on a maximum level value 2 Low flow LEVEL alarm based on a minimum level value Sampler 3 Pulsed every xxx ft Once you have selected Set up relay you may cycle through these choices until you select one of them You will then be asked to enter the appropriate values Main Menu Setup relay Relay Menu Relay Menu Relay Menu Relay Menu Level switch Disable relay Exit Relay Number Relay Number Relay Number y y y Main Menu Choice Relay 1 Choice Relay n Choice Relay 1 Setup Rday Main Menu Setup rday 2 2 3 Advanced Set up In this menu the settings of the unit address RS485 only temperature compensation operator security code and Lost Signal settings can be changed The menu structure is displayed below Main Menu Advanced Setup vy v v v Unit Number Select temp New Password Vv v v v Unit Address Temp ternal emp is external Change Password Change Password ANS YES ANS N gt XX XX Change NO Change YES Tank temp deg C Tank temp deg C Enter New Code gt XX XX gt XX XX gt XX XX Saving data to EEPROM Main Menu Advanced Setup 10 4 20mA Output The unit is provided with a 4 20mA isolated output as standard The 4 20mA output is automatically scaled to the selected span max flow height you have pro
12. es 0 25m All ultrasonic transducers have a blind area called the deadband Within this area the sensor cannot detect the true echo This should be borne in mind when setting up the unit since if you allow your liquid to fill into this area the instrumentation unit will not return lost echo but give an erroneous reading which relates to a multiple echo which in the time base is perceived to be outside the deadband region In order to prevent this occurrence you should always assign one of the relays to a high alarm condition The level of this high alarm must be below the dead band zone which is given in inches in the Quick Setup menu for each head type It is recommended that you make this alarm setting equal to the distance of the deadband plus 20 For example an Xducer 06 head with a deadband of 9 8 inches should have a high level alarm set at a distance of 12 inches from the surface of the transducer head A safety margin of 2 inches above the blanking zone should be sufficient for most applications 14 Appendix A Channel types and dimensions Transducer Location For Rectangular Flumes Ultrasonic Transducer a Stilling Well optional transducer location A A Dead Band No Flow 100 X Distance Span FLOW gt Y_ 0 Y Side Elevation Throat Width _ Channel Width gt Yo pae 3 to 4 x Span Ultrasonic transducer Throat Length L Approach Width B Transducer Locat
13. grammed e g If you have programmed a span of 50 GPM then the unit will output 4mA as Zero 0 flow and 20mA as max flow 50 GPM Lost Echo The Lost Echo function is signalled on the 4 20mA output as OmA i e Open Circuit To ensure the unit fails to a safe condition under power loss or malfunction the lost echo function must always be used NOTE The velocity of sound changes by 0 18 per C change in temperatures 11 2 2 4 Reset Totalizer It will display Clear Totalizer Change Select YES and press ENTER password 120 It will then show Totalizer Clear 2 2 4 Display Set up In this menu the settings of the unit can be confirmed Press any key to scroll through the display it will loop back to Review Setup at the end This is a useful way to view that all programmed parameters have been correctly entered 3 0 Mounting Transducer Location Correct positioning of the sensor is vital if accurate results are to be obtained A basic error in installing the sensor will cause inaccuracies in all other aspects of flow metering The sensor must be held rigidly over the channel and directed towards the liquid face iii Locate the sensor at least 18 inches above the maximum level Ensure that the ultrasonic beam has a clear path to its target and is not going to strike objects on the wall of the channel Fix the sensor in a vertical position Hand tighten the transducer to avoid ringing in the
14. h a junction box maintain continuity of the screen NOTE You will have been provided with the correct requested length of transducer cable for your application should you wish to extend this cable length it should only be done by adding to the existing length through an IP68 gland Always use the nut provided and insert the damping washers Do not over tighten the nut as ringing may occur Use a sprit level or a plumb line to ensure the transducer is aligned normal to the reflecting surface 13 3 2 Correct Location The transducers should be placed such that the ultrasonic beam does not reflect from interfering structures during it s flight path The beam spread for the ultrasonic wave as it travels from the transducer is 6 degrees Ensure that at the maximum distance to be measured the beam does not collide with interfering structures 3 3 Blanking Distance Deadband and Safety Procedure f Transducer Deadband X Fixed x Blanking Distance X 20 Safety Zone There may be instances where obstructions in the channel give rise to false echoes If such obstructions are above the maximum level to be measured then they may be gated out by instructing the computer to ignore any return echo in the flight path up to such an obstruction This is performed in the calibration mode by programming in a blanking distance The blanking distance programmed should be the distance from the transducer to 9 8 inch
15. ion For Parshall Flumes Mount the transducer 2 3 L upstream L Length ofThroat z Flow Upstream fe Flow Downstream aa A 15 Transducer Location For Weirs Inlet Section Outlet Section Approach Width B Weir Plate Position transducer on center line Outlet gt Dead Band 4 No Flow Distance Max Flow Height 100 w Head Range i Section A A For V Notch gt Dead Band No F low J Distance Max Flo Height Vv i A Sill Head Height Range Vv lt lt Sill Width 16 Appendix B Overview of Terminal Connections for Flow Hunter All connections to the unit are located on the rear section of the unit housing The Ultrasonic Transducer has been supplied with 10m standard cable unless ordered with longer length with the wires labelled see Connections and Wiring A weatherproof IP68 gland must be used to make any termination s or when extending cable length Access into the transducer will invalidate the guarantee All wiring must be to the latest IEEE regulations Power Connections The unit can be powered from mains 110 230VAC 24VDC is ordered separately The details of the Power connections are given in the diagram below The Power drawn is 5 Watts Fuse Rating 20mm 1A Anti surge Relay Connections There are 4 programmable relays These relays have both normally open NO and normally closed NC contacts so that they can be used in any configuration The ratings fo
16. ledgement of a key press or when the auto repeat function is in use default is OFF 2 1 Run Mode The Flow Hunter will normally remain in Run Mode displaying the flow information All the relay outputs are active during this mode Depending on the options programmed pressing the UP or DOWN buttons will scroll the display through the following Flow xx xx GPM Air Temp xx F Distance xx xx ft Air Temp xx F Total xx xx Gal Air Temp xx F Displays the flow rate and air temperature in the Channel The flow is displayed in Gallons per Minute GPM or in other pre set units and the air temperature in degrees Fahrenheit F Displays Distance from the transducer face to the water If the PMD is empty then this value is No Flow Distance Displays the totalized flow up to 999 999 99 Gal All the information regarding the shape and size of the channel the head offset etc are programmed into the Flow Hunter in the calibration menus If the Ultrasonic Head should fail to receive echo s from the flow surface the Lost Echo error message is displayed If the echo is lost for longer Lost Echo Air Temp xx F Security Code x INVALID ENTRY than 20 seconds user settable the Lost Echo Relay will then be de energised The relay coil is re energised when the echo returns To bring the Flow Hunter out of Run Mode press the ENTER button The unit will then ask for the
17. m to correct temperature setting or install new temperature sensor Display shows lost echo Transducer incorrectly wired check wiring diagrams against installation Poor wiring connection ensure all wires are securely connected Poor Earth meter earth connection and rewire if necessary Liquid level has entered the blanking zone and or the near field reduce level until reading returns see Section 3 2 Stilling well has curved bottom and is empty this will cause the ultrasonic signal to bounce around the well arriving back at the transducer outside its permissible time for the set height ensure transducer is positioned as central as possible and the well always has liquid present below the transducer Foam present foam absorbs ultrasound reposition transducer away from foam Placing in a stand stilling pipe pipe will suffice provided foam does not penetrate the pipe Temperature thermals foam occasionally present use stand pipe 23 Display shows periodic lost echo Large undulating surface associated with very turbulent liquids causing unfavourable reflecting surface reposition transducer abo ve flattest surface or in the case of liquids use a stilling pipe Transducer not mounted to the normal reflecting surface using a spirit level realign transducer Ultrasonic beam occasionally catches edge of weir tank or flume Lower transducer or place in stilling pipe Temperature fluctuations Damage to thermocouple
18. mperature The Flow Hunter measures The head measures the time of flight of an ultrasonic pulse to travel from the sensor to the reflecting surface and back to the transducer This information is transmitted to the instrumentation unit where it is converted into distance and flow information distance d Time of Flight x Ultrasonic Velocity 2 Figure 1 The instrumentation unit contains a versatile fully programmable computer which enables a number of processing functions to be carried out These functions must be configured on first power up of the system This is known as CALIBRATION Programming the unit is simple as the unit is fully menu driven and prompts the user for his preferred choice Figure 1 shows the facia layout of the Flow Hunter On the front panel facia you will find the LCD display the Alarm Set LED sto the right and the Programming Keys 2 0 Operation and Programming When installing the Flow Hunter first install the transducer above the channel as per the instructions in Appendix A When power is first applied to the Flow Hunter it will show the following messages on the LCD display quickly in succession This means the Flow Hunter is retrieving the system set up data from the non volatile memory Retrieving data from EEPROM ECHO PI Inc Flow Hunter Displays the software version number X XX Addr 0 Baud 96 32K CFG 2000 System information concerning the unit s
19. nter Definition of Terms No flow distance Max Flow Height Span Blanking Distance Distance from sensor face to zero 0 flow point in Primary Measuring Device in inches Used to calculate the span and fixes the 4mA output value to 0 Distance from zero 0 to maximum 100 HEAD Level height in inches corresponding to maximum flow This is used to calculate the flow span and fixes the 20mA output value to 100 Calculated flow span max flow min flow zero This calculates the Max Flow based on the Max Flow Ht given This should agree with your flow calculations Minimum 9 84 inch 0 25 meter Should be increased as required to overcome interfering objects structures between the sensor and maximum flow height Such interference can lead to a false echo 2 2 1 Quick Set up The Quick Set up menu is where the Primary Measuring Device and the ultrasonic transducer parameters are entered into the Flow Hunter Flow Chart V Notch Weir For dimensional definitions see Appendix A Program V Notch Weir Select Device RECTANGULAR WEIR RECTANGULAR FLUME TABLE X Y PARSHALL FLUME PALMER BOWLUS MANNING PIPE Select one 120 deg 90 deg 60 deg 53 deg amp 8 mins 45 deg 30 deg 28 deg amp 4 mins 22 deg amp 30 mins EXIT Select Units MGD GPM GPH GPD L s m3 s L m m3 m L h m3 h Ud m3 d EXIT No Flow Distance inches Enter the distance from Xducer Face to Zero Flow Max Flow Heigh
20. r the relays are as follows Max Switched current and voltage 1A 24VDC Electrical life at full load min 8 x 10 operations Mechanical life min 5x10 operations Communications The RS232 is factory set to 8 Data bits 1 Start bit 1 Stop bit No Parity The data is fixed at 9600 baud The information format is an ASCII string of characters that is terminated by a ZERO character before the information is repeated 17 Connections and Wiring Relay1 RLI Common COM Normally Closed NC RL 1 COM Normally Open NO N C N O Relays COM Relay2 RL2 RLn N C Common COM N O Normally Closed NC Analog 4 20mA VE Normally Open NO OV VE empty 4 20mA Isolated oV empty vee SCR SHIELD eee Xducer RET RED TR BLACK Transducer SCR Shield TM WHITE TM GREEN RET RED TR BLACK TM WHITE TM GREEN Power Supply Supply L LIVE N NEUTRAL E EARTH Ground Cable type 4 Conductor Cable Shielded Max current per Core 1A Max Temp 70 deg C Transducer Remote Driver If the transducer cable exceeds 50m 150 a remote driver interface box is required for extended runs The connection to this driver is via a 6 core cable type Defence Standard 61 12 Sub miniature Cable Specification 16 2 6C See page 22 Connection details are printed on the rear of the units Appendix C All Terminal Connections for Flow Hunter All connections to the unit are located in the lower section of the unit housing Access to this area doe
21. rt electrical energy into mechanical energy causing the transducer to vibrate like a loudspeaker Most of this energy is converted into an ultrasonic acoustic wave but some is transmitted into the transducer housing This is analogous to striking a bell whereby you hear a sound but also you can observe the bell mechanically RINGING If this is excessive it will take a long time to die away and can still be present when the return echo arrives back at the transducer In such cases the transducer cannot recognize the returning echo and as a result the system cannot calculate range Ringing can be recognised by a higher than expected level indicated To reduce ringing always use gaskets and never over tighten bolts Hand tighten the transducer Increasing the blanking distance beyond the ringing time will also lock out its effect No Display showing FMP not firing Transmit Pulse lt m_ _ Transmit Ringing Time R y Ringing eceive lt gt Damping gt Return echo A gt Return echo Ringing Check supply to FMP Carefully unscrew the four screws and remove facia label plate and check fuse if blown replace with 1 0 Amp anti surge fuse Display shows higher than expected reading Ringing of transducer check bolts have not been over tightened and the damping washer is fitted False echo from object in transmission path reposition transducer or extend blanking distance Velocity of sound not set correctly re progra
22. s not invalidate the guarantee All wiring must be to the latest IEEE regulations The unit supply voltage must be provided via a double pole spur Mains Connection The units are factory set to operate from either 115V or 230V 50Hz mains This is indicated on the CTR3 rating label adhered to the unit Printed Circuit Board PCB Fuse Rating 20mm 250V 250mA Anti Surge LINJE The diagram shows the connections for Live Neutral and Earth a gt TE gt a z Z Relay Connections There are 4 programmable relays and 1 lost echo relay that are available to external circuitry These relays have both normally open NO and normally closed NC contacts so that they can be used in any configuration The ratings for the relays are as follows Max Switched current SA Max Switched voltage 30V DC 250V AC com NC Electrical life at full load min 8 x 10 operations NO Mechanical life min 10 operations The connections for the relays are shown below CTR5 CTR6 CTR7 CTR8 CTR9 che LOST Aes Ciruit RELAY 1 RELAY 2 RELAY 3 RELAY 4 ECHO 0 PCB 225 225 228 2252 6 e Q Q Q e Lost Echo Relay Normal procedure for the lost echo relay would be to connect the NO and COM terminals since this relay is energised during normal operation of the transducers On a lost echo condition the relay is de energised o Relay 1 o Relay2 5s
23. t inches Enter Max Head or Level for Max Flow to be calculated Calculated Span xxxx xx units Span or Max Flow is automatically calculated amp shown gt ANS YES NO or EXIT Blanking Distance Extend the Blanking Distance to ignore any false echoes Accept Data YES saves the data to EEPROM gt ANS YES NO or EXIT Flow Chart Rectangular Weir For dimensional definitions see Appendix A Program Rectangular Weir Select Device V NOTCH WEIR RECTANGULAR FLUME TABLE X Y PARSHALL FLUME PALMER BOWLUS MANNING PIPE Select Units GPH GPD L s m3 s L m m3 m L h m3 h U d m3 d EXIT Sill Width inches Enter the width or crest length of the Rectangular Weir Approach Width inches Enter the width or crest length of the Channel Suppressed 0 Sill Height inches Enter the height of the Rectangular Weir No Flow Distance inches Enter the distance from Xducer Face to Zero Flow Max Flow Height inches Enter Max Head or Level for Max Flow to be calculated Calculated Span xxxx xx units Span or Max Flow is automatically calculated amp shown gt ANS YES NO or EXIT Blanking Distance Extend the Blanking Distance to ignore any false echoes Accept Data YES saves the data to EEPROM gt ANS YES NO or EXIT Flow Chart Rectangular Flume For dimensional definitions see Appendix A Program Rectangular Flume Select Device V NOTCH WEIR RECTANGULAR WEIR TABLE X Y PARSHA
24. winter Try to avoid situations where the temperature sensor is exposed to sunlight especially at dawn and evening In the event of the transducer being exposed to prolonged strong sunlight a simple heat shield erected above the sensor will ensure correct temperature compensation in the most severe conditions A suitable shield is available from ECHO PI 12 3 1 Transducer Mounting It is recommended that the Ultrasonic transducer is mounted on a bracket above the channel to overcome the deadband of the transducer as follows Xducer 06 Deadband 9 84 0 25m This arrangement allows the transducer to cover the full operating range The top of the sensor is provided with a 1 NPT thread allowing it to be bolted to a suitable bracket When tightening the transducer securing screw it is important that the natural turning moment of the transducer is resisted with a suitable open ended spanner Failure to observe this precaution could result in the damage of the transducer Hand tight ONLY UNDER NO CIRCUMSTANCE SHOULD THE BODY OF THE To Remote Transducer Drive or Instrument 1 NPT Thread L a 3 75 _vY 2 75 Integral TRANSDUCER BE CLAMPED EITHER WHILE IT IS BEING conan SECURED OR WHEN IN USE NOTES A Support and restrain sensor cables to avoid damage B Route sensor cables away from power cables and other sources of interference C Where cables pass throug
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