Display - Service, Support
Contents
1. The Milltronics Utilities Software expands the human interface capabilities of the OCM 3 as compared to that provided bv the simple use of the infra red programmer Utilities Software Programmer remote OCM 3 programming local programming remote OCM 3 display local display saving OCM 3 program parameters retrieving log data creating spread sheet data log file creating ASCII text data log file emulating serial printer graphic flow rate display PL 505 105 The OCM 3 Utilities software provided by Milltronics uses XON XOFF to ensure communication reliability The software is written to be executed on an IBM PC compatible computer The standard keyboard emulates the OCM 3 programmer Pressing the keys corresponding to those displayed on the programmer will activate the same function see Start Up Keypad In addition special functions are provided using the w and v keys found on keyboard For additional information refer to the README DOC file provided on the disk ocm m mininin HOO OO PL 505 106 Custom Programming and Third Partv Communication Program Users who wish to write their own software to communicate with the OCM 3 are urged to implement a fullv buffered interrupt driven serial link incorporating XON XOFF Some users however will not have the capacitv for such an undertaking Those users may still communic2. where q flow rate cal flow rate at maximum head h head maximum head Ce discharge coefficient for head Cecal discharge coefficient for maximum head Refer to Operation Flow Calculation PL 505 70 BS 3680 THIN PLATE V NOTCH WEIR transducer ds a The transducer must be above the maximum head by at least the blanking value P47 PL 505 71 RECTANGULAR WEIR CONTRACTED 03 8 U parameters required UO crest width b obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q Kx b 0 2h xh where q flow rate h head K constant RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q Ocal X b 0 2h b 0 2heal x where q flow rate cal flow rate at maximum head h head hcai maximum head Refer to Operation Flow Calculation PL 505 72 RECTANGULAR WEIR CONTRACTED A transducer a 4 to 5 x hmax The transducer must be above the maximum head by at least the blanking value P47 PL 505 73 ROUND PIPE P3 9 based on the Manning Formula U parameters required U0 pipe inside diameter D U1 slope fall run s U2 roughness coefficientn obtain from manufacturer s specifications Refe
3. N N r T L Trapezoidal Cipolletti Sutro Proportional UQO 1 UO 1 5 symmetrical or asymmetrical For rated flows under free flow conditions the head is measured upstream of the weir plate at a minimum distance of 3 times the maximum head i e where the liquid surface is not affected by drawdown The transducer must be above the maximum head by at least the blanking value P47 PL 505 54 SIMPLE EXPONENTIAL DEVICES P3 0 KHAFAGI VENTURI transducer b front side For rated flows under free flow conditions the head is measured 15 cm 6 upstream from the beginning of the converging section The transducer must be above the maximum head by at least the blanking value P47 PL 505 55 SIMPLE EXPONENTIAL DEVICES P3 0 TYPICAL PARSHALL FLUME Cc F A plan transducer a gt di 0 i head i front side For rated flows under free flow conditions the head is measured at 2 3 the length of the converging section upstream of the beginning of the throat section The transducer must be above the maximum head by at least the blanking value P47 PL 505 56 SIMPLE EXPONENTIAL DEVICES P3 0 TYPICAL LEOPOLD LAGCO throat l j M 4 gt SS TA a plan 4 transducer e converging diverging point of measurement 0
4. board B 00000 D CURRENT oe 83 TRANSOUCER lt MILEFRONIGS OCM II BOARDB MADE IN CANADA 9 10 11 1213 14 18 16 17 18 19 20 21 22 23 24 25 26 27 28 29 7 sov POWER SEEINSTRUCTION POSITIONSW1 FOR LILU ILLI ea RLI RL2 RLS BOOKFORRELAY any 100 115 200 230V OPERATION 50 60Hz 20 VA N All field wiring must have insulation suitable for at least 250 V AN Hazardous voltage present on transducer terminals during operation dc terminals shall be supplied from SELV source in accordance with IEC 1010 1 Annex H Relav contact terminals are for use with equipment having no accessible live parts and wiring having insulation suitable for at least 250 V The maximum allowable working voltage between adjacent relav contacts shall be 250 V PL 505 SVSTEM DIAGRAM OCM 3 MA output 3 relav output 1 auxiliary input 1 velocitv input 1 RS 232 WLLL Milltronics transducer see Specifications Milltronics TS 2 temperature sensor customer device customer alarm pump or control device customer device customer device customer device Milltronics BIC II Buffered Interface Converter Maximum system capability Not all components or their maximum quantity may be require
5. 46 P27 MA damping secs P28 MA options emulator tracking 0 don t track emulator 1 track emulator P29 fail safe time secs P30 fail safe analog mode 0 hold last value 1 assume value in P31 P31 fail safe analog mA default value P32 totalizer multiplier O x 1 1000 0 001 1 gt x 1 100 0 01 2 x 1 10 0 1 3 x1 4 x10 5 x 100 6 x 1000 P33 flow rate display decimal point 0 no decimal places PL 505 47 P34 printer mode 0 gt never print 1 interval to be in minutes 2 interval to be in hours 3 print once each dav P35 printer timing P36 measurement interval 0 1 sec 1 15 sec 2 30 sec 3 1 min 4 5 min P37 serial data rate 0 300 baud 1 600 2 1200 3 2400 4 4800 5 9600 6 19200 P38 site number PL 505 48 P39 840 P41 PL 505 data logging rate fixed 0 1 min 3 30 1 5 4 60 2 15 5 24hr variable condition 6 15 1 min flow min 19 60 1 flow 7 15 5 20 gt 60 5 8 30 1 21 24hr 1min 9 30 5 22 24hr 5min 10 60 1 23 24hr 15 min 11 60 5 ti 24 15 1min head 12 gt 24 hr 1 min 13 24 5 min 14 gt 24 15 min 15 15 1min flow 16 15 5 17 30 1 18 30 5 log rapid setpoint P39 variable logging condition flow min flow head log normal setpoint P39 variable logging condition flow min flow head 49 25 15 5 26 30 1 27 30 5 28 60 1 2
6. BS 3680 U Flume P3 4 U parameters required U parameters calculated U0 approach diameter Da U4 Cv U1 throat diameter D U5 Cd U2 hump height p U6 Cu U3 throat length L U7 A obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 2 3 gt x 93 x Cv x Cu x Cd x D x h where q flow rate Cv velocity coefficient g gravitational acceleration Cu shape coefficient b throat width Cd discharge coefficient h head RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qoal X CU Cucal X Cd Cdeal x Cv Cvcal x h hoai 7 where q flow rate Qcal flow rate at maximum head h head maximum head Cu shape coefficient for head Cucal shape coefficient for maximum head Cv velocity coefficient CVcal velocity coefficient for maximum head Cd discharge coefficient for head Cdcal discharge coefficient for maximum head Refer to Operation Flow Calculation PL 505 64 BS 3680 U FLUME transducer i 0 head h The transducer must be above the maximum head by at least the blanking value P47 PL 505 65 BS 3680 FINITE CREST WEIR P3 gt 5 U parameters required U parameters calculated UO crest width b U3 C
7. The absolute method is not applicable to the following Palmer Bowlus flume H flume DISPLAY The normal display during operation is the Flow and Total Display F2 flow rate field relay no echo field 3 ji FLOW 0 00 Vs RELAY 123 TOTAL 00000000 x1 STATE O1x totalizer field status field PL 505 28 Flow Rate Field flow rate units P5 FLOW 0 00 TOTAL Totalizer Field FL A l TOTAL 00000000 x1 total multiplier P32 Relay No Echo Field relay identification under loss of echo condition NO RELAY 123 ECHO will TATE alternately flash Status Field EL STATE O1 relay status 0 relay de energized 1 relay energized alarm state indicated when flashing The OCM 3 provides illumination for the LCD for easier viewing of the display Illumination can be set P14 to be normally on or off or automatic When automatic is selected the lighting will automatically go on when keypad activity is sensed and then extinguish after 15 seconds of inactivity a Y For battery operation set display lighting to off or auto DAMPING The OCM 3 provides two separate damping functions reading and mA output Zero or no damping allows fastest response while high or 100 provides the slowest response The damping is usually set to provide a reliable response without sacrificing stability The reading damping P13 dampens only the flow rate reading of the Flow and Total d
8. obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 1 1000xBxhxV where q flow rate in I sec B channel width in cm h head in cm V velocity in cm sec RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q cal X A Acal X V Vcal where q flow rate cal flow rate at maximum head h head maximum head v velocity Veal velocity at maximum head Refer to Operation Flow Calculation PL 505 82 RECTANGULAR AREA X VELOCITV transducer The transducer must be above the maximum head by at least the blanking value P47 PL 505 83 A TRAPEZOIDAL AREA X VELOCITY P3 14 U parameters required U parameters calculated UO channel top width B U3 area h U1 channel base width b U2 channel depth ht obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 1 1000 x b mh x v m 8 b d where q flow rate l sec B channel top width cm b channel bottom width cm d depth of channel cm h head cm v flow velocity cm sec RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equat
9. 99 123 99 123000 PL 505 107 The following is a list of commands for the secondarv parser Command Response 8 the content of af where a A D F P and U 0 through 9 e g P5 the content of P5 D parameters are the only parameters which may be altered through the secondary command parser which bypasses the security parameter FO This may be useful for example in periodically reading and then resetting the short total D2 The protocol for altering the value of a D parameter via the secondary parser is dn where n is parameter number is the value stored in the parameter e g d4 50 this sets the minimum flow rate to 50 for D4 0 totalizer value similar to that of the Flow and Total F2 displav except that the multiplier is not displaved t1 totalizer value returned as a floating point number with a maximum of 6 decimal places modified to include the effect of the totalizer multiplier e g if the OCM 3 display shows 00005678 x 100 the response would be 567800 000000 t2 returns the current 24 hour time hh mm ss 8 returns the current date dd mm vv f returns the current flow rate this is similar to the OCM 3 parameter F2 display however it is not subject to truncation to less than 6 decimal places PL 505 108 ji returns a code indicating the relav status code relav 1 2 3 0 0 0 0 1 1 0 0 2 0 1 0 3 1 1 0 4
10. Amores No 1155 Col Del Valle 03100 Mexico D F Mexico Tel 575 31 44 575 83 13 575 27 78 Fax 575 26 86 Internet http www milltronics com TABLE OF CONTENTS TITLE ABOUT THIS About This Manual About the OCM 3 SPECIFICATIONS Programmer Transducer Temperature Sensor Cabling Communication Software INSTALLATION PL 505 Installing the OCM 3 Outline and Mounting OCM 3 Layout System Diagram Installing the Transducer Installing the Temperature Sensor mA Output Relays Synchronization Power Connections Installing the Memory Back up Battery Communicating Via Computer Installing the Programmer PAGE 10 11 11 11 11 13 13 14 15 16 16 17 17 18 19 20 20 20 START UP General Kevpad Legend Initial Start Up Fundamental Checks OPERATION PL 505 Memorv Securitv Units Flow Calculation Displav Damping Relavs mA Output Fail Safe Flow rate and Totalizing Logging Blanking Temperature Time and Date Emulation Mode Reset Flow Velocitv Input Auxiliary Head Input DC Output Diagnostic Aids 21 21 22 22 25 27 27 27 28 28 29 30 30 31 31 32 34 34 34 35 35 36 36 37 37 D PARAMETER LISTING 39 F PARAMETER LISTING 41 P PARAMETER LISTING 43 U PARAMETERS FOR P3 PRIMARY ELEMENT 51 Simple Exponential Devices P3 0 53 BS 3680 Rectangular Flume P3 1 58 BS 3680 Round Nose Horizontal Crest Weir P3 2 60 BS
11. P3 There is no user difference between absolute and ratiometric calculations P4 The flow curve is characterized by entering the head Aeven and area Aoda ordinates for the number of data points n 4 to 16 over the flow range The first point A0 A1 generally being at 0 head and the last point A2n 2 A2n 1 generally being at maximum head U parameters required U parameters calculated UO number of data points n 4 to 16 U1 area h Aeven head Aodd area obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter e g typical open channel transducer d The transducer must be above the maximum head by at least the blanking value P47 PL 505 96 UNIVERSAL AREA X VELOCITV 1 00 A odd 0 9 0 8 0 7 0 6 Area 0 5 0 4 0 3 0 2 0 1 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 00 Head A even U0 8 A0 0 head point 1 A1 0 0 area point 1 A2 0 05 head point 2 A3 0 03 area point 2 A4 0 1 head point 3 A5 0 06 area point 3 A6 0 15 head point 4 A7 0 09 area point 4 A8 0 25 head point 5 A9 0 18 area point 5 A10 0 45 head point 6 A11 0 35 area point 6 A8 0 70 head point 7 A9 0 59 area point 7 A8 1 00 head point 8 A9 0 89 area point 8 For best accuracy concentrate data points where changes in flow are the greatest PL 505 97 PL 50
12. Total display F2 with the decimal point set per P33 It can also be viewed under D1 as the raw flow calculation Data on the running minimum and maximum flows that have occurred since the last reset can be viewed in two ways gt F7 gives the running min max flows and their time and date of occurrence since the last reset F7 is reset by F8 but only after satisfying the security parameter FO D3 D4 give the respective running min max flow data only that have occurred since they were last reset D3 D4 are reset simultaneously by entering 0 into either D3 or D4 D3 and D4 will then adopt the current flow rate and track the running min max values from that point on The security parameter FO does not need to be satisfied in order to reset D3 D4 Flow data specific to a particular time and date can be viewed under the data log F14 see Logging Totalizing Totalizing of the calculated flow is ongoing It is normally viewed under the Flow and Total display F2 An auxiliary totalizer D2 is provided for operator usage and is intended for short term totalizing to a maximum count of 999999 It can be reset or preset independently of the F2 totalizer after satisfying the security parameter FO In order to adjust the rate of filling of the totalizer the totalizer multiplier P32 can be set to an appropriate value The totalizer can be reset via F11 Totalizing that is specific to the time and date can be viewed under the data log F1
13. U1 crest height p U4 Cp U2 crest length L obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 2 3 x g 5 x C x Cp x bxh where q flow rate C a function of h and L g gravitational acceleration b crest width Cp a correction factor as a function h head of h and p applied to C RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q Qcal X C Ccal xX Cp Cpcal xX h heai 5 where q flow rate Qcal flow rate at maximum head h head maximum head C discharge coefficient for head Ccal discharge coefficient for maximum head Cp correction factor for C Cpcal correction factor for Ccal Refer to Operation X Flow Calculation PL 505 66 BS 3680 FINITE CREST WEIR transducer 3 to 4 x hmax a lt 4 T The transducer must be above the maximum head by at least the blanking value P47 PL 505 67 BS 3680 THIN PLATE RECTANGULAR WEIR P3 2 6 U parameters required U parameters calculated U0 approach width B U3 Ce U1 crest width b U4 Kp U2 crest height p obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION 84 0 For flows that can be calculated by the
14. ae head x side front For rated flows under free flow conditions the head is measured at a point upstream referenced to the beginning of the converging section Refer to the following table Flume Size Point of Measurement pipe dia in inches mm inches 4 12 25 1 0 15 32 1 3 18 38 1 5 21 44 1 8 24 51 2 1 30 64 2 5 36 76 3 0 42 89 3 5 48 102 4 0 54 114 4 5 60 127 5 0 66 140 5 5 72 152 6 0 The transducer must be above the maximum head by at least the blanking value P47 PL 505 57 BS 3680 Rectangular Flume P3 1 U parameters required U parameters calculated U0 approach width B U4 Cv U1 throat width b U5 Cd U2 hump height p U6 A U3 throat length L obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 29 x g x Cv x Cs x Cd x Bxh where q flow rate Cv velocity coefficient b throat width Cs shape coefficient g gravitational acceleration Cd discharge coefficient h head RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q Ocal X Cd Cdeai x Cv Cvcal x h hoai where q flowrate cal flow rate at maximum head h head maximum head Cv velocity coefficient Cvca
15. analog milliamps 011 internal DC volts D12 velocitv volts D13 auxiliarv input volts D14 temperature sensor ohms D15 self test checksum D16 restarts D17 exceptions D18 valid echos per 100 securitv access required a applicable to flow calculations requiring velocitv sensor PL 505 39 PL 505 40 F PARAMETER LISTING Refer to Operation for details PL 505 FO FI F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15 enter security code emulation mode run mode keypad to mA output show time set time show date set date software identification number view min max data reset min max data self check change security code reset master totalizer force a cold start auto zero calibration examine data log task view daily totals view flow rates view min max data method first day last day specified day clear data log security access required 41 PL 505 42 P PARAMETER LISTING Refer to Operation for details PO P1 P2 P3 PL 505 language 0 english 1 french 2 italian 3 german 4 spanish dimensional units linear velocity 0 centimetres centimetres per second 1 inches inches per second 2 feet feet per second 3 metres metres per second temperature units 0 Celcius 1 Fahrenheit primary element 0 exponential device 1 BS 3680 Rectangular Flume 2 BS 3680 Round Nose Horizontal Crest W
16. both modems and the OCM 3 baud rates to 1200 set the remote modem to operate in the answer back mode Refer to modem s user manual Communication select serial programming link with OCM 3 from the utilities menu See Milltronics Utilities Software Disk The computer screen will display the letters v These would normally have gone to the OCM 3 to ask it to send its display but the modem will have returned it to the screen instead Establishing Communication type the following ATD and the telephone number of the remote modem then press ENTER The modem will dial the number you have entered When the local modem establishes contact with the remote modem the local modem sends a message to the screen typical CONNECT press the v and ENTER keys to turn on the OCM 3 s display to serial channel The OCM 3 is now on line and communication can be carried out The user may escape to the main menu of the Utilities software and select another program if so desired To close the communication return to the Terminal Emulation program PL 505 111 Ending Communication type W to break OCM 3 communication with the modem The computer screen will display a flashing message OCM 3 muted type not displayed on the screen and then press ENTER This will cause both modems to switch to the command mode The local modem sends a message to the screen typical OK
17. l l l n c com n o n c com n o n c com n o relays shown in de energized state contacts rated at 5 A at 250 V non inductive All relays are certified for use in equipment where the short circuit capacity of the circuits in which they are connected is limited by fuses having ratings not exceeding the rating of the relays PL 505 17 SVNCHRONIZATION Where two to a maximum of twelve transducers will be sharing a common conduit the OCM 3s should be synchronized In order to synchronize OCM 3s gt remove jumper J1 on board A on all but one OCM 3 ADE IN CANADA R8__D D1 interconnect the SYNC terminal TB1 20 of all OCM 3s Insure that all OCM 3s share a common ground TB1 34 s Y E NiS Las a lE a dek OCM 3 20 2 22 4 TB1 4 5 UT lis PL 505 18 POWER CONNECTIONS The OCM 3 power supply accepts 100 115 200 or 230 V ac per switch SW1 board B selection and 9 to 30 V dc The OCM 3 operates either under ac or dc power or both ac and dc live simultaneously If both ac and dc power are live the OCM 3 normally draws power from the ac supply In the event that the ac supply fails the OCM 3 then draws power from the dc supply AC POWER 200V jisv 230v INPUT OFF Yoo v T z P z z z 2 switch shown in Fari OFF pos
18. serial communication including RS 232 removable infra red programmer AC and DC bi current operation PL 505 8 SPECIFICATIONS Power Environmental Memorv back up Range Resolution Temperature Compensation Programming Inputs Outputs PL 505 gt de supply gt 9 to 30 V DC 8 W max and or ac supply gt 100 1 15 200 230 V ac 15 50 60 Hz 20 VA max location indoor outdoor altitude 2000 m max gt ambient temperature gt 20 to 50 C 5 to 122 F suitable for outdoor Type 4X Nema 4X IP65 enclosure relative humidity gt installation category II pollution degree gt 4 gt 3 V battery NEDA 5003LC or equivalent Operating life 1 year SuperCap capacitor for back up during battery replacement gt 0 3 m min to 1 2 m max 1 to 4 ft 0 6 m min to 3 m max 2 to 10 ft gt 0 2 mm 0 007 external sensor to compensate over the operating range via supplied programmer and communication link velocity sensor and 0to 10 Vdc gt 2 7 mV auxiliary head gt range resolution transducer drive 44 Khz 400 Vpp pulses of 0 1 msec typical duration at a 100 msec typical repetition rate instrumentation range 0 20 or 4 20 mA resolution 5 uA gt maximum loading 1 KQ isolation 300 V ac continuous Communication relays 3 alarm control relays gt 1 form C SPDT c
19. 0 0 5 1 0 6 0 1 7 1 1 IV start data log down load mmddvv data log down load start date immddvv data log down load end date N3 stop data log down load PL 505 109 Modem Communication Communication with the OCM 3 over an answer back telephone modem is relativelv straight forward For modem communication over conventional telephone lines a maximum of 1200 or 2400 baud is recommended Generally a lower baud rate is more reliable on noisv lines Modem should be self answering and data checking capabilitv turn on The Milltronics Utilities software can be run via modem In addition the Terminal Emulation program of the Utilities software package can be used to send control sequences directly to the modem The remote modem is defined as the modem connected to the OCM 3 The local modem is defined as the modem connected to the computer It should be noted that the modem responses listed in the following discussion serve only to typify what is presently common in current field of RS 232 communication standard modem cable local modem computer telephone lines remote modem modem TB 1 s 3 7 DB 25 connector PL 505 110 Considerations set the cold start F12 default baud to 1200 bv removing jumper J1 on board A set
20. 3 receive buffer is near empty the OCM 3 sends an XON signal to tell the sender that it is safe to resume sending The communication baud rate of the OCM 3 and its correspondent must be the same PL 505 102 Interconnection Bipolar Current BIPOLAR VO 5 RRH TT xX L X X D OCM 3 on 6 7 8 910 l l I I I I I l l l l Sai I et 8 LI l ET refer to CVCC y i i instruction ovce ljalsjajsielz manual for connection to T S R C computer R H E O A E C M N I E M S L i O M D vy N l E T RS 232 IBM PC Computer Connection RS 232 RS 232 TRC xxo XX O p OCM 3 siket OEM 11112113 11 12 13 TB 1 TB 1 2 5 3 327 TED IEEE computer serial port computer serial port DB 9 connector DB 25 connector handshaking jumpers mav be required when communicating with software other than Milltronics OCM 3 standard Utilities package PL 505 103 Timed Print Out The OCM 3 can be programmed to periodicallv print out OCM data P34 35 A tvpical print out will have the following format Time hh mm ss Date dd mm vv Site Number Head units Velocity units Temperature units Flow Rate units Flow Total units only for applications using velocity input When the output is directed to a serial printer a delay is inserted between
21. 3680 Trapezoidal Flume P3 3 62 BS 3680 U Flume P3 4 64 BS 3680 Finite Crest Weir P3 gt 5 66 BS 3680 Thin Plate Rectangular Weir P3 6 68 BS 3680 Thin Plate V Notch Weir P3 7 70 Rectangular Weir Contracted P3 8 72 Round Pipe P3 9 74 Palmer Bowlus Flume P3 10 76 H Flume P3 11 78 Universal Head vs Flow P3 12 80 Rectangular Area x Velocity P3 13 82 Trapezoidal Area x Velocity P3 14 84 Modified Trapezoidal Area x Velocity P3 15 86 U Channel Area x Velocity P3 16 88 Circular Area x Velocity P3 17 90 Gull Wing Area x Velocity P3 18 92 Egg Shaped Area x Velocity P3 19 94 Universal Area x Velocity P3 20 96 APPENDICES Maintenance 99 Error Codes 100 Communications 101 PL 505 5 PL 505 ABOUT THIS ABOUT THIS MANUAL Although the OCM 3 is very approachable due its dialogue capabilities and intuitive operation the user should be familiar with this manual This manual provides the user with the necessary information required to install start up and operate the OCM 3 As the OCM 3 prompts the user with specific messages in a step by step fashion during programming the Start Up section serves essentially to compliment the OCM 3 Start Up provides the user with instructions on the use of the programmer and an overview of the programming requirements The D F P and U parameters listed in the Parameters section provide a quick reference of the available p
22. 4 The OCM 3 can be programmed to operate a remote totalizer by assigning any of the relays P15 18 or 21 to act as a totalizer contact Under this function the maximum rate of contact closure is 2 sec with a closure duration of 200 msec Under low flow conditions a cut off head P45 can be entered to avoid totalizing flows occurring at or below the flow corresponding to the cut off head The totalizer count is set by the relay setpoint parameter P16 19 or 22 respectively Typically the totalizer should be set for 300 to 3000 counts per day at maximum flow PL 505 31 LOGGING The OCM 3 provides an extensive logging feature which can be viewed on the local displav or retrieved via the serial communication link The logging rate P39 can be fixed or variable The latter being useful in conserving logging space The condition for variable logging is determined when selecting the logging rate Variable logging rate conditions are catagorized as rate of change of flow percent of maximum flow or percent of maximum head Logging occurs at the normal slower rate while the condition is less than the setpoint P40 If the condition exceeds the log rapid setpoint the rapid rate of logging takes effect until the condition falls below the log normal setpoint P41 The associated setpoint units are change of maximum flowrate per minute of maximum flowrate and of maximum head respectively The setpoints represent the ab
23. 5 98 MAINTENANCE The OCM 3 requires very little maintenance due to its solid state circuitry However a program of periodic preventative maintenance should be initiated This should include regular inspection general cleaning overall svstem performance checks and standard good housekeeping practices A periodic inspection of the transducer is recommended at which time anv build up of material on the face should be removed The enclosure should be cleaned using a vacuum cleaner and a clean drv brush For battery replacement refer to Installation Installing the Memory Back up Battery PL 505 99 ERROR CODES Error Code Listing PL 505 10 11 12 13 14 15 16 20 21 number underflow number overflow divide error bad argument invalid parameter svstem is locked head exceeds BS 3680 spec must use ratiometric invalid angle size invalid selection value is view oniv characterizer in use feature not available need whole number invalid date invalid time can t zero auxiliarv device b must be greater than R r 100 COMMUNICATIONS The OCM 3 provides serial communication either through Milltronics proprietarv bipolar current loop or industrv standard RS 232 Communication can be used to provide a video or paper printout of OCM activity It can also be used to provide remote programming and retrieval of the data log from devices such as computers and PLCs When usi
24. 60 F13 auto zero calibration 0 completed PL 505 23 If data logging is desired the time and date must be set Seog F4 24 hr time e g 1141 11 41 a m seconds are always assumed to be 00 F4 24 hr time 1141 F4 24 hr time time is displayed in 11 41 00 enter new time hh mm ss Sg F5 ddmmyyyy date e g 12101492 October 12 1492 Soann0nnnag F5 ddmmyyyy date 12 10 1492 enter new date The start up procedure is now complete Enter F2 to place the OCM 3 in the normal operating mode Snow FLOW units RELAY 123 TOTAL units STATE 222 the OCM 3 now displays the flow rate and total Refer to Operation Display PL 505 24 FUNDAMENTAL CHECKS For accurate determination of flowrate accurate head measurement is essential Check the following and correct if necessary check D5 for correct temperature at transducer location check D9 for correct distance from transducer to head check DO for accurate head measurement PL 505 25 PL 505 26 OPERATION Upon power up the transducer is fired periodicallv as set bv P36 A long interval between measurements mav be desirable in order to conserve power when operating the OCM 3 from a DC source of limited capacitv The echo is processed to determine the head DO The flow rate D1 is calculated bv the OCM 3 as a mathematical function P3 and P4 of head or a function of head and veloc
25. 9 60 5 30 24 hr 1 min 31 24hr 5 min 32 24hr 15 min units change of maximum flow per minute of maximum flow of maximum head units change of maximum flow per minute of maximum flow of maximum head P42 head determination 0 by OCM 3 1 by auxiliary device P43 volts in for zero head P44 head at 5 volts in P45 low flow cut off head P46 range at zero head P47 blanking distance PL 505 50 U PARAMETERS FOR P3 PRIMARV ELEMENT The number of U parameters required varies according to the primarv element chosen P3 and the method of calculation P4 The OCM 3 prompts the user bv displaving the next required parameter insuring the programming is complete The following is a list of the specific primarv elements to which the OCM 3 can be applied Refer to the page covering vour particular application the rest mav be disregarded P3 primarv element 10 11 12 13 14 15 16 PL 505 exponential device e g proportional V notch Parshall etc BS 3680 Rectangular Flume ISO 4359 BS 3680 Round Nose Horizontal Crest Weir ISO 4374 BS 3680 Trapezoidal Flume ISO 4359 BS 3680 U throated Flume ISO 4359 BS 3680 Finite Crest Weir ISO 3846 BS 3680 Thin Plate Rectangular Weir ISO 1438 1 BS 3680 Thin Plate V Notch Weir ISO 1438 1 Rectangular Weir contracted Round Pipe Palmer Bowlus Flume H Flume Universal Head vs Flow Rectangular Area x Velocit
26. CM 3 involves setting the units of measure gt P1 linear and velocity P2 temperature P5 flow rate and volume If the units are changed during the course of operation the change will be effected through all associated parameters and displays and will rescale flow and total data stored in the logs PL 505 27 FLOW CALCULATION Absolute vs ratiometric The OCM 3 can be programmed to use either of two methods P4 for calculating flow from the head measurement absolute or ratiometric The result is the same regardless of the method used The principal difference is the information that must be entered in order for the OCM 3 to carrv out the calculation The user s choice of method may ultimately be based upon the information which is at hand Refer to U parameters for the primarv element selected for a listing of the information required For the ratiometric method it is usually sufficient that the user know the flow rate Qai which occurs at maximum head heal On the other hand absolute calculations require that the user enter information such as the phvsical dimensions of the primarv element and the constant relating to units of measure for both linear dimensions and flow rates e g the general formula for flow through a single exponent primarv element is Q KH the specific formula for flow through a 45 V notch weir is cfs 1 03H thus Q flow in cubic feet per second K constant of 1 03 H head in feet
27. E The temperature as currently registered by the temperature sensor is viewed under D5 Data on the running minimum and maximum temperatures that have occurred since the last reset can be viewed in several ways F7 gives the running min max temperatures and their time and date of occurrence since the last reset F7 is reset by F8 but only after satisfying the security parameter FO D6 D7 give the respective running min max temperature data only that have occurred since they were last reset D6 is reset by entering a value lower than D5 and D7 is reset by entering a value larger than D5 D6 and D7 will then adopt the current temperature value and track the min max values from that point on The security parameter FO does not need to be satisfied in order to reset D6 or D7 Temperature data specific to the time and date can be viewed under the data log F14 see Logging D14 indicates the resistance of the temperature sensor corresponding to the temperature shown in D5 TIME AND DATE If the data logging features of the OCM 3 are to be used the time F4 and date F5 must be set The day starts at 00 00 00 and ends at 23 59 59 Adjusting the Time If the clock time is advanced beyond the next anticipated logging time the entry for each missed logging time is filled with a code which indicates that the system was not able to make entries at those times The daily total will be reduced proportional to the amount of time the day wa
28. F7 this is done by parameter F8 PL 505 35 FLOW VELOCITV INPUT In some applications the flow calculation for the chosen primarv element requires a velocitv input In this tvpe of application the transducer measurement is used to calculate the cross sectional area of the flow Bv multiplving the area with the distance per time units of velocitv the volume per time units of flow are calculated The calculated velocitv can be viewed via D8 The 0 and 100 limits of the velocity input must be scaled using parameters P8 and P9 select P8 enter the voltage corresponding to zero velocity gt select P9 enter the velocity corresponding to 5 V e g If the velocity sensor output is 1 V per m sec and the output is scaled for 7 V at 100 velocity 7 m sec then enter 5 m sec If the output is scaled for 4 V at 100 velocity 4 m sec enter 5 m sec P8 and P9 can only be accessed if P3 has been set for an option that requires the use of a velocity input The input voltage level can be viewed via D12 Voltage Input Current Input 10V UT 0 10V T P Sf F H 6 1 2 HIV 6 A 2 H L O U 4 H LIE o ufNl4 T M X l T DIL M X 7 18 19 2 5s lt Tey lt atamda S Ni tvpical 1 5 V signal from typical 4 20 mA signal from velocity sensor velocity sensor Add terminating resistor e g 250 Q for 1 5 V over 4 20 mA Signal must be positive with respect
29. OCM III Instruction Manual November 1996 ANN Technology based Customer driven ET bank you for purchasing Millironics products We endeavour to design equipment that is simple fo use and reliable in its operation with the aim of satisfying our customers needs Millironics has been designing and manufacturing process equipment since 1954 Our fields of expertise include ultrasonic level measurement in line weighing of dry bulk solids and motion sensing Milltronics is established world wide through associate offices and representatives Our network is continually being refined to provide our customers with first rate sales information engineering assistance and affer sales support For more details on our products and service please contact us and we will provide you with a listing of the offices or representatives nearest you ANN Eg Technology based Customer driven Canada 1954 Technology Dr P O Box 4225 Peterborough Ontario Canada K9J 7B1 Tel 705 745 2431 Fax 705 741 0466 U S A 709 Stadium Drive Arlington Texas U S A 76011 Tel 817 277 3543 Fax 817 277 3894 England Oak House Bromyard Road Worcester England WR2 5XZ Tel 01905 748404 Fax 01905 748430 France Parc de la Sainte Victoire B t 5 13590 Meyreuil France Tel 33 4 42 65 69 00 Fax 33 4 42 58 63 95 Belgium August van de Wielelei 97 2100 Deurne Antwerp Belgium Tel 03 326 45 54 Fax 03 326 05 25 Mexico
30. R To program the OCM 3 via the Programmer it must be placed into the front cover recess of the OCM 3 The back of the Programmer has a magnetic plate which will hold the programmer in place It can be removed when programming is completed PL 505 20 START UP GENERAL For the initial start up it is advisable to use the programmer for programming the OCM 3 The programmer transmits a coded infrared signal each time a kev is pressed The OCM 3 is designed to automatically scroll through the A D F P and U parameters in a structured sequence The scrolling is interactive in that depending on the option chosen for a given parameter subsequent parameters may be skipped or modified The user is thus prompted to satisfy only the parameters which are available to him for the application he has chosen KEYPAD HOOD HOOD sr OO HAL parameters scrolls Forward through negative the parameters enters content of entry field numeric entries with decimal point access to A parameters initiates a printout while viewing Flow and Total scrolls through selected parameter options scrolls Backward through the parameters clears content of entry field PL 505 21 LEGEND Press the associated programmer kev gt gt Display shown on OCM 3 MILLTRONICS OCM III Copyright Milltronics 1992 Programme
31. ate with the OCM 3 using the less sophisticated communication capabilities provided by such high level languages as Basic Pascal or C The only restriction imposed by using a system that does not use XON XOFF is that the user must insure that he does not send long streams of commands to the OCM 3 without pausing periodically to allow the OCM 3 time to process them Most users who wish to write their own software to communicate with the OCM 3 will do so for a specific purpose An example would be to create a customized data log For this the user will want that only the numeric values be returned and none of the descriptive information To achieve this the OCM 3 provides a secondary command parser which is accessed when the OCM 3 receives a command enclosed by When the leading is detected by the primary parser the OCM 3 diverts the message to the secondary parser The secondary parser remains in control until it receives the trailing If the trailing is not received within a few seconds the secondary parser is aborted and control is reverted to the primary parser automatically The OCM 3 response message to a command to the secondary parser is a sequence of ASCII characters terminated by an ASCII carriage return hex OD and an ASCII line feed hex OA All system parameters and most other responses are floating point numbers with a maximum of 6 decimal places e g typical OCM 3 response display value message 0 0 000000
32. cm v flow velocity cm sec b channel base width cm Refer to Operation Flow Calculation PL 505 86 MODIFIED TRAPEZOIDAL AREA X VELOCITV transducer W ht k The transducer must be above the maximum head by at least the blanking value P47 PL 505 87 U CHANNEL AREA X VELOCITY P3 16 U parameters required U parameters calculated UO base diameter D U1 area h obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter PL 505 88 U CHANNEL AREA x VELOCITV transducer The transducer must be above the maximum head by at least the blanking value P47 PL 505 89 CIRCULAR AREA X VELOCITV P3 17 U parameters listed U parameters calculated UO conduit diameter ID U1 area h obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter PL 505 90 CIRCULAR AREA X VELOCITV transducer This dimension should be at least 15 cm 6 shorter than the blanking value P47 The transducer must be above the maximum head by at least the blanking value P47 PL 505 91 GULL WING AREA X VELOCITY P3 18 U parameters required U parameters calculated U0 channel base width b U4 area h U1 lower angle alpha o U2 upper angle beta f U3 transition height ht obtain from manufacturer s sp
33. d PL 505 15 INSTALLING THE TRANSDUCER TRANSDUCER ENT IPOL Max cable run 183 m 600 ft of RG 62U or equivalent Cable must be run in a grounded metal conduit with no other cabling except Temp Sensor cable Ground shield at OCM 3 oniv OCM 3 TB1 Insulate shield at junctions to prevent inadvertent grounding Basic Wiring Transducer AN Hazardous voltage present on transducer terminals during operation INSTALLING THE TEMPERATURE SENSOR TEMP In order to compensate for uniform l SENSOR 0 temperature change in the air I p B 5 W between the transducer and the flow L H Le l surface the temperature sensor KT DIL MX must be connected to the OCM 3 2fis 14 isii6liz islisl Maximum cable run 183 m 600 ft of Beldon 8760 1 pair shielded twisted 18 AWG or equivalent Temperature sensor cable can be run with the transducer cable in a grounded metal conduit fa Ground shield at OCM 3 only Basic Wiring Temperature Sensor PL 505 16 mA OUTPUT isolated 0 or 4 to 20 mA output P26 into 1 KQ load maximum Wiring should conform to standard instrumentation practices T E CURRENT l O P S H HJH TT 1 T D ke 3 4 5 67 8 9 hofy LT Ground shield at OCM 3 only RELAYS RL1 L2 RL3 l TB1 29 30 32 33 CMs p4 25 26127 T U 1 I U 70 1 T l
34. each line to allow the printer time to print each line before another is sent In that way the simplest of printers may be used without need of XON OFF or hardware handshaking only a three wire connection is required The printer must be at least 40 columns wide The OCM 3 sends text in upper and lower case The printer must support both upper and lower case or else treat lower case as if it had been sent in upper case The printing interval must divide evenly into the selected units of time for printing to occur at regular intervals e g P34 1 printer mode set for interval in minutes P35 gt 7 print interval set for 7 minutes Printing starts at 7 minutes after the hour and will occur everv 7 minutes thereafter until 56 minutes into the hour The next print out would not occur until 7 minutes into the next hour Since the port used for communication is the same as used for normal serial communication a software switch controls whether or not the displav is sent out on the serial port The switch is controlled bv tvping v to allow data transmission or w to stop it The Milltronics printer emulation program does this automaticallv If the OCM 3 is connected to a computer programmed for printer emulation the computer will receive the print out data and displav it on the video terminal refer to Milltronics Utilities Software PL 505 104 Milltronics Utilities Software Disk
35. ecifications calculated by OCM 3 May be viewed by accessing U parameter PL 505 92 GULL WING AREA X VELOCITV transducer The transducer must be above the maximum head by at least the blanking value P47 PL 505 93 EGG SHAPED AREA X VELOCITV P3 19 U parameters listed U parameters calculated UO top radius R U3 area h U1 bottom radius r U2 axial displacement d obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation gt 1 1000 xAxv where q flow rate in I sec v flow velocity in cm sec RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q cal X A Acal X V Vcal where q flow rate cal flow rate at Neal A cross sectional area of flow Acal cross sectional area of flow at hcal v flow velocity Refer to Operation Flow Calculation PL 505 94 EGG SHAPED AREA X VELOCITV 2 transducer standpipe V This dimension should be at least 15 cm 6 shorter than the blanking value P47 The transducer must be above the maximum head by at least the blanking value P47 PL 505 95 UNIVERSAL AREA X VELOCITY P3 20 Arbitrary area is typically used when the primary element and or its flow do not fit any of the primary elements covered by
36. eir 3 BS 3680 Trapezoidal Flume 4 BS 3680 U throated Flume 5 BS 3680 Finite Crest Weir 6 BS 3680 Thin Plate Rectangular Weir 7 BS 3680 Thin Plate V notch Weir 8 Rectangular Weir contracted 9 Round Pipe 10 Palmer Bowlus Flume 11 H Flume 12 Universal Head vs Flow 43 13 Rectangular Area x Velocitv 14 Trapezoidal Area x Velocitv 15 Modified Trapezoidal Area x Velocitv 16 U channel Area x Velocitv 17 Circular Area x Velocitv 18 Gull wing Area x Velocity 19 Egg shaped Area x Velocity 20 Universal Area x Velocity P4 method of calculation 0 absolute 1 ratiometric P5 flow rate units flowrate volume 0 litres per second litres 1 cubic feet per second cubic feet 2 imperial gallons per minute imperial gallons 3 U S gallons per minute U S gallons 4 imperial million gallons per day imperial million gallons 5 U S million gallons per day U S million gallons 6 cubic metres per hour cubic metres 7 cubic metres per day cubic metres P6 flow at maximum head P7 height of maximum head P8 volts in at zero velocity P9 velocity at 5 volts in P10 velocity at maximum flow PL 505 44 P13 displav damping 0 off 1 low 2 med 3 high P14 display lighting P15 P18 P21 PL 505 O on 1 auto off 2 off relay 1 2 3 assignment 0 not in service 1 de energize on loss of echo 2 energize on loss of echo 3 de energize on high fl
37. equation q Ce x23 20 x be x he where q flowrate Ce a function of h p b and B g gravitational acceleration be effective crest width b Kp b crest width he effective head h Kn h head Kn 1 Mmm RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q cal X Ce Cecal X h Neal 5 where q flow rate cal flow rate at maximum head h head maximum head Ce discharge coefficient for head CVcal discharge coefficient for maximum head Refer to Operation Flow Calculation PL 505 68 BS 3680 THIN PLATE RECTANGULAR WEIR transducer 4 to 5 x hmax The transducer must be above the maximum head by at least the blanking value P47 PL 505 69 BS 3680 THIN PLATE V NOTCH WEIR P3 7 U parameters required U parameters calculated U0 notch angle alpha U1 Ce obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q Ce x 8 15 x tan o 2 x 2g x h2 gt where q flow rate h head g gravitational acceleration Ce function of h and a 0 notch angle alpha 9 angle is restricted to 90 53 133 or 28 066 Otherwise use ratiometric calculation RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q cal X Ce Cecal X
38. er The transducer must be above the maximum head by at least the blanking value P47 PL 505 61 BS 3680 TRAPEZOIDAL FLUME P3 3 U parameters required U parameters calculated UO approach width B U5 Cv U1 throat width b U6 Cd U2 hump height p U7 Cs U3 throat length L U8 A U4 slope m obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 2 3 x 93 x Cv x Cs x Cd xb x h 5 where q flowrate Cv velocity coefficient g gravitational acceleration Cs shape coefficient b throat width Cd discharge coefficient h head RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q Ocal X CS Cscal x Cd Cdal x Cv CVveal x h hcai 7 where q flow rate Cscal shape coefficient for maximum head cal flow rate at maximum head Cv velocity coefficient h head CVcal velocity coefficient for maximum head maximum head Cd discharge coefficient for head Cs shape coefficient for head Cdcal discharge coefficient for maximum head Refer to Operation Flow Calculation PL 505 62 BS 3680 TRAPEZOIDAL FLUME end transducer plan 3 to 4X hmax Leal Ss The transducer must be above the maximum head by at least the blanking value P47 PL 505 63
39. inti ff tan o f N B N N a typical 1 5 V signal from typical 4 20 mA signal from auxiliary device auxiliary device Add terminating resistor e g 250 Q for 1 5 V over 4 20 mA Signal must be positive with respect to ground Auxiliary Input additional to Basic Wiring DC OUTPUT The OCM 3 provides a 24 V DC output that can be used to supply power to a remote customer device The output is not isolated from the DC rails that supply the OCM 3 electronics and no overload protection is provided As such the output must not operate beyond its specified capacity DIAGNOSTIC AIDS D15 through D18 are diagnostic aids to Milltronics service personnel when troubleshooting system problems D18 also serves as a performance indicator by displaying the number of valid echos received as a percentage of the number of pulses being fired by the transducer A low value indicates that a large proportion of the pulses fired are not producing valid echos In such instances the transducer should be checked for proper mounting and aiming or the transducer wiring checked for excessive noise If the value is zero shorted or opened transducer wiring may be suspect PL 505 37 PL 505 38 D PARAMETER LISTING Refer to Operation for details DO head D1 flow rate D2 short total D3 maximum flow rate D4 minimum flow rate D5 temperature D6 maximum temperature D7 minimum temperature D8 velocity 09 nominal target range D10
40. ion q cal X A Acal X V Vcal A b mh xh Acai b Mheal X Neal m B b d where q flow rate l sec B channel top width cm b channel bottom width cm d depth of channel cm h head cm v flow velocity cm sec Refer to Operation Flow Calculation PL 505 84 TRAPEZOIDAL AREA X VELOCITV transducer The transducer must be above the maximum head by at least the blanking value P47 PL 505 85 MODIFIED TRAPEZOIDAL AREA X VELOCITY P3 15 U parameters listed U parameters calculated UO channel top width B U3 area h U1 channel base width b U2 transition height ht obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation gt 1 1000 x b mh xv_ forhsd q 1 1000 x b md d B h d xv forh gt d m gt B b d where q flow rate l s d height of transition cm B channel top width cm h head cm b channel base width cm v flow velocity cm sec RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q Qcal X A Acal X V Vcal forh lt d A b mh xh Acal b mhcal X Neal for h gt d A b md xd B h d Acal b md x d B hcal d m B b d where q flow rate d depth of channel Qcal flow rate at hcal h head B channel top width
41. isplay F2 The damping selections are off low medium and high Relay functions associated with flow rate respond to the dampened reading values mA output damping P27 dampens the change in the mA output The parameter entry is in seconds for spanning the 0 to 100 of the mA range selected P26 Displays and relay functions associated with the mA output respond to its dampened value PL 505 29 RELAVS Three on board multipurpose relavs are provided bv the OCM 3 P15 18 and 21 set the respective functions for relavs 1 2 and 3 Depending on the function selected these parameters determine the need and configuration of the subsequent relav control parameters P16 17 relay 1 P19 20 relay 2 and P22 23 relay 3 If the relay is to function as a driver for a remote totalizer or as a flow sampler contact the setpoint will be factored by the totalizer multiplier P32 The status of each relay is shown in the display Refer to Flow and Total Display A Y For battery operation have relays energizing on alarm mA OUTPUT The OCM 3 provides a mA output TB1 4 5 which can be assigned P24 to represent the measurement of flow head velocity or temperature The associated scaling P25 is factory set to a value of 0 This provides normal scaling with respect to the assigned measurement Normal scaling for representation of flow head or velocity is 5 00r4mA 0 20 mA maximum measurement value for gt 86 flow
42. ition L2 N select appropriate gt L1 voltage OCM 3 Tei 26 34 35 36 100 115 200 230 V ac 50 60 Hz select voltage via switch on board B The equipment must be protected bv a 15 A fuse or circuit breaker in the building installation A circuit breaker or switch in the building installation marked as the disconnect switch shall be in close proximitv to the equipment and within easv reach of the operator DC POWER INPUT T JPOWER L L L 9 30V A Ke OCM 3 A 2324 34 negative dc input TB1 24 is 9 to 30 Volt tied to ground TB1 34 dc input dc terminals shall be supplied from SELV source in accordance with IEC 1010 1 Annex H PL 505 19 INSTALLING THE MEMORY BACK UP BATTERY N Disconnect power before installing or replacing the batterv Do not install the memory back up battery until the OCM 3 is to be used The unit is supplied with one battery package Remove the battery from the package and insert it into the battery socket Refer to Operation Memory The memory battery B1 see Specifications should be replaced yearly to insure memory back up during lengthy power outages An on board capacitor provides one hour of memory retention in order to preserve the memory while the battery is being changed COMMUNICATING VIA COMPUTER Refer to Communication INSTALLING THE PROGRAMME
43. ity P42 The flow rate is then integrated to yield the totalized flow D2 The Flow and Total fields which are displayed during the normal running mode F2 are also continuously updated Viewing or changing the content of a parameter except F1 emulation is done without disturbing the acquisition processing or logging of flow data see Security restricted usage of display lighting P14 relays P15 18 amp 21 mA output and communications will also conserve power MEMORY During a power interruption the memory back up will hold the programming the log and the totalizer values and run the clock The memory battery B1 provides up to one year of memory retention see Appendices Maintenance SECURITY The content of all A D F P and U parameters can be viewed without having to satisfy the security parameter FO However if it is desired to change the content of any of these parameters the security parameter must be satisfied except for resetting the running min max displays parameters D3 D4 and D6 D7 Once security has been satisfied access continues for 5 minutes after the last key is pressed or until F2 is re entered The security code may be changed from its factory set value 2 71828 by entering a new value into F10 It is imperative that the new value be recorded as the code can not be viewed If the code is lost consult Milltronics UNITS Programming of the O
44. l velocity coefficient for maximum head Cd discharge coefficient for head Cdcal discharge coefficient for maximum head Refer to Operation Flow Calculation PL 505 58 BS 3680 RECTANGULAR FLUME 3 to 4 x hmax L The transducer must be above the maximum head by at least the blanking value P47 PL 505 59 BS 3680 Round Nose Horizontal Crest Weir P3 2 U parameters required U parameters calculated UO crest width b U3 Cv U1 crest height p U4 Cd U2 crest length L U5 A obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 2 3 gt x g x Cv x Cs x Cd x b x h5 where q flowrate Cv velocity coefficient g gravitational acceleration Cs shape coefficient b throat width Cd discharge coefficient head RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q Ocal X Cd Cdeai x Cv Cvcal X h heal i where q flow rate cal flow rate at maximum head h head maximum head Cv velocity coefficient CVcal velocity coefficient for maximum head Cd discharge coefficient for head Cdcal discharge coefficient for maximum head Refer to Operation Flow Calculation PL 505 60 BS 3680 ROUND NOSE HORIZONTAL CREST WEIR transduc
45. le Belden 9925 3 wire shielded 24 AWG or equivalent maximum separation 15 m 50 ft Belden 9552 2 pair shielded twisted 18 AWG or equivalent maximum separation 1 500 m 5 000 ft Milltronics Utilities Software on standard PC floppy disk for DOS 3 1 and up PL 505 11 PL 505 12 INSTALLATION Installation shall only be performed by qualified personnel and in accordance with local governing regulations INSTALLING THE OCM 3 The OCM 3 should be mounted in a clean drv area that is within the ambient temperature range and suitable for the specified enclosure The front cover should be accessible for programming and viewing It is advisable to keep the OCM 3 away from high voltage or current runs contactors and SCR control drives Do not mount the OCM 3 in direct sunlight without the use of a sun shield This product is susceptible to electrostatic shock Follow proper grounding procedures OUTLINE AND MOUNTING 209 mm La 8 2 gt 106 mm e 16mm lid 42 gt 0 6 id screws pry 6 places h 91mm _ i 3 6 Os le 255 ERA ABEI SE MILEERONIES OCM M 12 11 2 programmer 9 267 mm 10 5 oe RSJ ia suitable location for mounting holes conduit entrances accessed under enclosure lid 4 3 mm 0 17 Milltronics recommends usi
46. nder free flow conditions The transducer must be above the maximum head by at least the blanking value P47 PL 505 77 H FLUME P3 11 U parameters required UO maximum listed head hmax as developed by the U S Department of Agriculture Soil Conservation Service obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION 84 1 For flows that can be calculated by the equation q cal X f h hmax f hcal hmax where q flow rate cal flow rate at maximum head f h hmax and f hcal hmax are determined by polynomial synthesis Refer to Operation Flow Calculation PL 505 78 H FLUME transducer Mil point of measurement A plan front side For rated flows under free flow conditions the head is measured at a point downstream from the flume entrance Refer to the following table Flume Size Point of Measurement D feet cm inches 0 5 4 7 1 88 0 75 6 7 2 69 1 0 9 1 3 63 1 5 13 5 5 38 2 0 17 9 7 19 2 5 22 5 9 00 3 0 27 2 10 88 45 40 5 16 19 The transducer must be above the maximum head by at least the blanking value P47 PL 505 79 UNIVERSAL HEAD vs FLOW P3 12 The flow curve is characterized by entering the head Aeven and flow Aoda ordinates for the number of data points n 4 to 16 over the flow range The first point A0 A1 generally being at 0 head and the last p
47. ng a punch dia 4 places for making holes in enclosure customer mounting screw Non metallic enclosure does not provide grounding between connections Use grounding tvpe bushings and jumpers PL 505 13 OCM 3 LAVOUT MILURONICS_OCMII BOARDA MADEINCANADA PETERBOROUGH ONTARIO R9 RIO any FI pyg board A we ES ovx piv wer LT c display wvm board mo 5 En lm ra 013 g r 7 ua esi f u28 2 25 Lal 3 exh g L ok raw nsv OFF 100V 22 23 2418225 26 27 28 29 30 31 32 33 34 35 36 RIT RLZ RLS si S IS ISIS ISJISISISJS S 9SIS
48. ng the bipolar current loop communication runs of up to 1 500 m can be achieved as opposed to the limited runs of 15 m using RS 232 Bv terminating the bipolar current loop with a Milltronics CVCC the communication format is then converted to RS 232 OCM 3 site number 989 RS 232 bipolar current loop isa so bi 6166 2 1 customer s computer customer s computer serial printer ii Y optional parallel printer Milltronics OCM 3 Utilities Software available provides conversion to RS 232 or 422 PL 505 101 Milltronics provides a standard Utilities software package for convenient communication between an IBM PC compatible computer and the OCM 3 In addition the user may opt to develop his own custom software program to perform tasks suited to his specific needs Protocol The protocol for the OCM 3 is as follows baud rate set via P37 parity none stop bits 1 word length 8 The OCM 3 uses a three wire XON XOFF serial communication link When the OCM 3 s receive buffer is near full the OCM 3 sends an XOFF signal to tell the sender of the near full condition If the sender is also using XON XOFF it will respond to the XOFF signal by suspending its transmission Similarly when the OCM
49. oint Azn 2 A2n 1 generally being at maximum head U parameters required UO number of data points n 4 to 16 Aeven head Aoda flow rate obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q cal X f h f hcal where f h and f hcal are polynomials based on interpolation of data points Refer to Operation Flow Calculation PL 505 80 UNIVERSAL HEAD vs FLOW e g tvpical compound weir Parameters UO 11 AO 0 head point 1 A12 1 05 head point 7 A1 0 flow point 1 A13 2 65 flow point 7 A2 gt 0 3 head point 2 A14 1 2 head point 8 A3 0 1 flow point 2 A15 3 4 flow point 8 A4 gt 0 6 head point 3 A16 1 4 head point 9 A5 0 7 flow point 3 A17 gt 5 0 flow point 9 A6 0 8 head point 4 A18 1 7 head point 10 A7 1 5 flow point 4 A19 8 0 flow point 10 A8 0 95 head point 5 A20 2 head point 11 A9 2 25 flow point 5 A21 11 8 flow point 11 A10 1 head point 6 A11 2 5 flow point 6 12 A odd 10 2 LL 0 2 04 06 08 1 12 14 1618 2 Head A even For best accuracv concentrate data points where changes in flow rate are the greatest PL 505 81 RECTANGULAR AREA X VELOCITY P3 13 U parameters required U parameters calculated UO channel width B U1 area h
50. ontact per relay rated at 5 A at 250 V ac non inductive or 30 V dc gt dc output 24 V de 20 mA average to 200 mA at 1 10 duty cycle max RS 232 or 20 mA bipolar current loop 300 600 1200 2400 4800 9600 or 19200 baud Data Logs variable rate on 1 5 15 30 or 60 min or 24 hr 31 days minimum 2 years maximum Display illuminated liquid crystal 5 x 7 dot matrix display with 2 lines of 40 characters each Enclosure Type 4X NEMA 4X IP65 209 mm W x 285 mm H x 92 mm D 8 2 W x 11 2 H x 3 6 D polycarbonate Weight 2 3 Kg 5 1 Ib Approvals gt CE FM CSA NRTL C EMC performance available upon request PROGRAMMER Enclosure general purpose 67 mm W x 100 mm H x 25 mm D 2 6 W x 4 H x 1 D ABS plastic Operating Temperature 20 to 50 C 5 to 122 F Battery 9 V ANSI NEDA 1604 PP3 or equivalent PL 505 10 TRANSDUCER Model w ST 25 Refer to associated Transducer manual TEMPERATURE SENSOR Model gt TS 2 LTS 1 or LTS 1C Refer to associated Temperature Sensor manual CABLING optional Transducer Temperature Sensor Communication RS 232 Bipolar Current COMMUNICATION SOFTWARE RG 62U coaxial maximum separation 183 m 600 ft must be run in grounded metal conduit Belden 8760 1 pair shielded twisted 18 AWG or equivalent maximum separation 183 m 600 ft can be run in conduit with transducer cab
51. ow rate 4 energize on high flow rate 5 de energize on low flow rate 6 energize on low flow rate 7 de energize on high head 8 energize on high head 9 de energize on low head 10 energize on low head 11 de energize on high velocity 12 energize on high velocity 13 de energize on low velocity 14 energize on low velocity 15 de energize on high analog 16 energize on high analog 17 de energize on low analog 18 energize on low analog 19 de energize on low D11 volts 20 energize on low D11 volts 21 de energize on high D11 volts 22 energize on high D11 volts 23 de energize on low Aux volts 45 P16 P19 P22 P17 P20 P23 24 energize on low Aux volts 25 de energize on high Aux volts 26 energize on high Aux volts 27 de energize up control on head 28 energize up control on head 29 de energize down control on head 30 energize down control on head 31 de energize up control on analog 32 energize up control on analog 33 de energize down control on analog 34 energize down control on analog 35 pulse flow totalizer 36 pulse sampler by volume 37 pulse sampler by time 38 pulse by time of day relay 1 2 3 high setpoint relay 1 2 3 low setpoint P24 mA assignment 0 flow rate 1 head 2 velocity 3 temperature P25 If custom mA 20 mA P26 mA span PL 505 0 normal B custom 0 4 20 mA 1 0 20 mA
52. r key i INITIAL START UP After installation procedures have been completed the OCM 3 may be powered up Upon initial powering up the unit momentarily displays MILLTRONICS OCM III Copyright Milltronics 1992 and then scrolls through the available languages 0 language English il 1 LANGAGE K FRANCAIS il 2 LINGUA ITALIANO il 3 LANDESSPRACHE DEUTSCH il 4 IDIOMA ESPANOL The OCM 3 is asking which language you prefer to communicate in 0 language English language English selected Ga advance to FO FO lt enter securitv code PL 505 22 SBe9mmooaa ia 2 71828 must be entered PO language 0 English if the wrong language was selected it mav be changed here G P1 dimensional units 0 centimeters P2 temperature units 0 Celsius continue programming bv entering the desired options La ADVANCE and advancing until the lt ra scroll returns to PO It is then assumed that the PA7 blanking distance user has entered all the 61 01694 lt centimeters required parameters PO 0 language English For optimum calibration accuracv an F13 should be performed prior to accessing F2 the normal operating mode F13 auto zero calibration enter the current head The OCM 3 calculates P46 and automaticallv enters the value e9 160 Sooo F13 auto zero calibration 1
53. rate at maximum head P7 maximum head P10 velocity at maximum head Normal scaling for representation of temperature is Oor4mA gt 40 TC gt 20 mA 60 C If custom scaling is required the 20 mA corresponding value other than 0 can be entered into P25 The range 0 to 20 or 4 to 20 mA and damping see Damping are set via P26 and P27 respectively The mA function can be overridden for test purposes by setting the desired mA value into F3 When the value is entered the mA output will go to that value When F3 is exited the mA output will revert to normal operation Also see Emulation Mode In the case of absolute calculations P4 0 P6 is calculated by the OCM 3 PL 505 30 FAIL SAFE In the event of an echo loss the fail safe timer will begin counting If the echo loss duration surpasses that of the time set P29 a No Echo alert will be displayed in the Status field see Display The mA output will respond P30 by either holding the last value or immediately going to a predetermined value P31 The head and derived flow will hold their last value and totalization and logging will continue based on that value Upon resumption of a valid echo the mA output will return to a value corresponding to the present value of the measurement assigned at the mA damping rate P27 FLOW RATE AND TOTALIZING Flow rate Calculation of the flow rate is ongoing It is normally viewed under the Flow and
54. rence ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q K n x f h x s where q flow rate h head K constant f h A x 8959 A cross sectional area R hydraulic radius s slope of hydraulic gradient n roughness coefficient RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q Qcal X f h f Neal where q flowrate h head cal flow rate at maximum head maximum head Refer to Operation Flow Calculation PL 505 74 ROUND PIPE transducer This dimension should be at least 15 cm 6 shorter than the blanking value P47 The transducer must be above the maximum head by at least the blanking value P47 PL 505 75 PALMER BOWLUS FLUME P3 10 U parameters required UO maximum listed head hmax typically those manufactured by Warminster or Plasti Fab obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q cal X f h hmax f hca hmax where q flow rate cal flow rate at maximum head h head maximum head f h hmax is determined by polynomial synthesis Refer to Operation Flow Calculation PL 505 76 PALMER BOWLUS FLUME D 2 point of measurement transducer y o 0 head D pipe or sewer diameter for rated flows u
55. rm the flow calculation The flow rate is totalized and stored in a comprehensive data log to provide detailed flow analvsis Programming of the OCM 3 allows the operator to select the flow calculation specific to the primarv measuring device flume weir or pipe Special emphasis has been placed on providing the most accurate flow calculations possible To this end specific routines have been written to complv with the British Standards Institute s Specifications BS 3680 These routines calculate correction factors taking into account second order effects such as approach velocitv and boundarv laver In the event that flow measurement is not covered bv one of the flow calculations provided the OCM 3 can be programmed for flow measurement using one of the universal flow calculations The OCM 3 provides serial communication for remote programming data log retrieval and print out for devices such as computers PLCs and printers Milltronics provides a standard utilities software package for OCM 3 programming remote displav and data retrieval However the user is not limited to the software provided The user can develop his own software program to perform tasks suited to his specific needs The OCM 3 features multi field illuminated LCD for Flow and Total and Relay Status display 0 or 4 to 20 mA output vy three multipurpose relays including remote totalization 1 to 24 months data log subject to logging rate v extensive
56. rogramming and display parameters and their options The U parameter listing also provides mathematical and graphical details as a reference to assist the user in programming the OCM 3 to the primary element being used The user is urged to rely on the manufacturer s specification for obtaining and identifying the primary element to which the OCM 3 is being applied In short If you want to know about Read the product About This Specifications getting started Installation Start Up how it works Operation Parameters Appendices ABOUT THE OCM 3 The OCM 3 is to be used only in the manner outlined in this instruction manual The Milltronics OCM 3 Open Channel Monitor is an electronic instrument designed to measure flow in open channels It is housed in a polycarbonate enclosure and comes with a removable programmer As a system it is used in conjunction with a remote ultrasonic transducer or auxiliary head measurement device and a temperature sensor The OCM 3 transmits a pulse signal to the transducer which is then emitted as ultrasonic pulses The pulses echo off the water surface and are then sensed by the transducer The time for a pulse to echo back from the water surface is temperature compensated and converted into a measurement of head PL 505 7 The OCM 3 converts the head measurement into flow rate but also provides a velocitv sensor input for applications where a flow velocitv measurement is required to perfo
57. s shortened If the clock time is set back beyond the preceding logging time the previously logged date will be written over with new data as the logging proceeds PL 505 34 The dailv total will be increased proportional to the amount of time the dav was lengthened Adjusting the Date If the calendar is reset the OCM 3 will adjust the log dates accordingly taking into account leap years and days per month EMULATION MODE The flow calculation P3 P4 can be checked for accuracy by using the emulation parameter F1 The head is entered and the corresponding flow is displayed This function is useful when troubleshooting discrepancies between the OCM 3 calculation and the expected flow Relays assigned to functions associated with the emulation parameter respond to the emulated flows The mA output does not track the emulated flows when P28 mA output emulation 0 However if it is required to do so then the emulator parameter should be set to 1 RESET The following resets can only be executed after satisfying the security access FO Cold Start If it is desired to reset all parameters logs and totalizers to their factory setting this is done by forcing a cold start F12 Master Totalizer If it is desired to reset the master totalizer F2 this is done by parameter F11 Data Log If it is desired to reset the data log F14 this is done by parameter F15 Min Max Log If it is desired to reset the min max log
58. solute value of the rate of change that is for either increasing or decreasing flowrate The OCM 3 does not recognize negative entries into P 40 and P 41 Flow data is logged in 1 2 increments from 0 to 110 of maximum flow Flows above 110 are logged as 110 Truncation of flows to 110 does not apply to daily totalization Log Capacity vs Rates rate capacity 1 min 31 davs 5 3 months 15 9 months 30 1 vear 60 1 5 vears 24 hr 2 vears eg 15 5 9 months max 3 months min Once the log is filled the old data will be successivelv written over with the new data being logged The log can be examined via F14 Viewing of the log is done bv task and bv method The viewing tasks are dailv flow totals flow rates and min max flow data for flow or temperature The viewing methods are by first entry by last entry and by specified date The scrolling keys are used to maneuver through the tasks methods and time of day PL 505 32 Viewing the data log return to parameter base displav Task View Ess Temas Totals eee lt Ga lay E pee WEES Task View Flow Rates lt AE Task View Min Max Data select return to Method select Task display Task Oooo Monos Domma Method begin with first entry lt H IT P Task ooo Geooe Method begin with last entry Task Oooo Goose Donna Method _begin with specified date enter ddmmyyyy da
59. te view return to selected select Method entry display Daily Totals Flow Rates Min Max Data display OR display OR displays Day s total units Av9 d Flow Rate units Time and Date hh mm dd mm vvvj LTime and Date hh mm dd mm vvw Maximum Flow units Time and Date hh mm dd mm wvvj Minimum Flow Time and Date hh mm units dd mm yyyy units dd mm yyyy Maximum Temp Time and Date hh mm Minimum Temp units Time and Date hh mm__dd mm yyyy The day totalizer F14 does not use the master totalizer multiplier P32 It is possible that the daily total overflows In such a case the display will show PL 505 33 BLANKING Blanking is used to ignore the zone in front of the transducer where ringing or other false echo is at a level that interferes with the processing of the true echo The minimum blanking is factorv set but can be overridden bv entering the desired distance into P47 Ringing is the inherent nature of the transducer mass to continue vibrating after the transducer has been fired Ringing decavs to acceptable levels in the order of milliseconds Excessive cold or over tightening of the transducer mounting mav increase the ring time such that it appears as an echo during the receive cvcle This is usuallv indicated bv an incorrect high head reading Excessive ring time mav be overcome by increasing the blanking TEMPERATUR
60. to ground Velocity Input additional to Basic Wiring AUXILIARY HEAD INPUT In some applications the transducer input TB1 1 2 is not used to provide a signal for head measurement A typical example of this is an application which is beyond the 3 m 10 ft range of the OCM 3 In such a case the head could be derived from another Milltronics level monitor or other compatible device The method of head determination is set by P42 The OCM 3 simply substitutes the signal from the auxiliary device for the ultrasonic measurement provided by the transducer The programming and consequent flow calculation are performed as normal PL 505 36 The 0 and 100 limits of the auxiliary input must be scaled using parameters P43 and P44 select P43 enter the voltage corresponding to zero head select P44 enter the head corresponding to 5 V e g if the head output is 1 V per m and the output is scaled for 7 V at 100 head 7 m then enter 5 m If the output is scaled for 4 V at 100 head 4 m enter 5 m P43 and P44 can only be accessed if P42 has been set for head determination by an auxiliary device The input voltage level can be viewed via D13 Voltage Input Current Input 0 10V OUT 0 10V OUT S 5 75 P HIV C ATTY 2 HIV C AVY 2 H LTE oO U 4 H LJE oO U 4 0 O M XIC M T DIL M X vi 3 17 18 19 20 21 22L LN Ts N l air 60
61. type ATH and press the ENTER key Both modems will hang up The local modem sends a message to the screen typical OK if the W is not sent the OCM 3 and its modem will still be in communication This may result in the OCM 3 modem being unable to answer calls successfully depending on the type of modem OCM 3 software 3 26 or later averts this problem by automatically breaking communication between the OCM 3 and its modem after 15 minutes PL 505 112
62. v Trapezoidal Area x Velocitv Modified Trapezoidal Area x Velocitv U channel Area x Velocitv 51 17 18 19 20 Circular Area x Velocity Gull Wing Area x Velocity Egg shaped Area x Velocity Universal Area x Velocity The primary element must be installed in accordance with the manufacturers recommendations and in accordance with all governing regulations PL 505 52 SIMPLE EXPONENTIAL DEVICES P3 0 U parameters required UO exponent U1 k factor P4 0 only Typical Exponential Devices Sutro proportional weir head measurement only Rectangular Suppressed or Trapezoidal Cipolletti weir Kahfagi venturi Parshall flume Leopold Lagco Triangular V notch weir obtain from manufacturer s specifications Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q k h where q flowrate x exponent 00 k constant factor U1 h head RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q cal h hcal where q flowrate Qcal flowrate at maximum head h head Neal maximum head x exponent 00 Refer to manufacturers specifications for the exponent value Refer to Operation Flow Calculation PL 505 53 SIMPLE EXPONENTIAL DEVICES P3 0 TYPICAL SHARP CRESTED WEIRS a NO i Typical Weir Profiles V notch or Triangular Rectangular suppressed U0 2 5 U0 1 5
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