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Siemens OCM III Instruction Manual Download Page 53

SIMPLE EXPONENTIAL DEVICES,  P3 = 0

TYPICAL SHARP-CRESTED WEIRS

Typical Weir Profiles

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). 

transducer *

Rectangular - suppressed

U 0 = 1.5

V - notch or Triangular

U 0 = 2.5

Sutro (Proportional)

U 0 = 1

(symmetrical or asymmetrical)

Trapezoidal (Cipolletti)

U 0 = 1.5

* The transducer must be above the maximum head by at least the 
   blanking value, P47.

minimum

3 x h 

max

7ML19985AB01

OCM III

54

Summary of Contents for OCM III

Page 1: ...Instruction Manual November 2005 OCM III open channel ...

Page 2: ...urage users to purchase authorized bound manuals or to view electronic versions as designed and authored by Siemens Milltronics Process Instruments Inc Siemens Milltronics Process Instruments Inc will not be responsible for the contents of partial or whole reproductions of either bound or electronic versions While we have verified the contents of this manual for agreement with the instrumentation ...

Page 3: ...cation Software 11 INSTALLATION Installing the OCM 3 13 Outline and Mounting 13 OCM 3 Layout 14 System Diagram 15 Installing the Transducer 16 Installing the Temperature Sensor 16 mA Output 17 Relays 17 Synchronization 18 Power Connections 19 Installing the Memory Back up Battery 20 Communicating Via Computer 20 Installing the Programmer 20 7ML19985AB01 OCM III 3 ...

Page 4: ...urity 27 Units 27 Flow Calculation 28 Display 28 Damping 29 Relays 30 mA Output 30 Fail Safe 31 Flow rate and Totalizing 31 Logging 32 Blanking 34 Temperature 34 Time and Date 34 Emulation Mode 35 Reset 35 Flow Velocity Input 36 Auxiliary Head Input 36 DC Output 37 Diagnostic Aids 37 7ML19985AB01 OCM III 4 ...

Page 5: ...3 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...

Page 6: ...7ML19985AB01 OCM III 6 ...

Page 7: ...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 t...

Page 8: ...oundary layer In the event that flow measurement is not covered by 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 packag...

Page 9: ...apacitor for back up during battery replacement Range 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 Resolution 0 2 mm 0 007 Accuracy 1 mm m calculated error less than 0 02 Temperature Compensation external sensor to compensate over the operating range Programming via supplied programmer and communication link Inputs velocity sensor and auxiliary head range 0 to 10 V dc resolutio...

Page 10: ...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 lb Approvals CE FM CSA NRTL C MCERTS Class 1 open channel flow device with environment operation limits at 35 C 95 F at 93 relative humidity SIRA MC 050058 01 P...

Page 11: ...ent Synchronisation Belden 8760 Temperature Sensor Belden 8760 1 pair shielded twisted 18 AWG or equivalent maximum separation 183 m 600 ft can be run in conduit with transducer cable Communication RS 232 Belden 8770 3 wire shielded 24 AWG or equivalent maximum separation 15 m 50 ft Bipolar Current Belden 9552 2 pair shielded twisted 18 AWG or equivalent maximum separation 1 500 m 5 000 ft Note Th...

Page 12: ...Auxiliary Input Belden 8760 or equivalent 24 V Output Belden 8760 COMMUNICATION SOFTWARE Milltronics Utilities Software on standard PC floppy disk for DOS 3 1 and up 7ML19985AB01 OCM III 12 ...

Page 13: ...the OCM 3 in direct sunlight without the use of a sun shield This product is susceptible to electrostatic shock Follow proper grounding procedures 209 mm 8 2 lid screws 6 places 106 mm 4 2 91 mm 3 6 16 mm 0 6 285 mm 11 2 267 mm 10 5 programmer lid suitable location for conduit entrances mounting holes accessed under lid 4 3 mm 0 17 dia 4 places enclosure customer mounting screw Milltronics reccome...

Page 14: ...rce in accordance with IEC 1010 1 Annex H Relay 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 relay contacts shall be 250 V All field wiring must have insulation suitable for at least 250 V 14 OCM III 7ML19985AB01 ...

Page 15: ...ice customer alarm pump or control device customer device customer device customer device Milltronics CVCC mA output relay output auxiliary input velocity input RS 232 Maximum system capability Not all components or their maximum quantity may be required bi polar current Milltronics communication 15 OCM III 7ML19985AB01 ...

Page 16: ...f 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 Ground shield at OCM 3 only In order to compensate for uniform temperature change in the air between the transducer and the flow surface the temperature sensor must be connected to the OCM 3 Hazardous voltage present on transducer terminals during ope...

Page 17: ...ed by fuses having ratings not exceeding the rating of the relays isolated 0 or 4 to 20 mA output P26 into 1 KΩ load maximum Wiring should conform to standard instrumentation practices Ground shield at OCM 3 only relays shown in de energized state contacts rated at 5 A at 250 V non inductive n c comn o n c comn o n c comn o 17 OCM III 7ML19985AB01 ...

Page 18: ...e sharing a common conduit the OCM 3s should be synchronized In order to synchronize OCM 3s remove jumper J1 on board A on all but one OCM 3 interconnect the SYNC terminal TB1 20 of all OCM 3s Insure that all OCM 3s share a common ground TB1 34 18 OCM III 7ML19985AB01 ...

Page 19: ...uipment must be protected by 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 proximity to the equipment and within easy reach of the operator 9 to 30 Volt dc input negative dc input TB1 24 is tied to ground TB1 34 DC POWER dc terminals shall be supplied from SELV source in accorda...

Page 20: ...HE PROGRAMMER 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 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 packa...

Page 21: ...sen 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 access to D F P and U parameters scrolls Forward through the parameters enters content of entry field scrolls Backward through the parameters clears content of entry field negative scrolls through sel...

Page 22: ...es have been completed the OCM 3 may be powered up Upon initial powering up the unit momentarily displays and then scrolls through the available languages The OCM 3 is asking which language you prefer to communicate in English language selected advance to F0 F0 enter security code 0 language English 0 7ML19985AB01 OCM III 22 ...

Page 23: ...ed all the required parameters For optimum calibration accuracy an F13 should be performed prior to accessing F2 the normal operating mode enter the current head The OCM 3 calculates P46 and automatically enters the value e g 1 6 0 P1 dimensional units 0 centimeters F13 auto zero calibration P0 language 0 English F13 auto zero calibration 0 completed P0 language 0 English 3 1 8 2 8 7 2 1 F13 auto ...

Page 24: ... now complete Enter F2 to place the OCM 3 in the normal operating mode Note To save parameter values return to RUN mode F2 after programming The OCM 3 now displays the flow rate and total Refer to Operation Display F4 24 hr time 1141 4 1 1 F4 24 hr time 11 41 00 enter new time F5 ddmmyyyy date F5 ddmmyyyy date 12 10 1492 enter new date 0 1 4 2 9 2 1 1 2 F4 24 hr time 4 1 7ML19985AB01 OCM III 24 ...

Page 25: ...e 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 D0 for accurate head measurement 7ML19985AB01 OCM III 25 ...

Page 26: ...7ML19985AB01 OCM III 26 ...

Page 27: ...e clock The memory battery B1 provides up to one year of memory retention see Appendices Maintenance Note To save parameter values return to RUN mode F2 after programming SECURITY The content of all A D F P and U parameters can be viewed without having to satisfy the security parameter F0 However if it is desired to change the content of any of these parameters the security parameter must be satis...

Page 28: ...cient that the user know the flow rate Qcal which occurs at maximum head hcal On the other hand absolute calculations require that the user enter information such as the physical dimensions of the primary 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 primary element is Q KHx the specific fo...

Page 29: ...se without sacrificing stability The reading damping P13 dampens only the flow rate reading of the Flow and Total display 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 ...

Page 30: ...zer factor P32 relay 1 setpoint P16 100 P32 5 2 P16 50 units pulse The status of each relay is shown in the display Refer to Flow and Total Display 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 assi...

Page 31: ...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 F0 In order to adjust the rate of filling of the totalizer the totalizer multiplier P32 can be set to an appropriate ...

Page 32: ...oint units are change of maximum flowrate per minute of maximum flowrate and of maximum head respectively The setpoints represent the absolute 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 Truncatio...

Page 33: ...Viewing the data log 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 7ML19985AB01 OCM III 33 ...

Page 34: ... satisfying the security parameter F0 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 F0 does not need to be satis...

Page 35: ...sociated 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 F0 Cold Start If it is desired to reset all parameters logs and totalizers to their fa...

Page 36: ...9 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 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 derive...

Page 37: ...e 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 ...

Page 38: ...rature D7 minimum temperature D8 velocity D9 nominal target range D10 analog milliamps D11 internal DC volts D12 velocity volts D13 auxiliary input volts D14 temperature sensor ohms D15 self test checksum D16 restarts D17 exceptions D18 valid echos per 100 security access required applicable to flow calculations requiring velocity sensor 7ML19985AB01 OCM III 39 ...

Page 39: ...7ML19985AB01 OCM III 40 ...

Page 40: ... software identification number F7 view min max data F8 reset min max data F9 self check F10 change security code F11 reset master totalizer F12 force a cold start F13 auto zero calibration F14 examine data log task view daily totals view flow rates view min max data method first day last day specified day F15 clear data log security access required 7ML19985AB01 OCM III 41 ...

Page 41: ...7ML19985AB01 OCM III 42 ...

Page 42: ...es per second P2 temperature units 0 Celcius 1 Fahrenheit P3 primary element 0 exponential device 1 BS 3680 Rectangular Flume 2 BS 3680 Round Nose Horizontal Crest Weir 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...

Page 43: ...e 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 he...

Page 44: ...te 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 ...

Page 45: ...l 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 P16 P19 P22 relay 1 2 3 high setpoint P17 P20 P23 relay 1 2 3 low setpoint P24 mA assignment 0 flow rate 1 head 2 velocity 3 temperature P25 If custom mA 20 mA 0 normal 0 custom P26 ...

Page 46: ...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 0 x 1 1000 0 001 1 x 1 100 0 01 2 x 1 10 0 1 3 x 1 4 x 10 5 x 100 6 x 1000 P33 flow rate display decimal point 0 no decimal places 1 1 2 2 3 3 4 4 7ML19985AB01 OCM III 47 ...

Page 47: ...inutes 2 interval to be in hours 3 print once each day 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 7ML19985AB01 OCM III 48 ...

Page 48: ... 5 min 26 30 1 14 24 hr 15 min 27 30 5 15 15 1 min flow 28 60 1 16 15 5 29 60 5 17 30 1 30 24 hr 1 min 18 30 5 31 24 hr 5 min 32 24 hr 15 min P40 log rapid setpoint P39 variable logging condition units flow min change of maximum flow per minute flow of maximum flow head of maximum head P41 log normal setpoint P39 variable logging condition units flow min change of maximum flow per minute flow of m...

Page 49: ...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 7ML19985AB01 OCM III 50 ...

Page 50: ...rded P3 primary element 0 exponential device e g proportional V notch Parshall etc 1 BS 3680 Rectangular Flume ISO 4359 2 BS 3680 Round Nose Horizontal Crest Weir ISO 4374 3 BS 3680 Trapezoidal Flume ISO 4359 4 BS 3680 U throated Flume ISO 4359 5 BS 3680 Finite Crest Weir ISO 3846 6 BS 3680 Thin Plate Rectangular Weir ISO 1438 1 7 BS 3680 Thin Plate V Notch Weir ISO 1438 1 8 Rectangular Weir contr...

Page 51: ...g Area x Velocity 19 Egg shaped Area x Velocity 20 Universal Area x Velocity The primary element must be installed in accordance with the manufacturers recommendations and in accordance with all governing regulations 7ML19985AB01 OCM III 52 ...

Page 52: ...ain from manufacturer s specifications Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q k hx where q flowrate x exponent U0 k constant factor U1 h head RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal h hcal x where q flowrate qcal flowrate at maximum head h head hcal maximum head x exponent U0 Refer to manufacturers specifi...

Page 53: ...minimum distance of 3 times the maximum head i e where the liquid surface is not affected by drawdown transducer Rectangular suppressed U 0 1 5 V notch or Triangular U 0 2 5 Sutro Proportional U 0 1 symmetrical or asymmetrical Trapezoidal Cipolletti U 0 1 5 The transducer must be above the maximum head by at least the blanking value P47 minimum 3 x h max 7ML19985AB01 OCM III 54 ...

Page 54: ...lows 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 15 cm 6 plan 0 head front side transducer 7ML19985AB01 OCM III 55 ...

Page 55: ...ree 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 2 3 C C plan side front 0 head transducer 7ML19985AB01 OCM III 56 ...

Page 56: ...e following table converging side front 0 head transducer diverging plan Q throat point of measurement 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 7ML19985AB01 OCM I...

Page 57: ...0 5 x Cv x Cs x Cd x B x h1 5 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 qcal x Cd Cdcal x Cv Cvcal x h hcal 1 5 where q flow rate qcal flow rate at maximum head h head hcal maximum head Cv velocity coefficient Cvcal velocit...

Page 58: ...BS 3680 RECTANGULAR FLUME 3 to 4 x hmax L transducer h 0 head p The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 59 ...

Page 59: ... x Cv x Cs x Cd x b x h1 5 where q flow rate 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 qcal x Cd Cdcal x Cv Cvcal x h hcal 1 5 where q flow rate qcal flow rate at maximum head h head hcal maximum head Cv velocity coefficient Cvcal velocity c...

Page 60: ...BS 3680 ROUND NOSE HORIZONTAL CREST WEIR transducer 3 to 4 x hmax The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 61 ...

Page 61: ...ere q flow rate 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 qcal x Cs Cscal x Cd Cdal x Cv Cvcal x h hcal 1 5 where q flow rate Cscal shape coefficient for maximum head qcal flow rate at maximum head Cv velocity coefficient h head Cvcal veloci...

Page 62: ...BS 3680 TRAPEZOIDAL FLUME p side transducer plan L end p h B 3 to 4 x hmax b The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 63 ...

Page 63: ...ow 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 qcal x Cu Cucal x Cd Cdcal x Cv Cvcal x h hcal 1 5 where q flow rate qcal flow rate at maximum head h head hcal maximum head Cu shape coefficient for head Cucal shape coefficient for maximum ...

Page 64: ...BS 3680 U FLUME L p h D 3 to 4 x hmax Da transducer 0 head The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 65 ...

Page 65: ... x b x h1 5 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 x Cp Cpcal x h hcal 1 5 where q flow rate qcal flow rate at maximum head h head hcal maximum head C discharge coefficient for head Ccal disch...

Page 66: ...BS 3680 FINITE CREST WEIR transducer 3 to 4 x hmax The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 67 ...

Page 67: ... by the equation q Ce x 2 3 2g x be x he 1 5 where q flow rate Ce a function of h p b and B g gravitational acceleration be effective crest width b Kb b crest width he effective head h Kh h head Kh 1 mm RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal x Ce Cecal x h hcal 1 5 where q flow rate qcal flow rate at maximum head h head hcal maximum head Ce discharge c...

Page 68: ...BS 3680 THIN PLATE RECTANGULAR WEIR 4 to 5 x hmax transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 69 ...

Page 69: ...2 x 2g 0 5 x h2 5 where q flow rate h head g gravitational acceleration Ce function of h and α α notch angle alpha 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 qcal x Ce Cecal x h hcal 2 5 where q flow rate qcal flow rate at maximum head h head hcal maximum head Ce discharge coeffici...

Page 70: ...BS 3680 THIN PLATE V NOTCH WEIR transducer 4 to 5 x hmax The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 71 ...

Page 71: ...e ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q K x b 0 2h x h1 5 where q flow rate h head K constant RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal x b 0 2h b 0 2hcal x h hcal 2 5 where q flow rate qcal flow rate at maximum head h head hcal maximum head Refer to Operation Flow Calculation 7ML19985AB01 OCM III 72 ...

Page 72: ...RECTANGULAR WEIR CONTRACTED transducer 4 to 5 x hmax The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 73 ...

Page 73: ...t can be calculated by the equation q K n x f h x s0 5 where q flow rate h head K constant f h A x R0 66 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 hcal where q flow rate h head qcal flow rate at maximum head hcal maximum head Refer to Operation Flow Cal...

Page 74: ...UND PIPE h 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 7ML19985AB01 OCM III 75 ...

Page 75: ...ain from manufacturer s specifications Reference RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal x f h hmax f hcal hmax where q flow rate qcal flow rate at maximum head h head hcal maximum head f h hmax is determined by polynomial synthesis Refer to Operation Flow Calculation 7ML19985AB01 OCM III 76 ...

Page 76: ...ME D pipe or sewer diameter 0 head D 2 point of measurement transducer for rated flows under free flow conditions The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 77 ...

Page 77: ...vice obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal x f h hmax f hcal hmax where q flow rate qcal flow rate at maximum head f h hmax and f hcal hmax are determined by polynomial synthesis Refer to Operation Flow Calculation 7ML19985AB01 OCM III 78 ...

Page 78: ...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 4 5 40 5 16 19 For rated flows under free flow conditions the head is measured at a point downstream from the flume entrance Refer to the following table The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 79 ...

Page 79: ...the last point A2n 2 A2n 1 generally being at maximum head U parameters required U0 number of data points n 4 to 16 Aeven head Aodd flow rate obtain from manufacturer s specifications Reference RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal x f h f hcal where f h and f hcal are polynomials based on interpolation of data points Refer to Operation Flow Calculati...

Page 80: ... 0 6 head point 3 A16 1 4 head point 9 A5 0 7 flow point 3 A17 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 Head A even A odd F l o w R a t e For best accuracy concentrate data points where changes in flow rate are the ...

Page 81: ...ION P4 0 For flows that can be calculated by the equation q 1 1000 x B x h x V where q flow rate in l 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 qcal x A Acal x v vcal where q flow rate qcal flow rate at maximum head h head hcal maximum head v velocity vcal velocity at maximum head Refer to Operation F...

Page 82: ...RECTANGULAR AREA X VELOCITY transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 83 ...

Page 83: ...be calculated by the equation q 1 1000 x b mh x v 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 RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal x A Acal x v vcal A b mh x h Acal b mhcal x hcal m B b d where q flow rate l sec B channel top width cm b channel bottom width cm...

Page 84: ...TRAPEZOIDAL AREA X VELOCITY transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 85 ...

Page 85: ... for h d q 1 1000 x b md d B h d x v for h d m 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 for h d A b mh x h Acal b mhcal x hcal for h d A b md x d B h d Acal b md x d B hcal d m B b d where q flow rate d d...

Page 86: ...MODIFIED TRAPEZOIDAL AREA X VELOCITY transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 87 ...

Page 87: ...X VELOCITY P3 16 U parameters required U parameters calculated U0 base diameter D U1 area h obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter 7ML19985AB01 OCM III 88 ...

Page 88: ...U CHANNEL AREA x VELOCITY transducer The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 89 ...

Page 89: ... VELOCITY P3 17 U parameters listed U parameters calculated U0 conduit diameter ID U1 area h obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter 7ML19985AB01 OCM III 90 ...

Page 90: ...AREA X VELOCITY h 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 7ML19985AB01 OCM III 91 ...

Page 91: ...d U parameters calculated U0 channel base width b U4 area h U1 lower angle alpha α U2 upper angle beta β U3 transition height ht obtain from manufacturer s specifications calculated by OCM 3 May be viewed by accessing U parameter 7ML19985AB01 OCM III 92 ...

Page 92: ...GULL WING AREA X VELOCITY transducer V The transducer must be above the maximum head by at least the blanking value P47 7ML19985AB01 OCM III 93 ...

Page 93: ... Reference ABSOLUTE CALCULATION P4 0 For flows that can be calculated by the equation q 1 1000 x A x v where q flow rate in l sec v flow velocity in cm sec RATIOMETRIC CALCULATION P4 1 For flows that can be calculated by the equation q qcal x A Acal x v vcal where q flow rate qcal flow rate at hcal A cross sectional area of flow Acal cross sectional area of flow at hcal v flow velocity Refer to Op...

Page 94: ...A X VELOCITY transducer standpipe 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 7ML19985AB01 OCM III 95 ...

Page 95: ...r 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 U0 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 c...

Page 96: ...oint 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 A odd A even Head Area 7ML19985AB01 OCM III 97 ...

Page 97: ...7ML19985AB01 OCM III 98 ...

Page 98: ...n general cleaning overall system performance checks and standard good housekeeping practices A periodic inspection of the transducer is recommended at which time any build up of material on the face should be removed The enclosure should be cleaned using a vacuum cleaner and a clean dry brush For battery replacement refer to Installation Installing the Memory Back up Battery 7ML19985AB01 OCM III ...

Page 99: ... system is locked 7 head exceeds BS 3680 spec 8 must use ratiometric 9 invalid angle size 10 invalid selection 11 value is view only 12 characterizer in use 13 feature not available 14 need whole number 15 invalid date 16 invalid time 20 can t zero auxiliary device 21 b must be greater than R r 7ML19985AB01 OCM III 100 ...

Page 100: ...s computers and PLCs When using 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 By terminating the bipolar current loop with a Milltronics CVCC the communication format is then converted to RS 232 Milltronics OCM 3 Utilities Software available provides conversion to RS 232 or 422 RS 232 customer s computer CVCC option...

Page 101: ...its 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 3 receive buffer is near empty the OCM 3 sends an XON signal to tell ...

Page 102: ...nection to computer computer serial port DB 9 connector computer serial port DB 25 connector 1 2 3 4 5 6 7 CVCC TB1 C O M M O N T R A N S M I T R E C E I V E S H E I L D T X D T X D S H L D S H L D 1 2 3 4 5 6 7 8 9 10 11 OCM 3 TB1 T X T X R X R X BIPOLAR I O CURRENT O P CURRENT O P 7ML19985AB01 OCM III 103 ...

Page 103: ...t 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 7 print interval set for 7 minutes Printing starts at 7 minutes after the hour and will occur every 7 minutes thereafter until 56 minutes into the hour The next print out would not occur until 7 minu...

Page 104: ...d by 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 7ML19985AB01 OCM III 105 ...

Page 105: ...mputer 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 W V 7ML19985AB01 OCM III 106 ...

Page 106: ...pose 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...

Page 107: ...er is the value stored in the parameter e g d4 50 this sets the minimum flow rate to 50 for D4 t0 totalizer value similar to that of the Flow and Total F2 display except that the multiplier is not displayed 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 10...

Page 108: ... code relay 1 2 3 0 0 0 0 1 1 0 0 2 0 1 0 3 1 1 0 4 0 0 1 5 1 0 1 6 0 1 1 7 1 1 1 l start data log down load l1 dd mm yyyy data log down load start date l2 dd mm yyyy data log down load end date l3 stop data log down load 7ML19985AB01 OCM III 109 ...

Page 109: ...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 ...

Page 110: ...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 ...

Page 111: ... the screen typical OK 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 com...

Page 112: ...ltronics Process Instruments Inc 1954Technology Drive P O Box 4225 Peterborough ON Canada K9J 7B1 Tel 705 745 2431 Fax 705 741 0466 Email techpubs smpi siemens com Siemens Milltronics Process Instruments Inc 2005 Subject to change without prior notice Printed in Canada ...

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