Siemens 7ML19985AB01 = absolute = ratiometric Flow rate units, Flowrate Volume, Gallons

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13 = Rectangular Area x Velocity

14 = Trapezoidal Area x Velocity

15 = Modified Trapezoidal Area x Velocity

16 = U-channel Area x Velocity

17 = Circular Area x Velocity

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
7ML19985AB01		OCM III		44

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Contents Open channel Contact Smpi Technical Publications at the following address Unit Repair and Excluded LiabilityTable of Contents General Keypad Initial Start Up Fundamental Checks Start UPOperation Appendices Maintenance Error Codes 100 Communications 101 7ML19985AB01OCM Short About thisIf you want to know about Read Product OCM IP65 enclosure Specifications» range 20 or 4-20 mA » resolution » 20 to 50 C -5 to 122 F» CE *, FM, CSA NRTL/C ProgrammerTransducer Temperature SensorCabling Auxiliary Input Communication SoftwareOutput » Belden Installing the OCM-3 InstallationOutline and Mounting OCM-3 Layout OCM-3 System DiagramCustomer device Ground shield at OCM-3 only Installing the TransducerInstalling the Temperature Sensor Ground shield at OCM-3 only Basic Wiring Temperature SensorRelays MA OutputSynchronization AC Power Power ConnectionsDC Power Communicating VIA Computer Installing the Memory BACK-UP BatteryInstalling the Programmer Disconnect power before installing or replacing the batteryGeneral Start UPKeypad English Initial Start UPOCM-3 is asking which language you prefer to communicate LanguageF13 auto zero calibration 160 Completed 7ML19985AB01 P0 language English P1 dimensional units CentimetersF5 ddmmyyyy date October 12 114124-hr. time 114100 Enter new timeFundamental Checks OCM Units OperationMemory Security= constant Flow CalculationDisplay Absolute vs. ratiometricDamping For battery operation, set display lighting to off or auto» P6 * flow rate For battery operation, have relays energizing on alarmExample For relay » 20 mAFlow Rate and Totalizing FAIL-SAFEFlow rate Capacity LoggingViewing the data log Blanking TemperatureTime and Date Reset Emulation ModeAs normal 7ML19985AB01 Flow Velocity InputAuxiliary Head Input Voltage Input Current InputDC Output Diagnostic Aids100% head 4 m, enter 5 m Nominal target range Security access required‘D’ Parameter Listing VelocityOCM ‘F’ Parameter Listing Enter security code Emulation modeKeypad to mA output OCM Linear Velocity ‘P’ Parameter Listing= centimetres = imperial million gallons per day Flowrate Volume= absolute = ratiometric Flow rate units GallonsOCM = 4-20 mA = 0-20 mA 7ML19985AB01 OCM OCM Variable condition FixedUnits OCM ‘U’ Parameters for P3 Primary Element OCM Reference U0 = exponent U1 = k factor P4 = 0 only= constant factor U1 = head Typical Weir Profiles Typical SHARP-CRESTED WeirsKhafagi Venturi Typical Parshall Flume Typical Leopold Lagco ‘U’ parameters required ‘U’ parameters calculated BS-3680 Rectangular Flume = crest width = Cv = crest height = Cd = crest length = a BS-3680 Round Nose Horizontal Crest Weir ¤ Refer to Operation \ Flow Calculation 7ML19985AB01 Cv = velocity coefficientBS-3680 Trapezoidal Flume BS-3680 U-Flume, P3 = BS-3680 U-FLUME = head H and p applied to C = crest width = C = crest height = Cp = crest lengthBS-3680 Finite Crest Weir = crest width He = effective head h + Kh = head Kh = 1 mm = Ce x 2⁄3 ⎯⎯√2⎯g x be x he1.5 Where q = flow rate= approach width = Ce = crest width = K b = crest height = gravitational accelerationBS-3680 Thin Plate Rectangular Weir U0 = notch angle Alpha U1 = Ce BS-3680 Thin Plate V-NOTCH Weir U0 = crest width b Rectangular Weir Contracted = hydraulic radius = slope of hydraulic gradient Based on the Manning FormulaRound Pipe U0 = maximum flume width, hmax PALMER-BOWLUS Flume U0 = maximum listed head, hmax Flume U0 = number of data points n, 4 to Universal Head vs FLOW, P3 =Flow, point A19 Flow, point A13 Head, point A14Flow, point A15 Head, point A16 Flow, point A17 Head, point A18U0 = channel width B U1 = area h Rectangular Area X Velocity = head, cm = flow velocity, cm/sec Trapezoidal Area X Velocity For h ≥ d = B b/d Where q = flow rate, l/s= channel top width, cm = head, cm = channel base width, cm Modified Trapezoidal Area X Velocity U0 = base diameter D U1 = area h Channel Area x Velocity U0 = conduit diameter U1 = area h Circular Area X Velocity GULL-WING Area X VELOCITY, P3 = Gull Wing Area X Velocity EGG-SHAPED Area X VELOCITY, P3 = EGG-SHAPED Area X Velocity Typical open channel Universal Area X VELOCITY, P3 =Area Head Universal Area X VelocityA10 = OCM Maintenance Error Codes Computer Customer’sSerial printer 102 Protocol for the OCM-3 is as follows Baud rateRefer to Cvcc Instruction DB-9 connectorDB-25 connector Bipolar CurrentP35 = 7, print interval set for 7 minutes Date104 Remote OCM-3 display Local display Utilities Software Programmer Remote OCM-3 programming105 106 107 Typical OCM-3Display value 00.000000 99.12399.123000 7ML19985AB01Response # = 0 through Content of P5Stop data log down load Start data log down load109 Computer Telephone lines Remote modem DB-25 connector 7ML19985AB01Standard modem CableConnect Establishing Communication111 112 Ending CommunicationRev