Siemens 7ML19985AB01 instruction manual Flume

Page 78

H-FLUME

transducer *

point of measurement

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
4.5	40.5		16.19

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

7ML19985AB01

OCM III

79

Image 78

Contents Open channel Unit Repair and Excluded Liability Contact Smpi Technical Publications at the following addressTable of Contents Start UP General Keypad Initial Start Up Fundamental ChecksOperation Maintenance Error Codes 100 Communications 101 7ML19985AB01 AppendicesOCM About this ShortIf you want to know about Read Product OCM » 20 to 50 C -5 to 122 F Specifications» range 20 or 4-20 mA » resolution IP65 enclosureProgrammer » CE *, FM, CSA NRTL/CTemperature Sensor TransducerCabling Communication Software Auxiliary InputOutput » Belden Installation Installing the OCM-3Outline and Mounting OCM-3 Layout System Diagram OCM-3Customer device Ground shield at OCM-3 only Basic Wiring Temperature Sensor Installing the TransducerInstalling the Temperature Sensor Ground shield at OCM-3 onlyMA Output RelaysSynchronization Power Connections AC PowerDC Power Disconnect power before installing or replacing the battery Installing the Memory BACK-UP BatteryInstalling the Programmer Communicating VIA ComputerStart UP GeneralKeypad Language Initial Start UPOCM-3 is asking which language you prefer to communicate EnglishP0 language English P1 dimensional units Centimeters F13 auto zero calibration 160 Completed 7ML19985AB01114100 Enter new time 114124-hr. time F5 ddmmyyyy date October 12Fundamental Checks OCM Security OperationMemory UnitsAbsolute vs. ratiometric Flow CalculationDisplay = constantFor battery operation, set display lighting to off or auto Damping» 20 mA For battery operation, have relays energizing on alarmExample For relay » P6 * flow rateFAIL-SAFE Flow Rate and TotalizingFlow rate Logging CapacityViewing the data log Temperature BlankingTime and Date Emulation Mode ResetVoltage Input Current Input Flow Velocity InputAuxiliary Head Input As normal 7ML19985AB01Diagnostic Aids DC Output100% head 4 m, enter 5 m Velocity Security access required‘D’ Parameter Listing Nominal target rangeOCM Enter security code Emulation mode ‘F’ Parameter ListingKeypad to mA output OCM ‘P’ Parameter Listing Linear Velocity= centimetres Gallons Flowrate Volume= absolute = ratiometric Flow rate units = imperial million gallons per dayOCM = 4-20 mA = 0-20 mA 7ML19985AB01 OCM OCM Fixed Variable conditionUnits OCM ‘U’ Parameters for P3 Primary Element OCM U0 = exponent U1 = k factor P4 = 0 only Reference= constant factor U1 = head Typical SHARP-CRESTED Weirs Typical Weir ProfilesKhafagi 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 Cv = velocity coefficient ¤ Refer to Operation \ Flow Calculation 7ML19985AB01BS-3680 Trapezoidal Flume BS-3680 U-Flume, P3 = BS-3680 U-FLUME = crest width = C = crest height = Cp = crest length = head H and p applied to CBS-3680 Finite Crest Weir = gravitational acceleration = Ce x 2⁄3 ⎯⎯√2⎯g x be x he1.5 Where q = flow rate= approach width = Ce = crest width = K b = crest height = crest width He = effective head h + Kh = head Kh = 1 mmBS-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 Based on the Manning Formula = hydraulic radius = slope of hydraulic gradientRound Pipe U0 = maximum flume width, hmax PALMER-BOWLUS Flume U0 = maximum listed head, hmax Flume Universal Head vs FLOW, P3 = U0 = number of data points n, 4 toFlow, point A17 Head, point A18 Flow, point A13 Head, point A14Flow, point A15 Head, point A16 Flow, point A19U0 = channel width B U1 = area h Rectangular Area X Velocity = head, cm = flow velocity, cm/sec Trapezoidal Area X Velocity = B b/d Where q = flow rate, l/s For h ≥ d= 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 Universal Area X VELOCITY, P3 = Typical open channelUniversal Area X Velocity Area HeadA10 = OCM Maintenance Error Codes Customer’s ComputerSerial printer Protocol for the OCM-3 is as follows Baud rate 102Bipolar Current DB-9 connectorDB-25 connector Refer to Cvcc InstructionDate P35 = 7, print interval set for 7 minutes104 Utilities Software Programmer Remote OCM-3 programming Remote OCM-3 display Local display105 106 00.000000 99.12399.123000 7ML19985AB01 Typical OCM-3Display value 107# = 0 through Content of P5 ResponseStart data log down load Stop data log down load109 Cable DB-25 connector 7ML19985AB01Standard modem Computer Telephone lines Remote modemEstablishing Communication Connect111 Ending Communication 112Rev