Siemens HydroRanger 200 HMI, Operating Instructions Manual

Page: 138 / 404

Operating
7.11 External totalizers and flow samplers
HydroRanger 200 HMI
136
Operating Instructions, 06/2018, A5E36281317-AC
7.11.3 Flow sampler
7.11.3.1 Based on volume and time
To trigger a flow sampler relay based on flow, use Relay Function (2.8.1.4.) (Page 195) =
Flow Sampler and set the other parameters for the selected relay:
Counter formula
1 Contact per Multiplier (2.10.1.2.) (Page 211) x 10
Exponent (2.10.2.3.)
units
Operation Units source parameter
OCM [Sensor Mode (2.1.3.) (Page 163) = Flow
rate in open channel]
Maximum Flow (2.13.4.3.) (Page 243) or
Flowrate Units (2.13.4.7.) (Page 245)
By using a mantissa [Mantissa (2.10.2.2) (Page 213)] and an exponent [Exponent
(2.10.2.3.) (Page 214) ], the relay contacts can be based on a volume other than a multiple
of ten.
During the periods of low flow, the sampler may be idle for lengths of time. Program Relay
Interval Setpoint (2.8.2.4.) (Page 202) to a time interval in hours, to drive the sampler. The
sampler will operate based on the volume of flow or the time interval, whichever comes first.