Hello, we are trying to add a second flow meter to a CR1000 that is already has P1 and P2 channels in use for a pulse count flow meter and a CS700 tip counter.
As such, we ordered a GPI G2 1/2"(1-10 GPM) flow meter that reports flow in 4-20mA.
We are having trouble getting flow to register on the data logger using the following instruction:
VoltDiff (MW02_Pond_FlowRate,1,mV2500,4,True,0,_60Hz,0.00625,-2.5)
Batteries are removed from the GPI meter and we have a 100ohm resistor bridging H and L on Diff channel 4.
We are powering the meter via one of the 12V channels on the logger. With the resistor in place, between H and L on diff 4, we read the offset of -2.5 only. With the resistor removed, we are reading an erroneous flow rate of 6GPM (no actual flow).
Any help is appreciated!
If the reading reports as just the offset, I suspect the flow sensor is not outputing a current. Check the wiring. The current loop needs a return to ground from the low side of the resistor.
12V > Sensor Supply
Sensor Return > H > 100 Ohm Resistor > L > G