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DFM 5.1 Doppler Flow Meter
Possible Causes:
Corrective Action:
METER READING DOES NOT TRACK FLOW
Sensor and GND wires reversed or not properly
connected
Check Sensor connections
Improper AC power input Ground
Use direct connection with 12 AWG wire to
nearest Ground pole (<1 ohm resistance).
SENSOR CABLE RESISTANCE TEST
Unplug the green sensor terminal from the Doppler board and connect the sensor wires as shown. With a
multimeter, perform resistance checks for each set of wires. One single loose terminal may cause false
readings.
Test across shield and core of each wire: TMTR (black/white) and RCVR (black). Resistance should be
around 82.5K ohms for any cable length. High readings indicate an open circuit and low readings
indicate a short or partial short in the sensor cable.
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