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DFM 5.1 Doppler Flow Meter
FIELD TROUBLESHOOTING
Possible Causes:
Corrective Action:
METER READING LOWER THAN EXPECTED
Calibration Error
Review UNITS/MODE menu and Pipe ID
Lower flow rate than expected
Investigate pump/valves. Compare velocity
with alternate instrument
Signal not penetrating far enough into the flow stream
Relocate sensor closer to elbows or flow
disturbances
Improper mounting of sensor
Reinstall Sensor with careful application of
Coupling Compound
Pipe is not full
Remount Sensor on vertical pipe
METER READING WHEN THERE IS NO FLOW
Vibration on pipe
Adjust Status / Signal Cutoff setting
Install in another location
Local electrical noise
Ensure all Flowmeter wiring is in METAL
conduit and sensor shield is properly grounded.
Ensure correct power input Ground connection
(<1 ohm resistance).
Ensure 4-20mA Shield connected to Instrument
Ground stud.
Cross talk between two or more DFM 5.1 flowmeters
on same pipe
Refer to Synchronization instructions
Variable Speed Drive interference
Follow Drive manufacturers wiring and
Grounding instructions
Relocate Flowmeter electronics, Sensor and
wiring away from VSD
Sensor cable connections incorrect or loose
Refer to Connections diagram. Disconnect and
reconnect sensor cables ensuring that cable is
properly inserted into terminals and tightened.
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