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PDFM 5.1 Portable 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
Variable Speed Drive interference
Follow Drive manufacturers wiring and
Grounding instructions
Relocate Flowmeter, Sensor and wiring away
from VSD
Sensor connections incorrect
Refer to Connections diagram
METER READING ERRATIC
Sensor mounted too close to valve, pump or elbow
Change sensor placement. Recommended 6-10
diameters from elbows, and 30 diameters from
pumps, controlling valves, orifice plates,
nozzles or open pipe discharge
NO FLOW INDICATION
Not enough suspended particles or gases in the fluid
Relocate sensor in more turbulent pipe section.
Mount sensor at 12 o'clock position on
horizontal pipe
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