Greyline Instruments A.1.1 Series - METER READING ERRATIC; NO FLOW INDICATION; METER READING TOO HIGH

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DFM 5.1 Doppler Flow Meter
Possible Causes:
Corrective Action:
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
Coupling compound washed out, or sensor loose on
pipe

Remount sensor
 Use Dow Corning Silicone #4
Power interruption. No flow.

Check fuse/breaker. Confirm flow
METER READING TOO HIGH
Calibration error

Review UNITS/MODE menu and Pipe ID
Vibration or noise on the pipeline

Install in another location.
Pipe is not full

Remount Sensor on vertical pipe
Nearby velocity increasing device (pump, valve, orifice
plate)

Relocate sensor >30 pipe diameters from
velocity increasing device
Local electrical noise

Ensure all Flowmeter wiring is in METAL
conduit and sensor cable shield is connected to
Ground stud
Variable Speed Drive interference

Follow Drive manufacturers wiring and
Grounding instructions
 Relocate Flowmeter electronics, Sensor and
wiring away from VSD