Troubleshooting Problem Causes - GF UD2100 Betriebsanleitung

UD2100 Ultrasonic Doppler Flow Meter
7 Troubleshooting
7.1 Problem causes
METER READING LOWER THAN EXPECTED
Possible Causes
Calibration Error
Lower flow rate than expected
Improper mounting of sensor
Pipe is not full
METER READING WHEN THERE IS NO FLOW
Possible Causes
Local electrical noise
Cross talk between two or more GF
UD2100 flowmeters on same pipe
Variable Speed Drive interference
Sensor cable connections incorrect or
loose
METER READING ERRATIC
Possible Causes
Sensor mounted too close to valve, pump
or elbow
NO FLOW INDICATION
Possible Causes
Not enough suspended particles or gases
in the fluid
Coupling compound washed out, or sensor
loose on pipe
Power interruption. No flow.
30
Corrective Action
• Review UNITS/MODE menu and Pipe ID.
• Investigate pump/valves. Compare velocity with alternate instrument
• Check "Cal Constant" in Special Functions menu.
• Reinstall Sensor with careful application of Coupling Compound.
• Remount Sensor on vertical pipe.
Corrective Action
• Adjust Signal Cutoff in Calibration Menu.
• 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.
• Refer to Synchronization instructions.
• Follow Drive manufacturers wiring and Grounding instructions.
• Relocate Flowmeter electronics, Sensor and wiring away from VSD.
• Refer to Connections diagram. Disconnect and reconnect sensor cables
ensuring that cable is properly inserted into terminals and tightened.
Corrective Action
• Change sensor placement. Recommended 6-10 diameters from elbows, and
30 diameters from pumps, controlling valves, orifice plates, nozzles or open
pipe discharge.
Corrective Action
• Relocate sensor in more turbulent pipe section.
• Mount sensor at 12 o'clock position on horizontal pipe
• Remount sensor
• Use Super Lube ®
• Check fuse/breaker. Confirm flow
Operating Instructions