Troubleshooting Guide
Page 10
June 2020
TRB-UM-00287-EN-07
TROUBLESHOOTING GUIDE
Trouble
Possible Cause
Remedy
Meter indicates higher than
actual flow rate
•
Cavitation
•
Debris on rotor support
•
Build up of foreign material
on meter bore
•
Gas in liquid
•
Increase back pressure
•
Clean meter
•
Clean meter
•
Install gas eliminator ahead
of meter
Meter indicates lower than
actual flow rate
•
Debris on rotor
•
Worn bearing
•
Viscosity higher than
calibrated
•
Clean meter and add filter
•
Clean meter and add filter
•
Recalibrate monitor
Erratic system indication,
meter alone works well
(remote monitor application
only)
Ground loop in shielding
Ground shield one place only�
Look for internal electronic
instrument ground� Reroute
cables away from electrical
noise
Indicator shows flow when
shut off
Mechanical vibration causes rotor
to oscillate without turning
Isolate meter
No flow indication
Full or partial open position
Fluid shock, full flow into dry
meter or impact caused bearing
separation or broken rotor shaft
Rebuild meter with repair kit
and recalibrate monitor� Move
to location where meter is full
on startup or add downstream
flow control valve
Erratic indication at low flow,
good indication at high flow
Rotor has foreign material
wrapped
around it
Clean meter and add filter
No flow indication
Faulty pickup
Replace pickup
System works perfect, except
indicates lower flow over
entire range
Bypass flow, leak
Repair or replace bypass valves,
or faulty solenoid valves
Meter indicating high flow,
upstream piping at meter
smaller than meter bore
Fluid jet impingement on rotor
Change piping
Opposite effects of above
Viscosity lower than calibrated
Change temperature, change
fluid or recalibrate meter
