Troubleshooting Guide
Page 7
April 2016
TRB-UM-00372-EN-03
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
