Manual

TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy
Meter indicates higher than
actual flow rate.
Cavitation.
Debris on rotor support.
Increase back pressure
Clean meter.
Meter indicates lower than
actual flow rate.
Debris on rotor.
Worn bearing.
Viscosity higher than calibrated.
Clean meter and add filter.
Replace meter.
Change temperature; change fluid;
recalibrate meter.
Erratic system indication,
meter alone works well.
Ground loop in shielding. Ground shield one place only.
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.
New bearing required. Move to location
where meter is full of fluid on startup.
Erratic indication at low flow,
good indication at high flow.
Low instrument sensitivity. 10 mV rms turbine
signal is being lowered by loading of electronics
or instrumentation can’t sense low level signals.
Amplify signal.
No flow indication. Faulty pickup. Replace pickup, recalibrate as necessary.
System works perfect, except
indicates lower flow over
entire range.
Bypass flow, leak.
Eliminate bypass valves, leak. Repair or
replace faulty solenoid valves.
Meter indicating high flow,
upstream piping at meter
smaller than meter bore.
Fluid jet impingement on rotor, critical in gas. Change piping.
Opposite effects of above. Viscosity lower than calibrated.
Change temperature, change fluid or
recalibrate meter.
Mass flow indication wrong. Wrong fluid density, critical in gas. Check fluid, electronics.
Erratic or wrong indication
of flow.
Loose pickup. Tighten pickup.
Does not repeat at low flows.
Repeats at high flow.
System resolution readability.
Increase resolution, that is,
1 out of 100 = 1%.
User Manual
Page 11 November 2013