Badger Meter 1200 - Manual (Page 11)

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