Badger Meter MC4000 Diagnostic Test Equipment - Manual (Page 32)

APPendIx APPENDIX
Troubleshooting Guide
Symptom Possible Cause Remedy
Meter indicates higher than actual
flow rate
–Cavitation
–Debris on rotor support
–Build up of foreign materials in the
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 start-up 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 pick-up Replace pick-up
System works perfect, except indicates
lower flow over entire range
By-pass flow, leak
Repair or replace by-pass 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
Meter doesn't respond to any changes
in process inputs or keystrokes
Processor hang due to communications
interruption
Perform a hardware reset by inserting
the end of a paperclip into the
hardware reset hole on the left side of
the enclosure See Figure 5 .
OTEE: N For this procedure to work, the
charger must be disconnected
from the MC4000
Page 32 Month 2014