Troubleshooting Guide
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 pickup .
Replace pickup .
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
OTEE:
N
For this procedure to work, the
charger must be disconnected
from the MC4000 .
Page 24
February 2015
TST-UM-00017-EN-03
