AW Gear Meters GEAR METERS - Manual (Page 14)

Positive Displacement Flow Meters
Operation and Installation Manual
13
Trouble-Shooting Guide
PROBLEM POSSIBLE CAUSE SOLUTION
Flow meter
indicates
lower than
actual.
Viscosity of fluid is less than 30 cst. Decrease the k-factor by percent error.
Excessive pressure differential across flow meter,
causing gears to bind.
Reduce flow rate, reduce fluid viscosity.
Debris in measuring chamber. Clean flow meter; change or add filter.
Upper housing has dimple from over tightening
sensor.
Replace upper housing.
Flow meter
indicates
higher than
actual.
Air in lines. Add air eliminator.
Electro-magnetic interference. Ground flow meter and all electronics.
Reverse fluid flow. Add check valve.
Indicator
shows flow
when there is
no flow. Fluid oscillates.
Check pump, add check valve, increase
backpressure.
Electro-magnetic interference.
Ground flow meter and all electronics.
Use shielded cable and relocate away
from electrical noise.
No flow
indication.
No fluid flow. Check pump.
Debris in measuring chamber or gears. Clean flow meter, change or add filter.
Sensor not installed properly.
Check sensor is installed to hand tight.
Review sensor guide.
Faulty wiring.
Check sensor connection and readout
connection.
Faulty sensor. Replace sensor.
Upper housing has dimple from over-tightening
sensor.
Replace upper housing.
Erratic
system
indication. Ground loop in shielding.
Ground shield one place only. Re-route
cables from electrical noise.
Pulsating fluid flow. Add pulse dampener.