Greyline Instruments OCF 5.0, User Manual

Page: 26 / 41

Page 26
OCF 5.0 Open Channel Flow Monitor
FIELD TROUBLESHOOTING
SYMPTOMS CHECK
Display - full scale A
- zero B
- erratic - random C
- drifting up D
- drifting down E
ECHO LOSS
prompt - flashing F
Calibration Non-Linear H
SYMPTOMS FAULTS SOLUTIONS
Unit “See’s” Wrong Target Due To:
A - sensor cover not removed - remove protective cover after installation
A,C,D,F - sensor not aimed correctly
A,D,F - dust/dirt buildup on sensor - clean carefully (do not scratch sensor face)
A,D,F - condensation on sensor - lower Sensor
- insulate sensor mounting location
- increase
Min Range ( CALIBRATION menu) by
1-3” / 2.5-7.5 cm
- wipe sensor face and body with Rain-X
A,D - sensor mounting stand pipe
- too long / - too narrow
- dirty / - gasket intruding - lower Sensor below stand pipe intrusion
C,E - very turbulent flow in open channel - increase Damping ( CALIBRATION menu)
- install stilling well on flume or weir
C,E - very turbulent level in tank - increase
Damping
(
CALIBRATION
menu)
- change tank fill method
Unit Picks-Up Interference Due To:
A,C - noise from high pressure fill - install submerged fill pipe
A,D - sensor coupling over tightened - hand tighten only (like a light bulb)
A,D - sensor coupling not used - use coupling supplied
C - other ultrasonic unit in close proximity - synchronize
Electrical interference:
C - sensor cable connections reversed
C - through sensor cable - use properly grounded metal conduit