FIELD TROUBLESHOOTING
SYMPTOMS
CHECK
Display
- full scale
- zero
- erratic - random
- drifting up
- drifting down
A
B
C
D
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
MinRg
(
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
RejTime
(
CALIBRATION
menu)
- install stilling well on flume or weir
C,E
- very turbulent level in tank
- increase
RejTime
(
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
C
- sensor cable extended and junction
not insulated
- use metal Junction Box
C
- through enclosure
- use metal enclosure
SLT32 Level & Flow Monitor
Manual Series B.11
Page 26
