ADS 507165, Installation, Operation And Maintenance Manual, Page: 458 / 535

11-60 ADS Manual
Upward Depth Subsystem
The following tables contain general troubleshooting techniques for
the upward depth subsystem corresponding to the AV|Gated,
AV|Max and Peak Combo sensor.
Note:
Contact your regional ADS representative for
further diagnosis prior to replacing a sensor or monitor.
Problem
UpDepth data periodically reads 0.88 inches (22 mm).
Possible
Causes
Minimum flows are occurring within sensor deadband
(extending 1.0 inches (25 mm) up from bottom of Peak
Combo Sensor) or the sensor is receiving a strong
return signal close to the sensor face.
Sensor transmit/receive surfaces are dirty.
Sensor or cabling might be faulty.
Possible
Solutions
Verify minimum flow depths are not occurring within
sensor deadband.
Set the deadband on the UpDepth sensor to a setting
other than
Auto , but well below the expected minimum
flow depth. Fire the sensor several times to verify
whether the readings improve.
Ensure the sensor is installed as closely as possible to
the 6:00 position in the pipe, silt allowing.
Clean the sensor transmit/receive surfaces.
Inspect the sensor cables for integrity.
Check for moisture in the connector.
Contact your regional ADS representative.
Replace the sensor.
Replace the monitor if defective.