ADS 507165, Installation, Operation And Maintenance Manual

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Maintenance and Troubleshooting 11-53
Long Range Depth Subsystem
The following tables contain general troubleshooting techniques for
problems with the ultrasonic depth subsystem corresponding to the
Long Range Depth Sensor.
Note:
Contact your ADS representative for further
diagnosis prior to replacing a sensor or monitor.
Problem Depth measured not matching invert flow levels
Possible
Causes
Manhole depth is greater than sensor range (20 feet).
Manhole depth may be incorrect.
Physical offset may be incorrect.
Sensor may not be positioned correctly over the invert.
Something may be obstructing the sensor.
Sensor and/or mounting bar may not be level.
Possible
Solutions
Install the sensor within prescribed range.
Verify the manhole depth, and adjust if necessary.
Verify the physical offset, and adjust if necessary.
Reposition the Mounting Bar so sensor is directly over
the invert.
Neatly coil and cables and/or relocate
monitor.
Verify the sensor and Mounting Bar are level, and adjust
if necessary.