User Manual

Maintenance a n d Troubleshooting 8-27
Problem
Ultrasonic depth readings are errat i c.
Possible
Causes
Noise m ay exist i n the sewer pipe.
Sensor m ay be di rt y.
Flow may be choppy or foamy.
Sensor m ay not be l evel .
Possible
Solutions
Check the flow conditions.
Clean the sens or.
Check the level of t he sensor.
Problem
Ultrasonic depth s ens or reports abnormal temperatures .
Possible
Causes
Sensor connec tion to monitor may be loos e.
Temperat ure sensor may be faulty.
Sensor m ay be f aul ty.
Possible
Solutions
Secure the sens or c onnection t o monit or (if necessary).
Replace the s ensor.
IS Doppl e r Vel oc ity Subsys tem
The following tables contain general troubleshooting techniques for
the Doppler velocity subsystem.
Note: Contact your regional ADS representative for
further diagnosis prior to replacing a sensor.