ADS Environmental Services FlowShark QR 775003 A2 - Manual (Page 210)

Maintenance and Troubleshooting 8-25
Problem Range from ultrasonic depth subsystem is significantly
greater than manually measured range.
Possible
Causes
Physical offset may be incorrect.
Pipe height may be incorrect.
Sensor may not be level.
Foam or other substance may be absorbing the pulse.
Sensor may be faulty.
Possible
Solutions
Verify the physical offset.
Verify the pipe height.
Make sure the sensor is level and in good condition.
Check the hydraulic conditions in the pipe.
Fire the sensor at a shorter distance onto a hard surface
to confirm accuracy.
Replace the sensor.
Contact your regional ADS representative.
Problem Range from the ultrasonic depth subsystem is too short
(but not zero).
Possible
Causes
Physical offset may be incorrect.
Pipe height may be incorrect.
Sensor may be dirty.
Sensor may be faulty.
Possible
Solutions
Verify the physical offset.
Verify the pipe height.
Clean the sensor.
Replace the sensor.
Contact your regional ADS representative.