ADS Environmental Services Model 4000 530017 A0 - Manual (Page 103)

Maintenance and Troubleshooting 5-17
Problem Ultrasonic depth readings are erratic.
Possible
Causes
Noise may exist in the sewer pipe.
Ultrasonic depth sensor may be dirty.
Flow may be choppy or foamy.
Ultrasonic depth sensor may not be level.
Pulse command and spare 2 delay parameters may be
set too low for the pipe.
Possible
Solutions
Check the flow conditions.
Clean the ultrasonic depth sensor.
Check the level of the ultrasonic depth sensor.
Review and adjust the pulse command and spare 2
delay parameters.
Problem Less than six good pairs are received when firing the
ultrasonic depth sensor.
Possible
Causes
Ultrasonic depth sensor may be dirty.
Ultrasonic depth sensor may be faulty.
Depth board may be faulty.
Possible
Solutions
Clean the ultrasonic sensor.
For less than four good sensor pairs, contact a trained
ADS technician.
Replace the ultrasonic depth sensor.
Replace the depth board.