ADS Environmental Services Model 3600 530002 A2 - Manual (Page 115)

7-8 ADS 3600 Flow Monitor O&M Manual
Doppler Velocity Subsystem
Use the following tips to help resolve problems with the Doppler velocity subsystem.
Warning: Prior to replacing a sensor, contact an ADS trained technician for
further diagnosis.
Problem A data value of 0 is read often.
Possible Cause The Doppler velocity sensor may be dirty, weakened, or broken. The cabling between the
velocity board and the velocity sensor may be bad. The velocity board may be faulty.
Solution Clean the velocity sensor.
Check the velocity parameters in QuadraScan and adjust them if necessary.
Verify that the cables to the velocity sensor are tight and that the connector is free from
moisture.
If the problem is still unresolved, contact an ADS trained technician for further information
about replacing the velocity sensor.
If the problem persists, replace the monitor and send the old one to ADS for service.
Problem Velocity data is flat (the data is non-zero but does not fluctuate much).
Possible Cause The velocity sensor may be dirty or weakened.
Solution Clean the velocity sensor.
Check the velocity sensor connections.
Check the velocity parameters in QuadraScan and adjust them if necessary.
If the problem is still unresolved, contact an ADS trained technician for further information
about replacing the velocity sensor.
If the problem is still unresolved, replace the monitor and send the old one to ADS for
service.
Problem The velocity data seems erratic.
Possible Cause The velocity sensor may be dirty or faulty. The velocity board may be faulty.
Solution Clean the velocity sensor.
Check the sensor connections.
Check the velocity parameters in QuadraScan and adjust them if necessary.
If the problem is still unresolved, contact an ADS trained technician for further information
about replacing the velocity sensor.
If the problem is still unresolved, replace the monitor and send the old one to ADS for
service.