ADS Environmental Services Model 4000 530017 A0 - Manual (Page 106)

5-20 ADS Model 4000 Manual
Problem Velocity data seems erratic.
Possible
Causes
Velocity sensor may be dirty.
Velocity sensor may be faulty.
Velocity board may be faulty.
Possible
Solutions
Clean the velocity sensor.
Check the sensor connections.
Check the velocity parameters.
Contact a trained ADS technician.
Replace the velocity sensor.
Replace the velocity board.
Problem Velocity readings are abnormally high.
Possible
Causes
Wires on the P2 connector may be loose.
Doppler velocity sensor may be covered with silt.
Velocity sensor may be out of the flow.
Flow may be reversed or slower than 0.5 ft/s (0.15 m/s).
Possible
Solutions
Check the site conditions, and relocate the velocity
sensor if necessary.
Replace the velocity board.
Pressure Depth Subsystem
The following tables contain general troubleshooting techniques for
the pressure depth subsystem.
Warning: Contact a trained ADS technician for further
diagnosis before replacing a sensor.