ADS Environmental Services FlowShark QR 775002 A4 - Manual (Page 237)

Maintenance and Troubleshooting 10-25
Problem Velocity data seems erratic.
Possible
Causes
Velocity sensor may be dirty.
Velocity sensor may be faulty.
Analog board may be faulty.
Possible
Solutions
Clean the velocity sensor.
Check the sensor connections.
Check the velocity parameters.
Contact your regional ADS representative.
Replace the velocity sensor.
Replace the monitor if defective.
Problem Velocity readings are abnormally high.
Possible
Causes
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.
Pressure Depth Subsystem
The following tables contain general troubleshooting techniques for
the pressure depth subsystem.
Warning: Contact your regional ADS representative for
further diagnosis before replacing a sensor.