ADS Environmental Services Model 3600 530002 A2 - Manual (Page 116)

Troubleshooting 7-9
Problem The velocity data readings are abnormally high.
Possible Cause Wires on the P2 connector may be loose. The velocity sensor may be covered with silt.
The velocity sensor may be out of the flow. The flow may be reversed or slower than 0.15
m/s (0.5 ft/s).
Solution Check the site conditions and relocate the velocity sensor if necessary.
If the problem is still unresolved, replace the monitor and send the old one to ADS for
service.
Pressure Depth Subsystem
Use the following tips to help resolve problems with the pressure depth subsystem.
Warning: Prior to replacing a sensor, contact an ADS trained technician for
further diagnosis.
Problem The temperature reading from the pressure depth sensor shows a value of -273
°
C
(-459
°
F).
Possible Cause The cable connecting the pressure mouse to the monitor may be broken. The pressure
sensor may be faulty. The pressure depth board is not responding or may be faulty.
Solution Replace the pressure sensor with a known good sensor and send the faulty one to ADS for
repair.
If the problem is still unresolved, replace the monitor and send the old one to ADS for
service.
Problem The pressure depth subsystem data readings are consistently incorrect.
Possible Cause The coefficients are incorrect.
Solution Enter the correct coefficients and reactivate the monitor.
Problem The pressure depth subsystem data readings are consistently off by up to 7.62 cm (3 in.),
but temperature readings are accurate.
Possible Cause The pressure sensor has an offset that drifts over time.
Solution Check the condition of the pressure dryer tube.
Adjust the depth data by applying a delta offset to the readings until they match the values
obtained during confirmation.
Problem The pressure sensor temperature readings are incorrect, but depth data is accurate.
Possible Cause The temperature sensor may be faulty.
Solution Contact an ADS trained technician for further information about replacing the pressure
sensor.
If the problem is still unresolved, replace the monitor and send the old one to ADS for
service.