ADS 507165, Installation, Operation And Maintenance Manual

Page: 461 / 535

Maintenance and Troubleshooting 11-63
Peak Velocity Subsystem
The following tables contain general troubleshooting techniques for
the velocity subsystem corresponding to the AV|Max, Peak Combo
Sensor and Surface Combo sensor (
Surcharge Velocity Sensor
only ). Since the Surface Combo sensor is mounted at the top of the
pipe, potential issues involving a sensor that is out of the flow do
not apply to the Surface Combo sensor.
Note:
Contact your regional ADS representative for
further diagnosis prior to replacing a sensor or monitor.
Problem
Monitor often provides a velocity reading of 0.
Possible
Causes
Sensor’s velocity transmit/receive surfaces may be dirty
or the velocity function is broken.
Minimum flows may be occurring within the sensor
deadband (extending 1.0 inches (25 mm) up from the
bottom of the Peak Combo Sensor).
Cabling between the processor board and the velocity
sensor may be bad.
Velocity parameters may require adjustment.
Possible
Solutions
Clean the sensor’s transmit/receive surfaces.
Verify that minimum flows are occurring outside the
sensor deadband.
Check the velocity parameters.
Inspect the sensor cables for tightness.
Check for moisture in the connector.
Contact your regional ADS representative.
Replace the sensor.
Replace the monitor if defective.