ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 339)

Maintenance and Troubleshooting 8-55
Peak Velocity Subsystem
The following tables contain general troubleshooting techniques for
the velocity subsystem corresponding to the Peak Combo Sensor,
Surface Combo Sensor (Surcharge Velocity Sensor only), and
Slimline Peak Combo Sensor. 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 IETG representative for
further diagnosis prior to replacing a sensor.
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 25 mm (1.0 in) up from the bottom
of the Peak Combo Sensor or Slimline 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 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 IETG representative.
Replace the sensor.
Replace the monitor if defective.