ADS 507165, Инструкция по установке, эксплуатации и обслуживанию, Страница: 463 / 535

Maintenance and Troubleshooting 11-65
Problem
Velocity data seems erratic or exhibits poor quality.
Possible
Causes
Sensor’s transmit/receive surfaces may be dirty.
Sensor may be close to extending out of the flow.
Designated value for the maximum velocity parameter
may be too high, creating too broad of a range.
Transmit Frequency setting may be incorrect.
Sensor may be faulty.
Processor board may be faulty.
Possible
Solutions
Clean the sensor’s transmit/receive surfaces.
Verify whether the flow depth exceeds the sensor
deadband at the same time and under the same
conditions as the erratic data. Rotate the sensor further
toward the center of the pipe if possible.
Change the Transmit Frequency . It should be set to
High for optimal performance.
Reduce the maximum velocity in the device parameters
to narrow the range.
Check the sensor connections.
Contact your regional ADS representative.
Replace the sensor.
Replace the monitor if defective.
Problem
Velocity readings are abnormally high.
Possible
Causes
Sensor’s velocity transmit/receive surfaces may be
covered with silt or other debris.
Sensitivity setting may be too high.
Sensor may be extending out of the flow.
Flow may be reversed or slower than (0.5 feet per
second (0.15 mps)
Possible
Solution
Check the site conditions, and relocate the sensor if
necessary.
Check the velocity parameters.