IM-P505-02-US Issue 1
81
UTM20 Series Ultrasonic Transit-time Flowmeters
Symptom: Unstable flow.
Possible
Causes
Installation issues
Flow instability
Transducer mounting is loose
Transducers are moved
Incorrect flow settings
Recommended
Action
Check process loop for variations of entrained air which will impact the flow
Check for pump induced flow instability
Check that the transducers are secure and are in area where the transducers will not be
inadvertently bumped or disturbed
Check low flow cutoff, minimum flow or maximum flow settings
Symptom: Flow readout is opposite of the flow direction.
Possible
Causes
Integral mount transmitter is mounted in reverse flow direction so display is properly oriented
Up and down transducers wiring is reversed
Flow direction parameter is reversed
Recommended
Action
Change the transducer flow direction parameter
Rewire the up and down transducers to the transmitter
Symptoms: Current, frequency or pulse outputs do not match the readings.
Possible
Causes
Incorrect parameter settings
Wiring or control system configuration issues
Recommended
Action
Verify that the parameters for the output are set properly
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