Table 2-2: Troubleshooting
(continued)
Error
Recommended action(s)
—
If one or more components are still not updated, click
Download
to continue the upgrade process.
No power to the unit
•
Check for correct voltage (10.4 - 36 VDC) (refer to the System
Wiring Diagram (DMC-005324) in
Ultrasonic Flow Meter Drawings
).
•
Check the main power source for blown fuse or tripped circuit
breaker. Reference your “as built” installation drawings for your
location.
One or more of the
chords is not indicating a
reading (reporting zeros)
•
Check for loose connections at the cable connectors.
•
Check the resistance of the transducers (should be approximately 2
Ω).
•
Problem also may be caused by a bad Acquisition Module or
interconnect cable.
•
Check system status in the MeterLink program for any flagged
errors.
•
Check the CPU Module.
•
If Chord A is not indicating, Change the transducer cables from
Chord B to chord A. If Chord B then fails, the transducers are bad on
Chord A.
Power Failure
•
Meter has had power removed for a period of time or the meter
restarted itself such as after a firmware upgrade. The Audit log in
the meter indicates the power fail time.
—
If this was an unexpected restart of the meter, verify the
integrity of the power to the meter and make sure that the
voltage level is the in the range of 11-36 VDC at the meter.
—
If this was a known power fail or restart of the meter, just
acknowledge this alarm.
Sound velocity is outside
defined limits
•
The meter's measured average sound velocity is outside the defined
limits.
—
Verify that all chords are measuring the same Speed of Sound
within about 0.15%. Look for alarms that indicate transducer
problems and resolve any of these issues. This could include
failing transducers, debris buildup on transducers, or incorrectly
entered path lengths in the configuration.
—
If the chords agree, adjust the SSMin or SSMax using the Edit/
Compare Config utility in MeterLink
™
so the meter's average
speed of sound falls within these limits.
—
Collect a Maintenance log using MeterLink and contact your
Emerson Flow service representative.
Maintenance and Troubleshooting Manual
Troubleshooting
00809-0600-3104
April 2022
Rosemount Gas Ultrasonic Flow Meters
25
