Table 2-1: Troubleshooting
(continued)
Error
Recommended action(s)
Chord failure
Chord is hard failed (Chord A or Chord B) and meter is unable to
obtain measurement data from this pair of transducers.
•
If Chord A (or Chord B) is failed and no other transducers are
failed or are reporting status alerts, the issue is most likely
isolated to this pair of transducers or its cabling. Check the
transducer wiring for this pair of transducers to make sure
connections are secure and wired correctly.
•
Verify that the meter run is not partially full where the top
transducer pair (Chord A) is not submerged in the process
fluid.
•
Verify the average gain of this transducer pair is not above
90dB. The gain value can be read in MeterLink on the
Monitor page.
•
Check the Acquisition Module transducer wiring for this pair
of transducers to make sure connections are secure and
wired correctly.
•
If transducer cabling allows, swap cabling of failed
transducer pair with a pair with equal path lengths (Chord
A1 and B1, Chord A2 and B2) or access the acquisition
module and swap the cabling of the failed transducer pair
with a pair with equal path lengths. If the alarm remains
active for this chord, then the transducers are working
properly. If this alarm clears but the chord that was
swapped now fails, the issue is with the transducer.
•
Collect a Maintenance Log, Configuration file and
Waveform stream file with MeterLink and contact your
Emerson Flow service representative.
CPU Module LINK LED
•
When connecting directly:
—
Use a cross-over cable connection (P/N 2-3-3400-079)
•
When Using a Hub:
—
Use straight-through patch cable between the meter
and the hub and a straight-through patch cable
between the hub and the PC
—
Do not connect either the meter or PC to the hub
UPLINK port
—
Check the CPU Module LED1 is on (either solid red or
flashing green). If the LED is not on, check power to the
meter
—
If the LED is on, check the Ethernet cable connections
Maintenance and Troubleshooting Manual
Troubleshooting
00809-0100-3812
April 2022
Rosemount 3812 Liquid Ultrasonic Flow Meter
17
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