Emerson Rosemount 3410 Series Maintenance And Troubleshooting Manual page 17

Maintenance and Troubleshooting manual
00809-0200-3104
Rosemount 3415, 3416 and 3417
c. With the ohm meter, try measuring the resistance across the two pins
on the back of the transducer capsule.
If the value is not 1 Mohm ± 0.2 Mohm, then replace the transducers.
d. Measure the resistance across the two pins on the transformer
module that connect to the electronics through the transducer cables.
If the value is over 2 ohms, replace the transformer module.
e. Measure the resistance across the two pins on the transformer
module that lead to the electronics.
If the value is over 2 ohms, replace the transformer module.
f. Measure the resistance across the two pins on the transformer
module that connect to the transducer holder.
If the value is not between 30 and 40 ohms for the T-21 and T-41
transformer module, replace the transformer module.
If the value is not between 50 and 75 ohms for the T-22 transformer
module, replace the transformer module.
If the value is not between 7 and 12 ohms for the T-32 transformer
module, replace the transformer module.
g. If possible, measure the capacitance of the transducer capsule with
an LCR meter by measuring across the two pins on the back of the
capsule.
If the value is not between 450 and 600 pF for the T-21 and T-41
transducer, replace the transducer.
If the value is not between 215 and 350 pF for the T-22 transducer,
replace the transducer.
If the value is not between 400 and 550 pF for the T-32 transducer,
replace the transducer.
• For T-200 transducers:
a. Remove the transducer cables from the transducers.
b. Measure the resistance with an ohm meter across the two pins on the
back of the transducer capsules.
If the values are over 2 ohms, replace the transducer capsules.
If the values are under 2 ohms, remove the transducer capsules, clean
and reapply the coupling fluid to the front face of the transducer
capsules, and reinstall the transducer capsules.
If this does not correct the issue, remove the transducer assembly
from the meter and verify there is no debris or liquid build-up on the
transducer housing face causing the chord failure.
Consult Emerson Flow support if this does not address the issue.
3. If transducer cabling allows, swap cabling of failed transducer pair with a pair of
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.
4. Collect a Maintenance log, Configuration file, and Waveform stream file with
MeterLink and contact your Emerson Flow service representative.
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Troubleshooting
December 2023
17