12. Check that the Rosemount 3410 Series Ultrasonic Gas Flow Meter is pressure tight.
Pressurize the meter to line pressure. Check for leaks around all mounts and
transducer holders, which were removed, using soapy water or other recognized
leak detector. If leaks are found, the meter must be vented to atmosphere and the
problem corrected. Check for leaks again. Continue the process until there are no
leaks.
13. Continue with
Modifying the calibration parameters for T-Slot transducers
the MeterLink
™
Transducer Swap-out Wizard.
3.2.4
Replace the transformers for T-Slot transducers
If your meter is equipped with T-21 or T-22 transducers and you need to replace the
transformers, use the following procedure. Refer to
.
Procedure
1. Disconnect the transducer chordset from the transducer retainer by turning the
cable nut counter-clock wise.
Note
Do not twist the chordset as you disconnect it from the transformer.
2. Unscrew the transformer retainer from the holder using a 1
⅛
” wrench.
3. Pull the transformer assembly from the transducer holder assembly.
4. Apply a small amount of Molykote 111 to the O-rings on the replacement
transformer assembly.
5. Plug the replacement transformer assembly into the transducer holder assembly.
The transformer is keyed and can only be installed one way.
Note
T-21 transducers use W-01 transformers and T-22 transducers use W-02
transformers.
6. Place the retainer over the transformer assembly. Ensure the retainer threads are
aligned correctly and hand-tighten. Use a 1
⅛
” wrench and turn clockwise until the
transformer retainer is fully seated in the transducer holder.
Note
Do not over tighten the retainer.
7. Plug the keyed chordset into the transformer assembly.
3.2.5
Modifying the calibration parameters for T-Slot
transducers
When transducer pairs, mounts, stalks or transducer holders are replaced, the
corresponding meter calibration parameters must be updated for accurate operation. This
means modifying the affected chord "L" dimension
(LA... LD
) (see Determining the “L”
Value below), average delay time (
AvgDlyA... AvgDlyD
) and delta delay time (
DltDlyA...
Maintenance and Troubleshooting Manual
Meter repairs
00809-0600-3104
April 2022
Rosemount Gas Ultrasonic Flow Meters
51
