6. Apply a small amount of nickel anti-seize (N.A.S.) compound (P/N 2-9-9960-134) to
the outer threads of the transducer holder (see Figure 3-6).
7. Carefully install the transducer holder assembly into the transducer mount. Make
sure the threads of the holder and mount are correctly aligned. Use a 1 1/4” socket
and screw the transducer assembly into the mount. Tighten to securely seat the
assembly in the mount. Do not over tighten (see Figure 3-7).
8. If replacing T-21 or T-22 transducers, install the keyed transformer assembly into
the transducer holder (see Figure 3-7).
a) Apply a small amount of Molykote 111 to the transformer assembly O-ring.
b) Insert the keyed transformer into the back end of the transducer holder.
Figure 3-7: T-22 transducer assembly, holder, transformer assembly, retainer,
cable nut and chordset
A. T-21 transformer assy. (W-01 P/N 1-360-03-090) or T-22 transformer assy. (W-02
P/N 1-360-03-110)
B. Transducer holder (Type - H1 P/N 1-360-01-128, H2 P/N 1-360-01-228)
C. Mount (Inconel mount and holder)
D. Transducer port (meter body)
E. Transducer retainer (Standard P/N 1-360-01-958) (High temperature P/N
1-360-01-978)
F. Cable nut and chordset:
• 100° C -5’ length (P/N 3-3400-190)
• 100° C -15’ length (P/N 3-3400-194)
9. For T-21 and T-22 transducers, Place the retainer over the transformer assembly,
ensure the retainer threads are aligned correctly and hand-tighten. Use a 1 1/8”
Meter repairs Maintenance and Troubleshooting manual
June 2019 P/N 3-9000-769
62 Gas Ultrasonic Flow Meters
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