Figure 19 - Dp Transmitter Head Disassembly - Honeywell ST 700 User Manual

1. Close all valves to isolate the Transmitter from the process.
2. Open the vent in the process head to drain fluid from the Transmitter meter body, as
necessary.
3. Remove the Transmitter from the process.
4. Loosen the nuts in the sequence shown in Figure 20.
5. Remove the nuts from the bolts that hold the process head(s) to the meter body.
6. Remove the process heads and bolts.
7. Remove the gasket/ O-ring, and clean the interior of the process head using a soft bristle
brush and an approved solvent.
8. Inspect the barrier diaphragm for signs of deterioration, corrosion, and distortion.
9. If the diaphragm is distorted contact Honeywell for assistance.
10. Install a new gasket/O-ring in each process head.
11. Coat threads on the process head bolts with a suitable anti-seize compound, such as
"Neverseize," or equivalent.
12. Using a torque wrench, gradually tighten the nuts in the sequence shown in Figure 20.
Tighten head bolts in stages of 1/3-full torque, 2/3-full torque, and full torque. See Table 13
for torque requirements versus Transmitter type and model.
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Figure 19 – DP Transmitter Head Disassembly
ST 700 SmartLine Pressure Transmitters User's Manual Revision 1.0