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6/08 ST 3000 Release 300 and SFC Model STS103 User’s Manual 179
9.5 Replacing Meter Body, Continued
Procedure, continued
Table 56 Replacing Meter Body Only, continued
Step Action
5
Remove O-ring and clean interior of process head using soft bristle
brush and suitable solvent.
6
Replace O-ring.
ATTENTION
The process head for a GP or an AP transmitter with
single-head design has two O-ring grooves. A large one which is 2 in
(50.8 mm) in diameter and a small one which is 1.3 in (33 mm) in
diameter as shown in the following illustration. On high-pressure,
model STG180, GP transmitters, be sure to use a small O-ring in the
smaller/inner groove. On other models of GP and AP transmitters,
use a large O-ring in the larger/outer groove.
Never use both O-rings
together.
Larger O-ring
groove for
lower pressure
applications
Smaller O-ring
groove for
high pressure
applications
22518
GP/AP Process Head
• For process heads of a GP or AP transmitter with dual-head
design, see detail illustration for differential pressure transmitters
in Step 8.
7
Coat threads on process head bolts with anti-seize compound such
as “Neverseize” or equivalent.
Continued on next page