Reference Manual
00809-0100-4801, Rev FA
October 2010
Rosemount 3051S Series
5-6
Reassemble the Process
Flange
1. Inspect the SuperModule PTFE O-rings. If the O-rings are undamaged,
reusing them is recommended. If the O-rings are damaged (if they have
nicks or cuts, for example), replace them with new O-rings.
NOTE
If replacing the O-rings, be careful not to scratch or deface the O-ring grooves
or the surface of the isolating diaphragm when removing the damaged
O-rings.
2. Install the process flange on the SuperModule. To hold the process
flange in place, install the two alignment screws to finger tight (screws
are not pressure retaining). Do not overtighten; this will affect
module-to-flange alignment.
3. Install the appropriate flange bolts.
a. If the installation requires a
1
/4–18 NPT connection(s), use four
1.75-in. flange bolts. Go to step d.
b. If the installation requires a
1
/2–14 NPT connection(s), use four
2.88-in. process flange/adapter bolts. For gage pressure
configurations, use two 2.88-in. bolts and two 1.75-in. bolts. Go to
step c.
c. Hold the flange adapters and adapter O-rings in place while
finger-tightening the bolts. Go to step e.
d. Finger tighten the bolts.
e. Tighten the bolts to the initial torque value using a crossed pattern.
See Table 5-2 on page 5-7 for appropriate torque values.
f. Tighten the bolts to the final torque value using a crossed pattern.
See Table 5-2 for appropriate torque values. When fully tightened,
the bolts should extend through the top of the module housing.
g. If the installation uses a conventional manifold, then install flange
adapters on the process end of the manifold using the 1.75-in.
flange bolts supplied with the transmitter.
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