Emerson Rosemount 3095, Reference Manual, Page: 117 / 130

Reference Manual
00809-0100-4716, Rev JA
May 2008
5-11
Rosemount 3095 MultiVariable
Reassembling the
Process Sensor Body
1. Inspect the Teflon sensor module O-rings. If the O-rings are
undamaged, they can be re-used. If the O-rings show signs of
damage, such as nicks or cuts, or if there is any doubt about their
sealing ability, replace them with new O-rings. Use the following
steps:
a. Remove the damaged O-rings by carefully prying them from the
O-ring grooves. Take care not to damage the surface of the
isolating diaphragm during this process.
b. Replace the damaged O-rings by fitting new O-rings into the O-ring
grooves.
2. Install the process flange on the sensor module. To hold the process
flange in place, install the two hex head alignment screws. These
screws are not pressure retaining and need only be finger tight. Do
not overtighten; this will affect the module/flange alignment.
3. Install the appropriate flange bolts using Figure 2-9 on page 2-18 as a
reference:
• For installations requiring a
1
/
4
–18 NPT mounting, install the four
1.75-inch process flange bolts. First finger-tighten the bolts. Then
tighten the bolts incrementally in a cross pattern until they are
securely tightened to 650 in-lb (300 in-lb for stainless steel bolts).
After tightening, the bolts should protrude through the top of the
module housing.
• For installations requiring a 1 /
2
–14 NPT mounting, hold the optional
flange adapters and flange adapter O-rings in place while
finger-tightening the four 2.88-inch process flange/adapter bolts.
Tighten the bolts in a cross pattern following the procedure outlined
above. (Use two 2.88- inch bolts and two 1.75-inch bolts for gage
pressure configurations.) After tightening, the bolts should protrude
through the top of the module housing. If the bolts do not extend all
the way through the module housing, you have used a bolt of
incorrect length. Replace the bolt with one of the correct length, and
repeat the procedure.
• For installations with a three-valve manifold, align the process
flange with the three-valve manifold. Install the four 2.25-inch
manifold flange bolts following the procedure outlined above. After
tightening, the bolts should protrude through the top of the module
housing. If the bolts do not extend all the way through the module
housing, you have used a bolt of incorrect length. Replace the bolt
with one of the correct length, and repeat the procedure. Optional
flange adapters can be installed on the process end of the
three-valve manifold using the 1.75-inch flange bolts supplied with
the transmitter.
4. If the Teflon sensor module O-rings have been replaced, the flange
bolts should be re-torqued after installation to compensate for cold
flow.