Reference Manual
00809-0100-4360, Rev BA
August 2008
5-17
Rosemount 1151
1. Clean the sealing surfaces carefully.
2. Place the module on a flat surface, “H” side up.
3. Place the greased flange O-ring around the isolator and push it into the
cavity.
4. For all HP transmitters and GP transmitters Ranges 9 and 0, place the
backup ring, shiny side down, on top of the O-ring. This places the flat
side of the backup ring against the O-ring.
5. Carefully place the flange on top of the module, beveled side down so
that the beveled flange surface mates with the beveled surface of the
backup ring.
6. Keeping the flange and module together, turn them over so the “L” side is
up. Repeat Steps 3 through 5. As before, the flat side of the backup ring
must rest against the O-ring.
7. Insert the four flange bolts.
8. Tighten the nuts finger tight, making sure the flanges remain parallel. The
transmitter may now be moved without disturbing the O-rings.
a. Tighten one bolt until the flanges seat.
b. Torque down the bolt diagonally across.
c. Torque down the first bolt.
d. Torque down the two remaining bolts.
e. Inspect the flange-to-sensor seating to be sure that the flanges are
not cocked.
f. Check that all four bolts are tightened to approximately 33 ft-lb (39
Nm).
9. Recalibrate the transmitter.
NOTE
If the Rosemount 1151 Range 3 transmitter sensor module serial number is
below 2,900,000, it must be temperature cycled whenever changing or
rebolting flanges.
Process leaks can cause death or serious injury. An incorrectly installed backup ring
can destroy the o-ring and cause process leaks. Install the backup ring using the
following procedure.
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