Reference Manual
00809-0100-4360, Rev BA
August 2008
5-7
Rosemount 1151
Reassembly Procedure Follow these procedures carefully to ensure proper reassembly.
Preliminary Precaution
Inspect all O-rings and replace if necessary. Lightly grease with silicone oil to
ensure a good seal. Use halocarbon grease for inert fill options.
Connecting the Electrical Housing to the Sensor
1. Insert the header assembly board through the electronics housing.
2. Use a sealing compound (Loctite
®
222—Small Screw Threadlocker) on
the threads of the sensor module to ensure a watertight seal on the
housing.
3. Screw the sensor module into the electrical housing making sure that at
least five threads are engaged. Be careful not to damage or twist the
sensor leads.
4. Align the sensor module with the high and low pressure sides oriented
for convenient installation.
5. Tighten the lock nut.
Electrical Housing
The smart electronics and header board can easily be installed in the
electrical housing. Steps 10 through 15 in Section 6 Retrofitting the
Rosemount 1151 Transmitter describe this assembly.
Process Sensor Body
All HP transmitters and GP Range 9 and 10 transmitters require metal backup
rings to ensure O-ring integrity. Figure 5-2 illustrates the position and
orientation of the metal backup rings. (Backup rings are not required on AP or
DP transmitters or GP Range 3-8 transmitters.)
NOTE
Handle the backup ring carefully, as it is fragile. Examine the ring carefully.
One side is beveled, while the other side is flat. The flat side appears more
shiny when viewed from above.
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.
An already characterized transmitter requires recharacterization whenever the sensor
module or smart electronics are replaced. Failure to recharacterize can inhibit
transmitter performance. (See Appendix 6: Retrofitting the Rosemount 1151
Transmitter.)
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