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17
Reference Manual
00809-0100-4001, Rev JA
Section 2: Installation
November 2012
Installation
Whenever you remove flanges or adapters, visually inspect the PTFE o-rings. Replace with o-ring
designed for Rosemount transmitter if there are any signs of damage, such as nicks or cuts.
Undamaged o-rings may be reused. If you replace the o-rings, retorque the flange bolts after
installation to compensate for cold flow. Refer to the process sensor body reassembly procedure
in Section 5: Troubleshooting.
O-rings:
The two styles of Rosemount flange adapters (Rosemount 1151 and Rosemount
3051S/3051/2051/3095) each require a unique O-ring (see Figure 2-9). Use only the O-ring
designed for the corresponding flange adaptor.
Figure 2-9. O-Rings.
When compressed, PTFE O-rings tend to “cold flow,” which aids in their sealing capabilities.
Note
PTFE O-rings should be replaced if the flange adapter is removed.
Failure to install proper flange adapter O-rings may cause process leaks, which can result in death or
serious injury. The two flange adapters are distinguished by unique O-ring grooves. Only use the
O-ring that is designed for its specific flange adapter, as shown below.
Rosemount 3051S / 3051 / 2051 / 3095
Rosemount 1151
Flange Adapter
O-ring
Flange Adapter
O-ring
PTFE Based
Elastomer
PTFE
Elastomer
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