Figure 3-9: O-rings
WARNING
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.
A. Flange adapter
B. O-ring
C. PFTE based
D. Elastomer
WARNING
When compressed, PTFE O-rings tend to cold flow, which aids in their sealing capabilities.
Note
You should replace PTFE O-rings if you remove the flange adapter.
Impulse piping considerations
The piping between the process and the transmitter must accurately transfer the pressure
to obtain accurate measurements. There are many possible sources of error: pressure
transfer, leaks, friction loss (particularly if purging is used), trapped gas in a liquid line,
liquid in a gas line, density variations between the legs, and plugged impulse piping.
The best location for the transmitter in relation to the process pipe depends on the
process itself. Use the following guidelines to determine transmitter location and
placement of impulse piping:
• Keep impulse piping as short as possible.
Reference Manual
Installation
00809-0100-4803 October 2018
Emerson.com/Rosemount 83
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