Emerson Rosemount 3051CF Series Reference Manual page 67

Reference Manual
00809-0100-4774
Figure 3-10: Installation Examples
Liquid service
B
A. Drain/vent valves
B. Flow
Best practices
The piping between the process and the transmitter must accurately transfer the pressure
to obtain accurate measurements. There are five 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, and density variations between the legs.
The best location for the transmitter in relation to the process pipe is dependent on the
process. Use the following guidelines to determine transmitter location and placement of
impulse piping:
• Keep impulse piping as short as possible.
• For liquid service, slope the impulse piping at least 1-in./ft. (8 cm/m) upward from the
transmitter toward the process connection.
• For gas service, slope the impulse piping at least 1-in./ft. (8 cm/m) downward from the
transmitter toward the process connection.
• Avoid high points in liquid lines and low points in gas lines.
• Make sure both impulse legs are the same temperature.
Reference Manual
Gas service
A
A
B
Hardware installation
Steam service
B
July 2020
A
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