Emerson Rosemount 2051 Reference Manual page 47

Reference Manual
00809-0100-4107
Note
For steam or other elevated temperature services, it is important that temperatures at the
process connection do not exceed the transmitter's process temperature limits. See
Temperature limits
Figure 3-8: Installation Examples
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.
• Use impulse piping large enough to avoid friction effects and blockage.
• Vent all gas from liquid piping legs.
• When purging, make the purge connection close to the process taps and purge
through equal lengths of the same size pipe. Avoid purging through the transmitter.
• Keep corrosive or hot [above 250 °F (121 °C)] process material out of direct contact
with the sensor module and flanges.
• Prevent sediment deposits in the impulse piping.
• Avoid conditions that might allow process fluid to freeze within the process flange.
Reference Manual
for details.
Hardware Installation
September 2020
47