Process Connections And Interfaces - Emerson Rosemount 2151N Reference Manual

Rosemount 2151N
Process Connections and
Interfaces
5
Mount the Rosemount 2151N transmitter to a rigid support
(i.e. one with a fundamental mechanical resonant frequency of
40 Hz or greater). A stainless steel bracket is available for the
coplanar flange, and a painted carbon steel bracket is
available for the traditional flange.
Refer to Figure 2-4 for typical mounting configurations for
both the coplanar and traditional flange options.
For maximum accuracy, zero the transmitter after installation
to cancel any zero shift that may occur due to liquid head
effect caused by mounting position.
NOTE
The transmitter is calibrated in an upright position at the
factory. Mounting the transmitter in another position may
cause the zero point to shift by an amount equivalent to the
internal liquid head within the sensor module induced by the
varied mounting position. For maximum accuracy, zero the
transmitter to cancel this effect per Section 3: Calibration.
Mount the process flanges with sufficient clearance for
process connections. For safety reasons, place the drain/vent
valves so the process fluid is directed away from possible
human contact when the vents are used. Also, consider that
access to the vent/drain valve(s) and process connection(s)
may be required for plant specific operations (i.e. calibration,
draining, etc.).
Process tubing must be installed to prevent any added
mechanical stress on the transmitter. Use stress-relief loops
in the process tubing or separately support the process tubing
close to the transmitter.
Connections on the transmitter flange are 1/4-18 NPT. Use
your plant-approved thread sealant when making threaded
connections.
If drain/vent valves are opened to bleed process lines, torque
drain/vent valve stems to the value in Table 5-2 in Section 5:
Maintenance and Troubleshooting when closing.
Reference Manual
00809-0000-4851 Rev AD
December 2023
Installation