Emerson Rosemount 2051 Reference Manual page 48

Hardware Installation
September 2020
3.4.3 Process connections
Coplanar or traditional process connection
Install and tighten all four flange bolts before applying pressure, or process leakage will
result. When properly installed, the flange bolts will protrude through the top of the
sensor module housing. Do not attempt to loosen or remove the flange bolts while the
transmitter is in service.
Flange adapters
Rosemount 2051DP and GP process connections on the transmitter flanges are ¼–18
NPT. Flange adapters are available with standard ½–14 NPT Class 2 connections. The
flange adapters allow users to disconnect from the process by removing the flange
adapter bolts. Use plant-approved lubricant or sealant when making the process
connections. Refer to dimensional drawings on
pressure connections. This distance may be varied ±¼in. (6.4 mm) by rotating one or both
of the flange adapters.
To install adapters to a Coplanar flange, perform the following procedure:
Procedure
1. Remove the flange bolts.
2. Leaving the flange in place, move the adapters into position with the o-ring
3. Clamp the adapters and the cCoplanar flange to the transmitter sensor module
4. Tighten the bolts. Refer to
Example
When removing 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
Note
PTFE O-rings should be replaced if the flange adapter is removed.
3.4.4 Inline process connection
Inline gauge transmitter orientation
CAUTION
Interfering or blocking the atmospheric reference port will cause the transmitter to output
erroneous pressure values.
48
installed.
using the larger of the bolts supplied.
Section 5:
page 113
"Flange bolts" on page 36
Troubleshooting.
Reference Manual
00809-0100-4107
for the distance between
for torque specifications.
Rosemount 2051 Pressure Transmitter