Process Connections - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0100-4107, Rev CA
Prevent sediment deposits in the impulse piping.

Maintain equal leg of head pressure on both legs of the impulse piping.

Avoid conditions that might allow process fluid to freeze within the process flange.

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
adapters are available with standard
disconnect from the process by removing the flange adapter bolts. Use plant-approved lubricant or
sealant when making the process connections. Refer to
distance between pressure connections. This distance may be varied ±
both of the flange adapters.
To install adapters to a coplanar flange, perform the following procedure:
1. Remove the flange bolts.
2. Leaving the flange in place, move the adapters into position with the O-ring installed.
3. Clamp the adapters and the coplanar flange to the transmitter sensor module using the larger of the
bolts supplied.
4. Tighten the bolts. Refer to
Whenever you remove 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
shooting.
When compressed, PTFE O-rings tend to "cold flow," which aids in their sealing capabilities.
Note
PTFE O-rings should be replaced if the flange adapter is removed.
Installation
/ —14 NPT Class 2 connections. The flange adapters allow users to
1
2
"Flange bolts" on page 33
1
"Dimensional drawings" on page 102
/ -in. (3.2 mm) by rotating one or
1
8
for torque specifications.
Installation
July 2017
/ —18 NPT. Flange
4
for the
Section 6: Trouble-
37