Process Connections - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0300-4101, Rev BB
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.

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
Flange adapters are available with standard
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 page 74
distance may be varied ±
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
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.
Hardware Installation
/ –14 NPT class 2 connections. The flange
1
2
for the distance between pressure connections. This
/ -in. (3.2 mm) by rotating one or both of the flange adapters.
1
8
"Flange bolts" on page 21
Section 5: Calibration.
Hardware Installation
November 2016
1
for torque specifications.
/ –18 NPT.
4
25