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Reference Manual
00809-0200-4101, Rev AA
July 2008
2-17
Rosemount 2051
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 Adaptors:
Rosemount 2051DP and GP process connections on the transmitter flanges
are
1
/4–18 NPT. Flange adapters are available with standard
1
/2–14 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 page 2-3 for the distance between pressure connections. This
distance may be varied ±
1
/8 in. (3.2 mm) by rotating one or 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 “Flange Bolts” on page 2-13 for torque
specifications.
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
Section 5: Troubleshooting.