Emerson Rosemount 2051 Quick Start Manual page 7

September 2016
Table 2. Torque Values for the Flange and Flange Adapter Bolts
Bolt material
Carbon Steel (CS)
Stainless Steel (SST)
2.5 O-rings with flange adapters
Failure to install proper flange adapter O-rings may cause process leaks, which can result in death or
serious injury. The two flange adapters are distinguished by unique O-ring grooves. Only use the O-ring
that is designed for its specific flange adapter, as shown below:
O-ring location
A. Flange adapter
B. O-ring
C. PTFE based (profile is square)
D. Elastomer (profile is round)
Whenever the flanges or adapters are removed, visually inspect the O-rings. Replace them if there are
any signs of damage, such as nicks or cuts. If you replace the O-rings, re-torque the flange bolts and
alignment screws after installation to compensate for seating of the PTFE O-ring.
2.6 Environmental seal for housing
Thread sealing (PTFE) tape or paste on male threads of conduit is required to
provide a water/dust tight conduit seal and meets requirements of NEMA
Type 4X, IP66, and IP68. Consult factory if other Ingress Protection ratings are
required.
For M20 threads, install conduit plugs to full thread engagement or until
mechanical resistance is met.
2.7 In-line gage transmitter orientation
The low side pressure port (atmospheric reference) on the in-line gage
transmitter is located in the neck of the transmitter, behind the housing.
The vent path is 360° around the transmitter between the housing and sensor.
(See Figure 4.)
Head markings
316
316
R
Rosemount 3051S/3051/2051
B7M
B8M
316
STM SW
316 316
A
B
C
D
Quick Start Guide
Initial torque Final torque
300 in-lb 650 in-lb
150 in-lb 300 in-lb
®
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