Emerson Rosemount 2051 Reference Manual page 40

Hardware Installation
September 2020
2. Rotate the housing clockwise to the desired location.
3. If the desired location cannot be achieved due to thread limit, rotate the housing
4. Retighten the housing rotation set screw to no more than 7 in-lbs when desired
Electronics housing clearance
Mount the transmitter so the terminal side is accessible. Clearance of 0.75 in. (19 mm) is
required for cover removal. Use a conduit plug in the unused conduit opening. Three
inches of clearance is required for cover removal if a meter is installed.
Environmental seal for housing
For NEMA 4X, IP66, and IP68 requirements, use thread seal (PTFE) tape or paste on male
threads of conduit to provide a watertight seal.
Always ensure a proper seal by installing the electronics housing cover(s) so that metal
contacts metal. Use Rosemount O-rings.
Flange bolts
The Rosemount 2051 can be shipped with a coplanar flange or a traditional flange
installed with four 1.75-inch flange bolts. Mounting bolts and bolting configurations for
the coplanar and traditional flanges can be found on
supplied by Emerson are coated with a lubricant to ease installation. Carbon steel bolts do
not require lubrication. No additional lubricant should be applied when installing either
type of bolt. Bolts supplied by Emerson are identified by their head markings.
Bolt installation
Only use bolts supplied with the transmitter or sold by Emerson as spare parts. The use of
non approved bolts could reduce pressure. Use the following bolt installation procedure:
Table 3-1: Bolt installation torque values
Bolt material
CS-(ASTM-A445) Standard
Austemitic 316 SST—Option L4
ASTM A193 Grade B7M—Option L5
ASTM A 193 Class 2, Grade B8M option
L8
40
counterclockwise to the desired location (up to 360° from thread limit).
location is reached.
Bolt installation. Stainless steel bolts
Initial torque value
300 in.-lb (34 N-m)
150 in.-lb (17 N-m)
300 in.-lb (34 N-m)
300 in.-lb (34 N-m)
Rosemount 2051 Pressure Transmitter
Reference Manual
00809-0100-4107
Final torque value
650 in.-lb (73 N-m)
300 in.-lb (34 N-m)
650 in.-lb (73 N-m)
650 in.-lb (73 N-m)