36
Reference Manual
00809-0100-4107, Rev BA
Section 3: Hardware Installation
April 2013
Figure 3-1. Housing rotation
A. Housing Rotation Set Screw (5/64-in.)
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
. Stainless steel bolts supplied by Emerson Process
Management 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 Process Management are identified by their head markings.
Bolt installation
Only use bolts supplied with the Rosemount 2051 or sold by Emerson Process Management as
spare parts for the Rosemount 2051 transmitter. The use of non approved bolts could reduce
pressure. Use the following bolt installation procedure:
Table 3-1. Bolt installation torque values
Bolt material
Initial torque value
Final torque value
CS-(ASTM-A445) Standard
300 in.-lb (34 N-m)
650 in.-lb (73 N-m)
Austemitic 316 SST—Option L4
150 in.-lb (17 N-m)
300 in.-lb (34 N-m)
ASTM A193 Grade B7M—Option L5
300 in.-lb (34 N-m)
650 in.-lb (73 N-m)
ASTM A 193 Class 2, Grade B8M
option L8
300 in.-lb (34 N-m)
650 in.-lb (73 N-m)
A
