Installation Guide
UMSITRPDS3-1
Standard PMC-Style Process Connection
The Model 7MF4133 gage pressure transmitter is available with a PMC-style process connection.
1
See
Figure 9. The provided nipple must be
carefully welded
to the process vessel, the supplied O-ring
inserted, the transmitter measuring cell inserted into the nipple and the locking nut tightened.
PMC-Style Process
Connection (Nipple)
Lock-Ring Nut
Measuring Cell Diaphragm
Gasket
FIGURE 9 Standard PMC-Style Process Connection
IMPORTANT
The transmitter’s measuring cell diaphragm is exposed in this model. Do not
scratch or otherwise mar the cell diaphragm. If damaged, the cell must be
replaced.
IMPORTANT
Installation and welding of a nipple must be done by a trained machinist/welder
using heliarc (inert gas welding process). Careless installation can distort the
nipple resulting in leakage and/or jammed threads.
Nipple Installation
1.
Cut the hole for the nipple to produce a tight fit. An oversize hole will result in distortion of the
nipple. See Figure 10.
2.
Bevel the edge of the outside face of the hole as shown below.
1. Outside Face of Process Vessel
2. Bevel
3. Position Tack Weld
4. Fillet Weld
1
M
A
0
0
6
1
3
a
.080"/2mm
3
4
2
Nipple
FIGURE 10 Nipple Installation
1
Other process connections are available, including a PMC-style minibolt weldable socket version (flush front
construction). Refer to the Siemens Process Automation catalog: Field Instruments for Process Automation.
12
February
2012
