Emerson Rosemount MultiVariable 3051SMV, Reference Manual

Page: 26 / 112

18
Reference Manual
00809-0100-4853, Rev AB
Installation
January 2017
Installation
3.3 Considerations
3.3.1 General
Measurement performance depends upon proper installation of the transmitter and impulse piping.
Mount the transmitter close to the process and use minimum piping to achieve best performance. Also,
consider the need for easy access, personnel safety, practical field calibration, and a suitable transmitter
environment. Install the transmitter to minimize vibration, shock, and temperature fluctuation.
Important
Install the enclosed pipe conduit plug (found in the box) in the unused conduit plug opening. For straight
threads, a minimum of seven threads must be engaged. For tapered threads, a minimum of five threads
must be engaged; install the plug wrench-tight.
For material compatibility considerations, see the Material Selection Technical Note .
3.3.2 Mechanical
Steam service
For steam service or for applications with process temperatures greater than the limits of the
transmitter, do not blow down impulse piping through the transmitter. Flush lines with the blocking
valves closed and refill lines with water before resuming measurement.
Side mounting
When the transmitter is mounted on its side, position the coplanar flange to ensure proper venting or
draining. Mount the flange as shown in “Mount the transmitter” on page 19 , keeping drain/vent
connections on the bottom for gas service and on the top for liquid service.
Use only bolts supplied or sold by Emerson
™
as spare parts.

Replacement equipment or spare parts not approved by Emerson for use as spare parts could reduce
the pressure retaining capabilities of the transmitter and may render the instrument dangerous.
Improper assembly of manifolds to traditional flange can damage sensor module.

For safe assembly of manifold to traditional flange, bolts must break back plane of flange web (i.e.
bolt hole) but must not contact module housing.
Sensor module and electronics housing must have equivalent approval labeling in order to
maintain hazardous location approvals.

When upgrading, verify sensor module and electronics housing certifications are equivalent.
Differences in temperature class ratings may exist, in which case the complete assembly takes the
lowest of the individual component temperature classes (for example, a T4/T5 rated electronics
housing assembled to a T4 rated sensor module is a T4 rated transmitter.)