Emerson Rosemount 2051G, Справочное руководство

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29
Reference Manual
00809-0100-4108, Rev BA
Hardware Installation
January 2018
Hardware Installation
3.3.2 Environmental considerations
Best practice is to mount the transmitter in an environment that has minimal ambient temperature
change. The transmitter electronics temperature operating limits are –40 to 185 °F (–40 to 85 °C). Refer
to
Appendix A: Reference Data that lists the sensing element operating limits. Mount the transmitter so
that it is not susceptible to vibration and mechanical shock and does not have external contact with
corrosive materials.
3.3.3 Mechanical considerations
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. Refer to
Figure 3-3 on page 31
through Figure 3-5 on page 32 for correct mounting orientation.
3.4 Installation procedures
3.4.1 Mount the transmitter
The approximate weight of the transmitter is 2.44 lb (1,11 kg).
In many cases its compact size and light weight makes it possible to mount directly to the respective
apparatus without using an additional mounting bracket. When this is not desirable, mount directly to a
wall, panel, or two-inch pipe using the optional mounting bracket (see
Figure 3-1 on page 30 ).
For dimensional drawing information refer to Appendix A: Reference Data on page 69 .
Note
Most transmitters are calibrated in the upright position. Mounting the transmitter in any other position
will shift the zero point to the equivalent amount of liquid head pressure caused by the varied mounting
position. To reset zero point, refer to
“Sensor trim overview” on page 48 .
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
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.
Mounting brackets
Rosemount 2051G Transmitters may be panel-mounted or pipe-mounted via an optional mounting
bracket (option code B4). See
Figure 3-1 and for dimensional and mounting configuration information.