Emerson 3051S Specifications Page 17

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7
Reference Manual
00809-0100-4001, Rev JA
Section 2: Installation
November 2012
Installation
Important
Install the enclosed pipe plug (found in the box) in unused conduit opening with a minimum of
five threads engaged to comply with explosion-proof requirements.
For material compatibility considerations, see document number 00816-0100-3045 on
www.emersonprocess.com/rosemount.
2.4 Mechanical considerations
Note
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.
Note
When the transmitter is mounted on its side, position the Coplanar flange to ensure proper
venting or draining. Mount the flange as shown in Figure 2-8 on page 16, keeping drain/vent
connections on the bottom for gas service and on the top for liquid service.
2.5 Draft range considerations
Installation
For the Rosemount 3051CD0 draft range pressure transmitter, it is best to mount the
transmitter with the isolators parallel to the ground. Installing the transmitter in this way
reduces oil head effect and provides for optimal temperature performance.
Be sure the transmitter is securely mounted. Tilting of the transmitter may cause a zero shift in
the transmitter output.
Reducing process noise
There are two recommended methods of reducing process noise: output damping and, in gage
applications, reference side filtering.
Output damping
The output damping for the Rosemount 3051CD0 is factory set to 3.2 seconds as a default. If
the transmitter output is still noisy, increase the damping time. If faster response is needed,
decrease the damping time. Damping adjustment information is available on page 57.
Reference side filtering
In gage applications it is important to minimize fluctuations in atmospheric pressure to which
the low side isolator is exposed.
One method of reducing fluctuations in atmospheric pressure is to attach a length of tubing to
the reference side of the transmitter to act as a pressure buffer.
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