Draft Range; Environmental - Emerson Rosemount 3051S Series Reference Manual

Reference Manual
00809-0100-4801, Rev FA
October 2010

Draft Range

Environmental

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 Figure 2-3 on
page 2-11, keeping drain/vent connections on the bottom for gas service and
on the top for liquid service.
Installation
For the 3051S_CD0 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 mounting 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 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 Damping on page 3-11.
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.
Another method is to plumb the reference side to a chamber that has a small
vent to atmosphere. If multiple draft transmitters are being used in an
application, the reference side of each device can be plumbed to a chamber
to achieve a common gage reference.
Access requirements and cover installation on page 2-5 can help optimize
transmitter performance. Mount the transmitter to minimize ambient
temperature changes, vibration, mechanical shock, and to avoid external
contact with corrosive materials. Appendix A: Specifications and Reference
Data lists temperature operating limits.
Rosemount 3051S Series
2-3