Emerson 00809-0100-4102 manual Reducing process noise, Output damping, Reference side filtering

Section 3: Installation	Reference Manual
May 2013	00809-0100-4102, Rev AA

Tilting of the transmitter may cause a zero shift in the transmitter output, but can be eliminated by performing a trim procedure.

Figure 3-3. Draft range installation example

A

A. Isolators

Reducing process noise

Rosemount 2051CD0 draft transmitters are sensitive to small pressure changes. Increasing the damping will decrease output noise, but will further reduce response time. In gage applications, it is important to minimize pressure fluctuations to the low side isolator.

Output damping

The Damping command introduces a delay in processing which increases the response time of the transmitter; smoothing variations in output readings caused by rapid input changes. In the Rosemount 2051 Wireless pressure transmitter, damping only takes effect when the device is placed in high power refresh mode and during calibration. In normal power mode, the effective damping is 0. Note that when the device is in high power refresh mode, battery power will be depleted rapidly. Determine the appropriate damp setting based on the necessary response time, signal stability, and other requirements of the loop dynamics of your system. The damping value of your device is user selectable from 0 to 60 seconds.

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.

34 Installation