Trimming The Transmitter - Emerson Rosemount 3051S Series Quick Start Manual

Quick Start Guide
9

Trimming the transmitter

Transmitters are shipped fully calibrated per request or by the
factory default of full scale.
9.1 Zero trim
A zero trim is a single-point adjustment used for compensating
mounting position and line pressure effects on static and differential
pressure sensors. When performing a zero trim, ensure that the
equalizing valve is open and all wet legs are filled to the correct level.
The transmitter will only allow up to five percent of URL zero error to
be trimmed.
9.1.1 Perform a zero trim using the Field Communicator
Procedure
1. Equalize or vent the transmitter and connect the Field
Communicator. For more information on connecting, see
Figure
2. If the device is equipped with a static pressure sensor, zero
the sensor by inputting the following Fast Key sequence at the
Rosemount 3051SMV menu:
3. Use the zero trim (selection 1) for a transmitter equipped with
a gauge static pressure sensor or lower sensor trim (selection
2) for a transmitted equipped with an absolute static pressure
sensor.
Note
When performing a lower sensor trim on an absolute pressure
sensor, it is possible to degrade the performance of the sensor
if inaccurate calibration equipment is used. Use a barometer
that is at least three times as accurate as the absolute sensor
of the transmitter.
36
5-1.
Flow Fast Direct output
Keys Fast Keys
1, 2, 5, 4 1, 2, 4, 4
Description
Static pressure sensor trim options
Emerson.com/Rosemount
January 2024