Trim The Transmitter - Emerson Rosemount 3051 Quick Start Manual

Quick Start Guide
7

Trim the transmitter

Note
Transmitters are shipped fully calibrated per request or by the factory
default of full scale (span = upper range limit).
7.1 Zero trim
A zero trim is a single-point adjustment used for compensating mounting
position effects. When performing a zero trim, ensure the equalizing valve is
open and all wet legs are filled to the correct level.
There are two methods to compensate for mounting effects:
• Zero trim using the handheld communicator
• Using the transmitter zero adjustment buttons
7.1.1 Zero trim using the handheld communicator
If zero offset is within 3% of URL, follow the instructions below. This zero trim
will affect the 4–20 mA value, the HART PV, and the display value.
Procedure
1. Equalize or vent the transmitter and connect Field Communicator.
2. At the menu, input the HART Fast Key sequence (refer to
Table
3. Follow the commands to perform a zero trim.
7.1.2 Using the transmitter zero adjustment buttons
Using the transmitter zero adjustment buttons, the lower range value (LRV)
will be set to the pressure applied to the transmitter. This adjustment will
affect the 4–20 mA value only. Perform the following steps to perform a
rerange using the zero adjustment buttons.
Procedure
1. Loosen the certifications label screw and slide the label to expose the
zero adjustment buttons.
2. Set the 4 mA point by pressing the zero button for two seconds.
Verify the output is 4 mA.
The optional LCD display will show ZERO PASS.
22
6-2).
March 2020
Table 6-1
Emerson.com/Rosemount
or