Emerson 3051 - Step 6: Trim the Transmitter; Zero Trim

Quick Installation Guide
00825-0100-4001, Rev BA
November 2002
Model 3051
STEP 6: TRIM THE TRANSMITTER
NOTE
Transmitters are shipped from Rosemount Inc. fully calibrated per
request or at the factory default of full scale.
Zero Trim
A zero trim is a single-point adjustment used for compensating
mounting position effects. When performing a zero trim, ensure that
the equalizing valve is open and all wet legs are filled to the correct
level.
If zero offset is less than 3% of true zero, follow the “Using the Model
275 HART Communicator” instructions below. If zero offset is greater
than 3% of true zero, follow the “Using the Transmitter Zero
Adjustment Button” instructions below to rerange.
Using the Model 275 HART Communicator
Using the Transmitter Zero Adjustment Button
Fast Keys Steps
1, 2, 3, 3, 1 1. Vent the transmitter and connect HART communicator.
2. At the menu, input the HART Fast Key sequence.
3. Follow the commands to perform a zero trim.
1. Loosen the certifications label screw and
rotate the label to expose the zero
adjustment buttons.
2. Set the 4 mA point by pressing the zero
button for 2 seconds. Verify that the output
is 4 mA. A meter will display ZERO PASS.
Zero Adjustment Button
4001_RevBA.fm Page 10 Monday, November 25, 2002 2:27 PM