Filter
Top Products
Quick Installation Guide
00825-0100-4593, Rev BA
July 2009
Rosemount 1151
13
STEP 6: TRIM THE TRANSMITTER
NOTE
Transmitters are shipped fully calibrated per request or by the factory default of full scale
(span = upper range limit).
Full Trim
A full trim is a two-point sensor calibration where two end-point pressures are applied, and
the transmitter process variable output is adjusted to agree with the pressure input.
Using the HART Communicator
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
HART Communicator” instructions below. If zero offset is greater than 3% of true zero, follow
the “Using the Transmitter Zero Adjustment Buttons” instructions.
Using the HART Communicator
HART Fast Keys Steps
1, 2, 3, 3 1. Equalize or vent the transmitter and connect HART
communicator.
2. At the menu, input the HART Fast Key sequence.
3. Follow the commands to perform a full trim.
HART Fast Keys Steps
1, 2, 3, 3, 1 1. Equalize or 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.
4593_Rev_BA.fm Page 13 Friday, August 7, 2009 3:38 PM