Zero Trim; Sensor Trim - Emerson Rosemount 3051S Series Reference Manual

Reference Manual
00809-0100-4801, Rev HA
Note
Do not perform a zero trim on Rosemount 3051S Absolute Pressure Transmitters. Zero trim is zero
based, and absolute pressure transmitters reference absolute zero. To correct mounting position effects
on an absolute pressure transmitter, perform a low trim within the sensor trim function. The low trim
function provides an offset correction similar to the zero trim function, but it does not require
zero-based input.
Sensor trim is a 2-point sensor calibration where two end-point pressures are applied, and all output is
linearized between them. Always adjust the low trim value first to establish the correct offset.
Adjustment of the high trim value provides a slope correction to the characterization curve based on the
low trim value. The trim values allow you to optimize performance over your specified measuring range
at the calibration temperature.
4.2.5

Zero trim

Device Dashboard Fast Keys
HART 5 with Diagnostics Fast Keys
HART 7 Fast Keys
Note
The transmitter must be within three percent of true zero (zero-based) in order to calibrate with zero
trim function.
Field Communicator
Calibrate the sensor with a Field Communicator using the zero trim function as follows:
1. Vent the transmitter and attach a Field Communicator to the measurement loop.
2. From the HOME screen, follow the Fast Key sequence Zero Trim.
3. Follow the commands provided by the Field Communicator to complete the zero trim adjustment.
AMS Device Manager
1. Right click on the device and select Methods, then Calibrate, then Zero trim from the menu
2. Follow the on-screen prompts.
3. Select Finish to acknowledge the method is complete.
4.2.6

Sensor trim

Device Dashboard Fast Keys
HART 5 with Diagnostics Fast Keys
HART 7 Fast Keys
Note
Use a pressure input source that is at least four times more accurate than the transmitter, and allow the
input pressure to stabilize for ten seconds before entering any values.
Operation and Maintenance
Operation and Maintenance
3, 4, 1, 3
3, 4, 1, 1, 1, 3
3, 4, 1, 1, 1, 3
3, 4, 1
3, 4, 1, 1, 1
3, 4, 1, 1, 1
October 2018
.
77