8 Trimming the transmitter
Transmitters are shipped fully calibrated per request or by the factory default
of full scale.
8.1 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.
8.1.1 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 the Field Communicator, see
Figure 4-1).
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:
Flow Fast
Keys
Direct output
Fast Keys
Description
1, 2, 5, 4 1, 2, 4, 4 Static pressure sensor trim options
3. Use the zero trim (selection 1) for a transmitter equipped with a gage
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.
4. Zero the differential pressure sensor by inputting the following Fast
Key sequence at the Rosemount 3051SMV menu:
Flow Fast
Keys
Direct output
Fast Keys
Description
1, 2, 5, 3, 1 1, 2, 4, 3, 1 Differential pressure sensor zero trim
Quick Start Guide October 2018
30 Rosemount 3051SMV
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