46
Reference Manual
00809-0400-4101, Rev BA
Operation and Maintenance
January 2018
Operation and Maintenance
5.3
Recommended calibration tasks
5.3.1
Field installation tasks
1. Perform sensor zero/lower trim: Compensate for mounting pressure effects
Section 3: Rosemount 306 Manifold
for manifold operation instructions to properly
drain/vent valves.
2. Set/check basic configuration parameters:
a. Output units
b. Range points
c. Output type
d. Damping Value
5.3.2
Bench calibration tasks
1. Perform optional 4–20 mA output trim.
2. Perform a sensor trim.
a. Zero/lower trim using line pressure effect correction. Reference
for manifold drain/vent valve operation instructions.
b. Optional full scale trim. Sets the span of the device and requires accurate calibration equipment.
c. Set/check basic configuration parameters.
5.4
Calibration overview
The Pressure Transmitter is an accurate instrument that is fully calibrated in the factory. Field calibration
is provided to the user to meet plant requirements or industry standards. Complete calibration of the
transmitter can be split into two halves: Sensor Calibration and Analog Output Calibration.
Sensor calibration allows the user to adjust the pressure (digital value) reported by the transmitter to be
equal to a pressure standard. The sensor calibration can adjust the pressure offset to correct for
mounting conditions or line pressure effects. This correction is recommended. The calibration of the
pressure range (pressure span or gain correction) requires accurate pressure standards (sources) to
provide a full calibration.
Like the Sensor calibration, the analog output can be calibrated to match the user measurement system.
The Analog Output Trim (4–20 mA) will calibrate the loop at the 4 m and 20 mA points.
The Sensor calibration and the analog output calibration combine to match the transmitter’s
measurement system to the plant standard.
Calibrate the sensor
Sensor trim (
Zero trim (
Absolute pressure transmitters are calibrated at the factory. Trimming adjusts the position of the
factory characterization curve. It is possible to degrade performance of the transmitter if any trim is
done improperly or with inaccurate equipment.
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