Calibration Overview - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0100-4107
2. Perform a sensor trim.
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 tasks:
1. Sensor calibration
2. Analog output calibration
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/ 1–5 V output trim) will
calibrate the loop at the 4 mA (1 V) and 20 mA (5 V) points.
The Sensor calibration and the analog output calibration combine to match the
transmitter's measurement system to the plant standard.
5.4.1 Calibrate the sensor
• Sensor trim:
• Zero trim:
5.4.2 Calibrate the 4–20 mA output
• 4–20 mA/1–5V Output trim
output
• 4–20 mA/1–5V Output trim using other scale
mA/1–5 V output trim) using other
5.4.3 Determining necessary sensor trims
Bench calibrations allow for calibrating the instrument for its desired range of operation.
Straight forward connections to pressure source allow for a full calibration at the planned
Reference Manual
a) Zero/lower trim Troubleshooting tables
Refer to Install Rosemount 306 integral manifold
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.
(Perform a sensor trim
(Performing a digital zero trim (option
(Performing digital-to-analog trim (4–20 mA/1–5 V
trim))
Operation and Maintenance
using line pressure effect correction.
for manifold drain/vent
)
DZ))
(Performing digital-to-analog trim (4–20
scale)
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