Determining Calibration Frequency - Emerson Rosemount 3051 Reference Manual

Pressure transmitter with profibus pa protocol

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Reference manual (222 pages)

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Table Of Contents

Table of Contents

Calibration

April 2020

Note

Do not perform a zero trim on absolute pressure transmitters. Zero trim is zero based, and

absolute pressure transmitters reference absolute zero. To correct mounting position

effects on absolute pressure transmitters, perform a lower trim within the sensor trim

function. The lower trim function provides an offset correction similar to the zero trim

function, but it does not require zero-based input.

5.3.2

Sensor trim

A two-point sensor calibration where two end-point pressures are applied, and all output is

linearized between them. Always adjust the lower trim value first to establish the correct

offset. Adjustment of the upper trim value provides a slope correction to the characteriza-

tion curve based on the lower trim value. The trim values allow you to optimize

performance over your specified measuring range at the calibration temperature. Sensor

trimming requires an accurate pressure input – at least four times more accurate than the

transmitter – in order to optimize performance over a specific pressure range.

Note

The Rosemount 3051 has been carefully 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.

Note

Rosemount 3051C Range 4 and Range 5 Transmitters require a special calibration

procedure when used in differential pressure applications under high static line pressure.

See

Compensating for line pressure

5.3.3

Recall factory trim

A command that allows the restoration of the as-shipped factory settings of the sensor

trim. This command can be useful for recovering from an inadvertent zero trim of an

absolute pressure unit or inaccurate pressure source.

5.4