Section 5: Operation and Maintenance

Reference Manual

May 2013

00809-0100-4102, Rev AA

 

 

 

 

 

 

 

 

 

 

 

 

Absolute pressure transmitters (2051CA and 2051TA) 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.

Table 5-1. Recommended Calibration Tasks

Transmitter

Bench Calibration Tasks

Field Calibration Tasks

 

 

 

 

 

2051CD

1.

Set output configuration parameters:

1.

Reconfigure parameters if

2051CG

a.

Set the range points.

 

necessary.

2051L

 

 

2051TG, Range

b.

Set the output units.

2.

Zero trim the transmitter to

1-4

 

c.

Set the output type.

 

compensate for mounting effects

 

 

 

 

or static pressure effects.

 

2.

Optional: Perform a sensor trim.

 

 

 

 

(Accurate pressure source required.)

 

 

2051CA

1.

Set output configuration parameters:

1.

Reconfigure parameters if

2051TA

a.

Set the range points.

 

necessary.

2051TG, Range 5

 

 

 

b.

Set the output units.

2.

Perform low trim value section of

 

c.

Set the output type.

 

the sensor trim procedure to

 

 

 

 

correct for mounting position

 

2.

Optional: Perform a sensor trim if

 

effects.

 

 

equipment available (accurate

 

 

 

 

absolute pressure source required),

 

 

 

 

otherwise perform the low trim value

 

 

 

 

section of the sensor trim procedure.

 

 

 

 

 

 

 

Note:

For 2051CA, 2051TA range 0 and range 5 devices, an accurate absolute pressure source is required.

5.3.1Determining 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 operating points. Exercising the Transmitter over the desired pressure range allows for verification of the output value. “Sensor Trim” on page 68 discusses how the trim operations change the calibration. It is possible to degrade the performance of the transmitter if a trim is done improperly or with inaccurate equipment. The transmitter can be set back to factory settings using the Recall Factory Trim command in “Recall Factory Trim—Sensor Trim” on page 70.

64

Operation and maintenance

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Emerson 00809-0100-4102 manual Determining necessary Sensor Trims, Operation and Maintenance Reference Manual