Emerson 3051N Manuel d'utilisateur télécharger pdf (Page 27)

Reference Manual

00809-0100-4808, Rev CA

June 2008

2-15

Rosemount 3051N

Calibration Overview Complete calibration of the Rosemount 3051N Pressure Transmitter involves

the following tasks:

Configure the Analog Output Parameters

• Set Process Variable Units (page 2-8)

• Set Output Type – Linear or Square Root (page 2-8)

• Set the Range Points (page 2-9)

• Set Damping (page 2-12)

Calibrate the Sensor

• Full Trim (page 2-18)

• Zero Trim (page 2-17)

Calibrate the 4–20 mA Output (Digital-to-Analog [D/A]

Signal Conversion)

• 4–20 mA Output Trim (page 2-19) or

• 4–20 mA Output Trim Using Other Scale (page 2-19)

Figure 2-7 illustrates the Rosemount 3051N transmitter data flow. This data

flow can be summarized in four major steps:

1. A change in pressure is measured by a change in the sensor output

(Sensor Signal).

2. The sensor signal is converted to a digital format that can be

understood by the microprocessor (Analog-to-Digital Signal

Conversion).

3. Corrections are performed in the microprocessor to obtain a digital

representation of the process input (Digital PV).

4. The Digital PV is converted to an analog value (Digital-to-Analog

Signal Conversion).

Figure 2-7 also identifies the approximate transmitter location for each

calibration task. Note that the data flows from left to right, and a parameter

change affects all values to the right of the changed parameter.

Not all calibration procedures should be performed for each Rosemount

3051N transmitter. In addition, some procedures are appropriate for bench

calibration but should not be performed during field calibration. Table 2-2

identifies the recommended calibration procedures for each type of

Rosemount 3051N transmitter for both bench and field calibration.

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Emerson 3051N Manuel d'utilisateur Page 27