Emerson 3051S Dokumentacja Pobierz pdf (Strona 77)

Reference Manual

00809-0100-4801, Rev FA

October 2010

4-3

Rosemount 3051S Series

Calibrate the sensor

• Sensor Trim (page 4-6)

• Zero Trim (page 4-6)

Calibrate the 4–20 mA output

• 4–20 mA Output Trim (page 4-8); or

• 4–20 mA Output Trim Using Other Scale (page 4-9)

Figure 4-1 on page 4-3 illustrates 3051S transmitter data flow. 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 is 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 4-1 also identifies the approximate transmitter location for each

calibration task. 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 3051S

transmitter. Some procedures are appropriate for bench calibration, but

should not be performed during field calibration. Table 4-1 identifies the

recommended calibration procedures for each type of 3051S transmitter for

bench or field calibration.

Figure 4-1. Transmitter Data

Flow with Calibration Options

Transmitter Ranged 0 to 100 inH

(0 to 0,25 bar)

A/D

(STEP 2)

MICRO

(STEP 3)

D/A

(STEP 4)

Output:

20.00 mA

Output: 100 in. H

Pressure

Source

SENSOR

(STEP 1)

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 239 240

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