Emerson 3051S Specifications download pdf (Page 83)

Reference Manual

00809-0100-4001, Rev JA

Section 4: Operation and Maintenance

November 2012

Operation and maintenance

Figure 4-1 on page 73 illustrates 3051 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). Sensor trim functions affect this

value. Select these options to alter the digital signal on the LCD or Field Communicator.

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).

Rerange and Analog trim functions affect this value. Select these options to change the

range points (4-20 mA or 1-5 Vdc).

For a summary of recommended calibration procedures, refer to Table 4-1 on page 4-74. Also,

Figure 4-1 on page 73 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.

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 ... 78 79 80 81 82 83 84 85 86 87 88 ... 221 222

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Emerson 3051S Specifications Page 83