Siemens SITRANS P Bedienungsanleitung PDF herunterladen (Seite 153)

UMSITRAPDS3-1 Circuit Description

November 2010

8-1

8.0 CIRCUIT DESCRIPTION

This section provides a basic circuit description of the SITRANS P DSIII Pressure Transmitter. Figure 8-

1 shows the functional block diagram. Basically the transmitter consists of two active components: a

measuring cell and an electronics module. Input pressure is piped to the measuring cell (1) that includes

diaphragms, fill fluid, and related components. The output signal from the measuring cell goes to the

electronics module that consists of the microcontroller (4), A/D (3) and D/A (5) converters, HART

modem (7), and related components. The magnetic pushbuttons (8) and display (9) connect to the

electronics module.

The transmitter family consists of four model types: flow, differential pressure, absolute pressure, and

flange-mounted liquid level. All models use the same interchangeable electronics module, display,

enclosure, and magnetic pushbuttons. The major difference between models is the measuring cell.

The transmitters can communicate with a Model 275 HART Communicator, Model 375 Field

Communicator, or a Primary Master controller using the HART protocol.

Measuring cell sensor

Instrument amplifier

Analog-digital converter

Microcontroller

Digital-analog converter

Two non-volatile memories in the measuring

cell and electronics

HART modem

Magnetic pushbuttons for local operation

Digital display

Analog output test terminals

Output current

Power supply

FIGURE 8-1 Transmitter Block Diagram

1 2 ... 148 149 150 151 152 153 154 155 156 157 158 ... 221 222

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