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.
1
2
3
4
5
6
Measuring cell sensor
Instrument amplifier
Analog-digital converter
Microcontroller
Digital-analog converter
Two non-volatile memories in the measuring
cell and electronics
7
8
9
10
I
A
U
H
HART modem
Magnetic pushbuttons for local operation
Digital display
Analog output test terminals
Output current
Power supply
FIGURE 8-1 Transmitter Block Diagram
Summary of Contents for 7MF4033 series
Page 48: ...Model 275 Universal Hart Communicator UMSITRPDS3 1 November 2010 2 26 ...
Page 86: ...Installation UMSITRPDS3 1 November 2010 4 34 ...
Page 152: ...Calibration and Maintenance UMSITRPSD3 1 November 2010 7 20 ...
Page 158: ...Circuit Description UMSITRPDS3 1 November 2010 8 6 ...
Page 197: ......
Page 198: ......
Page 200: ...Model Designations and Specifications UMSITRPDS3 1 November 2010 9 42 ...
Page 204: ...Glossary UMSITRPDS3 1 November 2010 10 4 ...
Page 208: ...Appendix A Online Configuration Map UMSITRPDS3 1 11 4 November 2010 ...
Page 216: ...Appendix C Elevation and Suppression Correction UMSITRPDS3 1 13 4 November 2010 ...