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| | | © Siemens AG 2007 | | |
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| | | SITRANS P measuring instruments for pressure Transmitters for gage pressure for the paper industry | | |
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| | | SITRANS P300 and DS III serie with PMC connection - Technical descriptio | | |
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| | | Mode of operation of the DS III FF electronics | | Mode of operation of the measuring cell Measuring cell for gage pressure with front-flush diaphragm | | |
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| | | FF interface | | |
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| | | Power supply | | |
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| | | Measuring cell for gage pressure, with front-flush diaphragm, function diagram The pressure pe is applied through the process connection (2, Figure "Measuring cell for gage pressure, with front-flush diaphragm for paper industry, function diagram") to the measuring cell (1). This pressure is subsequently transmitted further through the industrial seal diaphragm (3) and the filling liquid (4) to the silicon industrial pressure sensor (5) whose measuring diaphragm is then flexed. This changes the resistance of the four piezo-resistors fitted in the diaphragm in a bridge circuit. This change in resistance results in a bridge output voltage proportional to the input pressure. | | |
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| | | Measuring cell | | |
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| | | Measuring cell sensor Instrument amplifier Analog-to-digital converter Microcontroller Electrical isolation One non-volatile memory each in the measuring cell and electronics FF interface | | Three input keys (local operation) Digital display Power supply | | |
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| | | pe Input variable | | |
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| | | Function diagram of electronics The bridge output voltage created by the sensor (1, Figure "Function diagram of electronics") is amplified by the instrument amplifier (2) and digitized in the analog-to-digital converter (3). The digital information is evaluated in the microcontroller, its linearity and temperature response corrected, and provided on the FOUNDATION Fieldbus through an electrically isolated FOUNDATION Fieldbus Interface (7). The data specific to the measuring cell, the electronics data, and the parameter data are stored in the two non-volatile memories (6). The one memory is coupled to the measuring cell, the other to the electronics. As the result of this modular design, the electronics and the measuring cell can be replaced separately from each other. Using the three input keys (8) you can parameterize the industrial pressure transmitter directly at the point of measurement. The input keys can also be used to control the view of the results, the error messages and the operating modes on the digital display (9). The results with status values and diagnostic values are transferred by cyclic data transmission on the FOUNDATION Fieldbus. Parameterization data and error messages are transferred by acyclic data transmission. Special software such as National Instruments Configurator is required for this. | | |
| | | Parameterization Depending on the version, there are a range of options for parameterizing the pressure industrial transmitter and for setting or scanning the parameters. Parameterization using the input keys (local operation) With the input keys you can easily set the most important parameters without any additional equipment. Parameterization using HART communication Parameterization using HART communication is performed with a HART communicator or a PC. | | |
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| | | Communication between a HART communicator and a pressure transmitter When parameterizing with the HART communicator, the connection is made directly to the 2-wire system. | | |
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| | | Siemens FI 01 • 2008 | | |
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