Transcription of Precision Temperature-Sensing with RTD Circuits
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Precision Temperature-Sensing with RTD Circuits
2003 Microchip Technology 1 MAN687 INTRODUCTIONThe most widely measured phenomena in the processcontrol environment is temperature. Common ele-ments, such as Resistance Temperature Detectors(RTDs), thermistors, thermocouples or diodes are usedto sense absolute temperatures , as well as changes intemperature. For an overview and comparison of thesesensors, refer to Microchip s AN679, Temperature-Sensing Technologies , DS00679. Of these technologies, the platinum RTD Temperature-Sensing element is the most accurate and stable overtime and temperature. RTD element technologies areconstantly improving, further enhancing the quality ofthe temperature measurement (see Figure 1). Typi-cally, a data acquisition system conditions the analogsignal from the RTD sensor, making the analogtranslation of the temperature usable in the application note focuses on circuit solutions thatuse platinum RTDs in their design.
Precision Temperature-Sensing With RTD Circuits. ... the absolute resistance value of RREF and the RTD element. ... it ultimately provides a high-precision,
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