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The PT100 temperature sensor is a kind of instrument that converts temperature variables into a standardized output signal that can be transmitted. It is mainly used for measurement and control of industrial process temperature parameters. Transducers with sensors are usually made up of two parts: sensors and signal converters. Sensors are mainly thermocouples or thermal resistors; signal converters are mainly composed of measurement units, signal processing and conversion units (due to the standardization of industrial thermal resistance and thermocouple indexing tables, so signal converters are also called transmitters as independent products), and some transmitters add display units and some are also provided. There is field bus function.