Increasing Accuracy of Temperature Measurement Based on Adaptive Algorithm for Microcontroller Transmitter

A temperature transmitter is an electronic device that converts the temperature measured by a sensor to the proportional electrical or digital value. It is necessary to measure the resistance of a sensor with high accuracy (at the input terminals of the transmitter) for platinum sensors applications. The temperature calculation depends on the functional relationship to the measured resistance. The generated electrical signal is linearly proportional to the calculated temperature. NAMUR-Recommendations for the use of temperature transmitters with digital signal processing in the chemical industry NE89 [1] precisely define the properties that such a device must have. The recommendations describe the dimensions of the device (to be inserted into the thermometer head or on the rail) and the value of the output signal, which must be proportional to the measured temperature, or in the case of the error it must show the alarm condition. The values of the output signal are given in the recommendation NE43 [2], and the behavior in the event of electromagnetic interference is governed by the recommendation NE21 [3]. The recommendation NE53 [4] deals with the issue of identification, version control and stability of the software, and the recommendation NE79 [5] regulates the behavior, use and verification of microprocessor-temperature transducers in the safety instrumentation systems (SIL). The aim of this study is to compare the effects caused by different calculation methods on the accuracy of temperature measurement. The measurement error of the