Description: Temperature measurement in todayТs industrial environment encompasses a wide variety of needs and applications. To meet this wide array of needs the process controls industry has developed a large number of sensors and devices to handle this demand. Temperature is a very critical and widely measured variable for most mechanical engineers. Many processes must have either a monitored or controlled temperature. In this paper it has been used a practical solution of the temperature relay module with high accuracy. For achieving this aim practical measurement and program analysis have been made. Also mathematical equation is used in term of proof the accuracy