Polynomial Fit-Based Linearization of NTC Thermistor and Construction of Temperature Alarm for HTST Pasteurization

This study presents a novel method to transform the nonlinear resistance-temperature characteristics exhibited by the 334NTC103RC thermistor into a linear response suitable for industrial applications. This is achieved by employing a voltage divider circuit to convert the thermistor’s resistance value into an electrical signal. Subsequently, the least squares method is implemented within a microcontroller to linearize the initially nonlinear voltage output. The setup is then integrated into a real-time temperature monitoring system to ensure that the milk temperature is maintained below 72 degrees Celsius during the High-Temperature Short-Time (HTST) pasteurization process. An alarm system has been incorporated into the setup, which serves as a fail-safe mechanism, promptly alerting operators when the temperature exceeds the specified target, thus guaranteeing the consistent and safe production of pasteurized milk within stringent quality parameters.