Calibration of Temperature Sensor -Thermocouple and Thermistor in Food Processing Retorts

The given thermocouple and thermistor are calibrated using stirred liquid bath method. The plot of voltage vs. temperature is drawn for the thermocouple and it is almost nonlinear and consistent with theoretical polynomial equation. Further, it is observed that there is no significant hysteresis of the temperature range of 0°C and 100°C. The nonlinear curve for the thermistor is obtained when the resistance against temperature is plotted. The constant β in the thermistor equation is found to be 3761K. Further, the sensitivity of the given thermistor is 1.00464 which is almost equal to the value of Load resistor’s resistance.