CALIBRATION THERMOCOUPLE K-TYPE ON THE RANGE TEMPERATURE -10°C TO 30°C USING ASTM THERMOMETER AS REFERENCE

This research focuses on the calibration of four type K thermocouples in the temperature range -10°C to 30°C, using chamber water bath with high precision. The calibration process is carried out by comparing thermocouple readings with readings from ASTM standard thermometers, with data acquisition managed using National Instruments hardware and LabVIEW software. The results of research on the accuracy of type K thermocouples show a shift in linearity and uncertainty values/ uncertainty are within acceptable engineering tolerances. A linear correction equation for each thermocouple is derived to minimize measurement error, ensuring that the thermocouple provides reliable temperature readings for applications within the specified range. This research shows the importance of using high-precision calibration systems, such as ASTM thermometers, to improve thermocouple measurement accuracy, providing a comprehensive solution for precision temperature measurements.