Before calibrating, check for any potential faults.
Check that the thermocouple installation depth is proper, the sensing end is fully in touch with the hot runner temperature measurement point, the wire terminals have no loose connections, and the insulation resistance is ≥1MΩ. Eliminate hardware faults that cause incorrect temperature readings.
Check the thermocouple calibration settings in the Husky temperature controller to ensure a precise match with the thermocouple and no parameter mismatches.
Calibration technique with specific goals in mind. Heat the hot runner to the standard production temperature and keep it stable for 30 minutes. Use a calibrated standard thermocouple to determine the actual temperature at the same location in the hot runner.
Calculate the correction value: Correction value = actual temperature minus temperature indicated on the temperature controller. For example, if the temperature controller shows 240℃ but the real temperature is 237℃, the adjustment value is -3℃.
Navigate to the "Sensor Calibration" option on the Husky temperature controller, select the temperature offset parameter, enter the computed corrected value, and save.
Restart the temperature controller's PID self-tuning software so that the system can adjust to the new temperature measurement values and optimise the temperature control curve.
Verify post-calibration by running at a constant temperature for 30 minutes. The temperature deviation between the controller's display and the measured value of the standard thermocouple should be ≤ ±1℃, with a temperature fluctuation range of ≤ ±1℃.
Re-measure the actual temperature of the hot runner with an infrared thermometer to ensure that the temperature measurement accuracy across the whole temperature range is within the norm. This completes the calibration process, and the temperature inaccuracy issue is rectified.
This calibration procedure is specifically designed for situations where temperature drift occurs following a Husky temperature controller reset, instantly restoring measurement accuracy and meeting the severe temperature control requirements of hot runner injection moulding production.
