Create a Class II standard thermocouple, a low-potential DC potentiometer with an accuracy of 0.02, and a dry-block furnace/thermostat bath. Ensure that all standard equipment is within its calibration validity period.
Pre-heat the Husky thermostat and hot runner system for 30 minutes. Check that the thermocouple wiring is tight and not loose, the temperature field is steady, and there are no underlying hardware flaws like weak connections or short circuits.
Acquiring temperature data from multiple points in the field
Choose three typical temperature points: 20%, 50%, and 80% of the thermocouple range. Gradually increase the temperature from low to high while keeping a stable temperature at each point for at least 30 minutes. The temperature field change should be ≤0.2℃/min.
Follow the standard-calibrated-standard forward and reverse cyclic reading procedure. Measure each temperature point at least four times, documenting both the standard thermocouple's measured temperature and the Husky thermostat's displayed temperature. Calculate the indicator inaccuracy at each temperature point.
Linear Error Parameter Configuration
To create a full-temperature-range linear compensation curve, navigate to the Husky temperature controller's "Advanced Calibration" menu and select the multi-point linear compensation parameter setting interface. Enter the error correction values for three temperature points sequentially.
Confirm that the cold junction compensation settings precisely match the recorded ambient temperature at the wiring point, preventing any additional system faults caused by cold junction temperature drift.
Verification of the closed-loop system after calibration
After you've finished adjusting the parameters, run the temperature controller's PID self-tuning program to let the system adjust to the new linear compensation features and optimise the temperature control curve.
Run at a steady temperature for two hours. Select random temperature points across the entire temperature range for comparison testing with standard thermocouples to confirm that the temperature measurement deviation is ≤ ±1℃, linear error is completely eliminated, and temperature fluctuation is ≤ ±1℃.
