Calibration after deep cleaning involves four simple and precise steps, maximizing accuracy recovery:
1. Thermal Stabilization After Reassembly
After cleaning, reinstall the sensor in the hot runner and heat it to your normal operating temperature. Hold for 30 minutes to ensure the sensor and hot runner temperatures are completely synchronized, avoiding additional errors caused by temperature differences.
2. Zero-Point Calibration After Complete Pressure Relief
Completely depressurize the injection molding machine, emptying the melt from the runner to ensure zero pressure. Let it stand for 10 minutes until the sensor output is fully stable.
On the injection molding machine system/sensor amplifier, adjust the current zero-pressure output to the standard value: the default for current output types is 4mA. Save the parameters after adjustment to complete zero-point calibration.
3. Full-Scale Compensation Deviation
After zero-point calibration, increase the pressure to 80% of the sensor's range (e.g., 400 bar for a 500 bar range), hold the pressure for 5 minutes until the output stabilizes.
Compare the sensor's current output with the standard theoretical output, compensate for the deviation in the system parameters to ensure the output matches the standard value, and save the full-scale parameters.
4. Retest and Verify Calibration Results
Repeat the "depressurize → increase pressure" operation once, checking the zero-pressure and full-scale outputs respectively: Zero-pressure deviation ≤ 0.02mA, full-scale deviation ≤ nominal accuracy indicates successful calibration.
After calibration, it is recommended to retest the zero point once a day before starting work to track deviation changes and replace the sensor promptly upon arrival of a new one.
