What are the specific steps for deep cleaning and calibration compensation?

This is a thorough, step-by-step procedure based on factory practice; each step is straightforward and doable:

 

1. Pre-treatment and disassembly

To prevent burns from excessive temperatures, remove the sensor once the hot runner has fully cooled to a safe temperature;

Wipe the entire sensor, including the detecting diaphragm region, with a lint-free cloth moistened with anhydrous alcohol after using a clean brush to remove any large collected material from the surface.

 

2. Thoroughly Cleaning the Diaphragm

Use a soft copper sheet to gently scrape off any remaining melt or corrosion deposits that have formed on the diaphragm; avoid using a hard steel sheet to prevent scratching the diaphragm. Don't puncture or penetrate the diaphragm; instead, use mild pressure and scrape along its plane;

Use metallographic sandpaper with 800 grit or more (the finer the better) curled into a sharp corner to gently sand the diaphragm surface if there is a thin layer of oxide. After sanding, use anhydrous alcohol to rinse away the sandpaper residue, then pat dry.

 

3. Thermal stabilization and reinstallation

After reinstalling the sensor and applying a tiny bit of high-temperature sealant to the mounting threads, tighten it to the recommended torque as directed by the handbook; do not overtighten or loosen.

To fully achieve thermal stability and avoid temperature variations impacting calibration accuracy, heat the sensor to the standard production temperature and hold it there for half an hour.

 

4. Calibration at Zero Point

Make sure the pressure inside the flow channel is zero by completely depressurizing and emptying it. To give the output time to stabilize, let it stand for ten minutes.

Save the zero-point parameters and set the current zero-pressure output in the injection molding machine system/sensor amplifier to the standard value (4mA by default for current-type sensors).

 

5. Compensation for Full-Scale Calibration

To enable the output to stabilize, raise the pressure to 80% of the sensor's range and hold it there for five minutes.

Make sure the output is in line with the standard value, adjust for the system's variance, and compare the real and theoretical outputs. Preserve the parameters.

 

6. Monitoring Follow-Up Once the calibration is complete, retest the zero point once daily prior to the start of the workday and turn on the injection molding machine's daily automated zero point adjustment. Stop the machine ahead of time to get ready for replacement if a deviation is discovered to quickly surpass the standard.