Preparation Before Calibration
1. Determine the Calibration Cycle: Adjust the cycle flexibly based on the sensor type (e.g., industrial, high-precision laboratory, or consumer), operating environment (normal or harsh), and industry standards (e.g., medical, food cold chain). For example, industrial-grade sensors are recommended to be calibrated every 6 months to 1 year in normal environments, and every 3 to 6 months in harsh environments.
2. Prepare Tools and Equipment: Select a standard calibration device with higher accuracy than the sensor being calibrated (e.g., temperature calibrator, pressure pump, etc.), and ensure that the connection cables are secure and free from interference.
3. Check Sensor Condition: Before calibration, check the sensor for damage or corrosion, and verify that the model number matches the system requirements.
Detailed Calibration Steps
1. Environmental Control: Place the sensor in a calibration chamber with stable temperature and humidity, avoiding electromagnetic interference.
2. Zero-Point Calibration: Place the sensor in a no-input state (e.g., no pressure, no displacement), and adjust the parameters to make the output signal consistent with the theoretical zero point.
3. Full-scale calibration: Place the sensor at full scale, record the calibration equipment readings, and adjust the parameters to ensure the output error is within the allowable range.
4. Partial calibration (optional): High-precision sensors can be calibrated at multiple points between zero and full scale to improve accuracy.
5. Recording and verification: After calibration, detailed data recording is required, and stability must be verified through repeatability testing (if the error change is ≤0.1℃, the cycle can be appropriately extended).
Special Case Handling
1. Scenarios requiring immediate recalibration: Immediate calibration is required after sensor repair, when measurement deviations occur, or when exposed to extreme environments (such as high temperatures or corrosive gases).
2. Industry standard requirements: Medical, nuclear power, and other fields may mandate shorter cycles (such as ≤1 year or calibration before each use).
Maintenance and Recording
1. Regular cleaning: Remove surface dirt with a soft cloth or professional cleaning agent. Optical/gas sensors require a protective cover. 2. Connection Check: Regularly check the connection cables and plugs for looseness or damage to ensure stable signal transmission.
3. Establish Maintenance Records: Record the time, content, and results after each calibration to facilitate tracking performance trends.
