GB/T 43503-2023 in English

3.1 Selection and calibration of measurement system

When selecting an oxygen content measurement system, the following points should be given priority:

• Ensure that the performance of the pre-treatment unit (such as filter, pressure controller) meets the standard requirements.
• The detection limit of the electrochemical sensor must be lower than $0.0001\%$ to meet the accurate measurement of low concentration oxygen content.
• Calibrate using standard materials regularly and record the calibration results for inspection.

3.2 Data Processing and Quality Control

During data processing, special attention should be paid to the following matters:

• Repeatability and reproducibility are key indicators to ensure the reliability of measurement results and should be verified in strict accordance with standard requirements.
• For abnormal data, the reasons should be recorded in detail and analyzed, and re-sampled and measured if necessary.
• The measurement report should contain complete sample information, instrument status and operator information.