Why is it important to calibrate the oxygen analyzer with a reference gas?

Calibrating the oxygen analyzer with a reference gas is critical for ensuring accurate readings. When an oxygen analyzer is calibrated, it establishes a baseline or reference point that the device uses to determine the percentage of oxygen in a gas mixture. This process involves exposing the analyzer to a gas with a known concentration of oxygen, allowing it to adjust its internal parameters and confirm that the measurements it provides will be reliable and valid.

Accurate readings are essential for divers using nitrox because even small inaccuracies in oxygen levels can significantly impact safety and performance. For example, incorrect oxygen levels could lead to either hypoxia (not enough oxygen) or oxygen toxicity (too much oxygen), both of which pose serious risks during diving operations.

Other options do not effectively capture the primary purpose of calibration. Saving time, reducing gas flow, or increasing analyzer sensitivity are not the main objectives when calibrating an oxygen analyzer. The primary focus during calibration is to ensure that the instrument consistently provides precise and trustworthy measurements of oxygen concentrations necessary for safe diving practices.