What is the first step when analyzing Nitrox cylinder content?

The first step when analyzing Nitrox cylinder content is to calibrate the analyzer. This is crucial because calibration ensures that the analyzer is providing accurate readings for the fraction of oxygen (FO2) in the gas mixture within the cylinder. During calibration, the analyzer is adjusted to recognize known oxygen concentrations, typically using a calibration gas that has a specific percentage of oxygen.

By calibrating the analyzer first, divers can trust that the results obtained after measuring the cylinder content are reliable and precise. Accurate readings are vital for safe diving practices, as the oxygen content directly influences the dive plan, including depth limits and necessary decompression procedures. When the analyzer is not calibrated, any subsequent analysis would be at risk of error, potentially leading to unsafe diving conditions.

Labeling the cylinder, analyzing the FO2, and connecting the analyzer to a calibration source are important steps that follow after ensuring the analyzer is correctly calibrated. However, without this foundational step, the integrity of the entire analysis process could be compromised.