When analyzing a nitrox blend, what must remain the same as when the unit was calibrated with air?

When analyzing a nitrox blend, it is crucial that the flow rate remains the same as when the unit was calibrated with air. This is because the calibration of the analyzing device is determined based on a specific flow rate of the gas passing through it. If the flow rate changes, it can affect the measurements taken by the analyzer, leading to inaccurate readings of the oxygen content in the nitrox blend.

Maintaining a consistent flow rate ensures that the analyzer operates within the parameters it was designed for, allowing for precise and reliable readings. If the flow rate is altered, even if all other conditions, such as temperature, pressure, and humidity, stay the same, the analyzer may not function correctly and may yield erroneous results regarding the gas mixture being analyzed.