How Gas Purity mode works and its measurement accuracy
Gas Purity mode allows the He/O₂ analyzer to evaluate certain binary gas mixtures based on differences in the speed of sound. This article explains how the mode works and what accuracy can be expected.
How Gas Purity mode works
Gas Purity mode measures binary gas mixtures where the components have sufficiently different speeds of sound (VOS). This mode does not use the oxygen sensor.
For example, it can detect argon contamination in air. Air is treated as a mixture of oxygen and nitrogen, while other gases are omitted from the calculation. However, it cannot measure oxygen concentration in air using this mode.
Measurement accuracy
Due to similarities in the speed of sound between some gases, accuracy in Gas Purity mode is lower than in standard Trimix measurement.
Typical accuracy:
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Approximately ±1% at the low and high ends of the measurement range
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Up to ±3% in the middle of the range