He/O2 Analyzer - Gas Purity Mode & Accuracy Questions
Understanding gas purity mode and measurement accuracy in He/O2 analyzers
Question:
Stuff you wanted to know about "gas purity" mode, its detection of gases like Argon without a dedicated sensor, and the measurement accuracy.
Answer:
The "gas purity" mode measures any binary gas mix where the components' Voices of Sound (VOS) are sufficiently different. It does not use the oxygen sensor. For example, it can measure argon contamination in air (air is treated as oxygen and nitrogen mixture, other gases are omitted) but cannot measure oxygen in air. Due to VOS similarities, accuracy is lower than standard Trimix measurement (typical error 1% at both ends, 3% in middle).