Discussion
What is the chief advantage of a paramagnetic oxygen analyser?
Answer: A
Because no other common gas is appreciably paramagnetic, the measurement is close to specific, and being physical rather than chemical it neither consumes the sample nor wears out. Electrochemical cells are far cheaper but have a limited life, a zirconia probe is the one that works hot and in situ, and every analyser needs periodic zero and span checks. Longevity and freedom from interference are what justify the higher price in laboratory and medical service.
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