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Paramagnetic oxygen analyser — FRCA Primary MCQ

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ModeratePhysics and Clinical MeasurementParamagnetic oxygen analyserFRCA Primary

During rapid changes in inspired oxygen concentration, the analyser gives a fast response and uses oxygen's attraction into a magnetic field. Which device is being used?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: D — Paramagnetic oxygen analyser

Oxygen is paramagnetic, and paramagnetic analysers use this property to provide rapid oxygen measurement. Galvanic fuel cells are slower and consumable. Infrared analysers are used for gases such as CO2 and volatile agents. Fast oxygen measurement is useful during anaesthetic machine checks and changes in fresh gas composition.

Reference: Dorsch and Dorsch Understanding Anesthesia Equipment; Primary FRCA physics texts