Wright's Respirometer — FRCA Primary MCQ
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Correct answer: A — Tidal volume and minute volume
The Wright's respirometer is a mechanical device containing a rotating vane driven by exhaled gas flow. It measures expired volume (and therefore tidal and minute volume). It tends to over-read at high flow rates and under-read at low flow rates. It measures volume not flow. Modern electronic equivalents use turbine or ultrasonic flow sensors.
Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment