Discussion
How does an electrochemical oxygen cell produce its output?
Answer: D
Oxygen diffusing through a membrane is reduced at the cathode, and the resulting current is proportional to the oxygen partial pressure. In a galvanic cell a lead or zinc anode is consumed, which is why such cells have a finite life measured in months and eventually simply stop. They are cheap, small and linear, which suits portable and safety instruments, but they are temperature sensitive and are poisoned by some acid gases. The consumable anode is real but is not where the signal is generated.
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