Question 11 of 30
What is the limitation of a combustible gas detector of catalytic combustion type?
A
It cannot be used for measurement in air
B
It cannot be used for measurement in nitrogen
C
It cannot be used for measurement in methane
D
It cannot be used for measurement in oxygen
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Answer & Explanation
The correct answer is Option B: It cannot be used for measurement in nitrogen.
Catalytic combustion (pellistor) sensors require oxygen to oxidize the hydrocarbon sample on the filament. Therefore, they cannot function in an inerted environment (e.g., nitrogen) where oxygen is absent.