TASCO Exit Exam • Set 3 Question 26 of 30
What is the limitation of a combustible gas detector of catalytic combustion type?
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Direct Answer
Option D: 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.
All Options
A
It cannot be used for measurement in air
B
It cannot be used for measurement in oxygen
C
It cannot be used for measurement in methane
D
It cannot be used for measurement in nitrogen
(Correct Answer)
Detailed Explanation & Context
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.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Oil Tanker Cargo Operations (TASCO).
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