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Which of the following methods are mainly used in combustible gas detection equipment?

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in Analytical Instrumentation by (131k points)
Which of the following methods are mainly used in combustible gas detection equipment?

(a) Lead acetate tape staining method

(b) Solid state sensor

(c) Gold film sensor

(d) Electrochemical cells

The question was asked in a job interview.

I need to ask this question from H2S Analysers in section Industrial Gas Analysers of Analytical Instrumentation

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Right answer is (b) Solid state sensor

To explain I would say: Solid state sensors are mainly used in combustible gas detection equipment. It is a semiconductor sensor.

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