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Which of the following is not the drawback of conventional infrared analyzers used for gas analysis?

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Which of the following is not the drawback of conventional infrared analyzers used for gas analysis?

(a) Cell is difficult to maintain

(b) It is expensive to replace

(c) Detector is vibration sensitive

(d) Only one source is used

I had been asked this question in an internship interview.

The question is from Infrared Gas Analysers in chapter Industrial Gas Analysers of Analytical Instrumentation

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Correct answer is (d) Only one source is used

The best I can explain: Two sources are used in conventional infrared analyzers used for gas analysis. To overcome the drawbacks an improved model was created.

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