Question

When would the recorder indicate a zero base line in analyzers based on gas density?

(a) When the detector on the sample side is cooler than that on the reference side

(b) When the detector on the reference side is cooler than that on the sample side

(c) When flow is unbalanced

(d) When both the detectors are equally cooled

The question was posed to me by my school teacher while I was bunking the class.

Origin of the question is Analysers Based on Gas Density topic in section Industrial Gas Analysers of Analytical Instrumentation

Answer 1

Correct option is (d) When both the detectors are equally cooled

The best I can explain: The recorder indicates a zero base line in analyzers based on gas density when a flow is balanced. When a flow is balanced both the detectors are equally cooled.