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How can corrosion be prevented in a resistance thermometer?

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How can corrosion be prevented in a resistance thermometer?

(a) by immersing the setup in oil

(b) by enclosing the elements in a glass tube

(c) by using guard rings

(d) by painting the elements

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This intriguing question comes from Resistance Temperature Detector in section Transducers of Electrical Measurements

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Correct answer is (b) by enclosing the elements in a glass tube

The best explanation: Corrosion can be eliminated in a resistance thermometer by enclosing the elements in a protective tubular glass made of pyrex, quartz or crystal depending upon the temperature range.

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