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In solid state sensor, when heated to 150^o to 300^o which of the following occurs?(a) Resistance decreases with increase in H2S concentration(b) Resistance increases with H2S concentration(c) No change in resistance occurs(d) Sensor does not respond in this temperature rangeI have been asked this question in unit test.My question is based upon H2S Analysers topic in chapter Industrial Gas Analysers of Analytical Instrumentation

Answer»

Right option is (a) Resistance decreases with increase in H2S CONCENTRATION

The explanation is: In solid state sensor, when heated to 150^o to 300^o resistance decreases with increase in H2S concentration. The decrease in resistance is a LOGARITHMIC function of H2S concentration.



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