Discussion
What does a catalytic bead sensor detect?
Answer: D
A pellistor holds a catalysed bead and a matched inert bead in a bridge; flammable gas burns on the catalysed one, warming it and unbalancing the bridge. It is the standard sensor for lower explosive limit monitoring in industry. Electrochemical cells handle toxic gases, paramagnetism is the oxygen method, and thermal conductivity is the katharometer, which the inert bead is there to cancel. Being a combustion measurement, it needs oxygen to work and can be poisoned by silicones and by sulphur compounds.
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