Almost all modern low-cost combustible gas detection sensors are electrocatalytic type. They contain a very small sensing element, sometime…
Almost all modern low-cost combustible gas detection sensors are electrocatalytic type. They contain a very small sensing element, sometimes called "bead (beads)," "Pellistor," or "Siegistor"—the latter two have already been registered as commercial device trade names. They are made using an electrically heated platinum metal helix, which is covered by two layers of material: the inner layer is a ceramic substrate such as alumina, and the outer layer is the final external platinum coating or rhodium catalyst dispersed on the thorium oxide substrate.
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