Catalyticbead
Catalyticbead, commonly referred to as a catalytic bead, is a small ceramic bead used as the catalytic element in pellistor-based combustible gas sensors. It is coated with a platinum-group catalyst that promotes the oxidation of combustible gases such as methane, propane, and hydrogen when they reach the bead surface. The exothermic reaction raises the bead's temperature, producing a measurable change in its electrical resistance.
In typical sensors, the catalytic bead is paired with a second inert bead to form a differential,
Construction often uses a ceramic core (alumina) coated with dispersed platinum-group metal catalysts on a support
Applications include portable and fixed gas detectors for industrial safety, mining, refinery, and environmental monitoring, particularly