Humistor

A humistor is a type of variable resistor whose resistance varies based on humidity.

A humistor has a ceramic composition comprising at least one component having a spinel type cubic symmetry selected from the group consisting of MgCr2 O4, FeCr2 O4, NiCr2 O4, CoCr2 O4, MnCr2 O4, CuCr2 O4, Mg2 TiO4, Zn2 TiO4, Mg2 SnO4 and Zn2 SnO4, and , if desired, at least one component selected from the group consisting of TiO2, ZrO2, HfO2 and SnO2. A humidity sensor has a sensing portion which usually comprises a humidity-sensitive resistor composed of an organic polymer, such as a polyamide resin, polyvinyl chloride or polyethylene, or a metal oxide.