Impedance type polymer humidity sensor (humidity sensitive resistor) uses a functional polymer film coated on a ceramic substrate with conductive electrodes to form a sensitive component whose impedance changes logarithmically with relative humidity. The conductivity mechanism is that the presence of water molecules affects the mobility of conductive ions inside the polymer film.

Has good sensitivity characteristics and excellent long-term stability. The impedance linear curve is similar to imported sensors from abroad and can directly replace various other similar products from abroad.