Water is a kind of strong electrolyte. Water molecules have larger electric dipole moment, near the hydrogen atoms have great positive electric field, so it has a lot of electron affinity, makes the easy adsorption of water molecules in the solid surface and penetrate the solid inside. This feature using water molecules made of humidity sensor is called water molecule affinity type sensor. And has nothing to do with the water affinity of humidity sensor is called the water molecule affinity type sensor. Used in modern industrial humidity sensor is mostly water molecules affinity type sensors, they will be humidity changes into the impedance or output after the change of capacitance value.

A molecule of water affinity and affinity of water molecules.

Type water affinity and points 1. Carbon film and selenium membrane humidity sensor 2. Metal oxide ceramic humidity sensor (3) metal oxide membrane humidity sensor 4. 6 crystal polymer humidity sensor 5 electrolyte humidity sensor a humidity sensor.

Affinity of water molecules can be divided into 1 thermistor type humidity sensor 2 infrared humidity sensor 3 microwave humidity sensor 4 ultrasonic humidity sensor