Introduction to humidity sensors
The humidity sensitive element includes an electrolyte humidity sensor, an organic polymer film humidity sensor, a metal oxide humidity sensor, a ceramic humidity sensor, and the like. The sensitivity of the humidity sensitive resistor is expressed by the rate of change of the resistance value when the relative humidity changes by 1%. The resistance value of most humidity sensitive resistors decreases with increasing humidity. Such humidity sensitive resistors are called negative characteristic humidity sensitive resistors. There are also a few humidity sensitive resistors whose resistance increases with increasing humidity. The humidity sensor is mainly used for humidity measurement and control. It can be divided into high humidity type, low humidity type and full wet type according to the humidity measuring range. It is widely used in meteorological, food, textile, light industry departments and environmental air conditioning, warehouse facilities.