Humidity Sensors

A humidity sensor It is a device designed to measure the amount of water vapor present in the air or in specific materials by detecting changes in physical or chemical properties of a moisture-sensitive material. These sensors are essential in various applications, since humidity influences industrial processes, environmental conditions and the preservation of materials. These types of sensors exist to measure humidity:

1. Capacitive Sensors: They measure variations in the capacitance of a hygroscopic material that absorbs water vapor. The dielectric constant of the material changes with humidity, which affects the measured capacitance.
2. Resistive Sensors: They detect changes in the electrical resistance of a conductive material that changes its conductivity when absorbing humidity. These sensors are usually cheaper and suitable for applications where a fast response is required.
3. Thermal Conductivity Sensors: They measure a material's ability to conduct heat, which varies with the amount of moisture present. They are useful in high temperature environments and corrosive situations.