The humidity sensor is a device that senses, measures, and reports the relative humidity (RH) of air or determines the amount of water vapor present in gas mixture (air) or pure gas. Humidity sensors work by detecting changes that alter electrical currents or temperature in the air. There are three basic types of humidity sensors: capacitive, resistive and thermal. All three types will monitor minute changes in the atmosphere in order to calculate the humidity in the air.
Schneider Electric’s comprehensive range of humidity sensors are active sensors that measure relative humidity and convert the measurement into two selectable output signals. The SHR models have an embedded temperature sensing element. For implementation, humidity sensors must meet a variety of characteristics, including repeatability, sensitivity, reproducibility, linearity, low hysteresis, fast response-recovery speed, stability, low cost, and ease of connection to control units.
Humidity sensors are commonly used in the meteorology, medical, automobile, HVAC and manufacturing industries. Humidity sensors can be divided into two groups, as each category uses a different method to calculate humidity: relative humidity (RH) sensors and absolute humidity (AH) sensors.
