Humidity sensors work by detecting changes that alter electrical currents or temperature in the air, according to Sensors Online. There are three basic types of humidity sensors: capacitive, resistive and thermal. All three types of sensors monitor minute changes in the atmosphere in order to calculate the humidity in the air.Know More
A capacitive humidity sensor measures relative humidity by placing a thin strip of metal oxide between two electrodes. The metal oxide's electrical capacity changes with the atmosphere's relative humidity. These types of sensors are used for weather, commercial and industrial applications.
Resistive humidity sensors utilize ions in salts to measure the electrical impedance of atoms. As humidity changes, so does the resistance of the electrodes on either side of the salt medium. State-of-the-art resistive humidity sensors use ceramics to overcome areas where condensation occurs.
Thermal conductivity sensors measure changes in heat to detect humidity. Two thermal sensors conduct electricity based upon the humidity of the surrounding air. One sensor is encased in dry nitrogen as a comparison to the other sensor which measures the ambient air. The difference between the two measures the humidity.
The reason these detection methods work is that humidity changes with air temperature, according to Tech-FAQ. Humidity sensors are vital to weather stations, industrial processes and HVAC systems.Learn more in Weather & Tides
Humidity can reduce static electricity. Water conducts electricity, so humidity in the air allows static electricity to leave objects.Full Answer >
The instrument used to measure humidity is known as a hygrometer. Hygrometers may be used to measure the relative humidity or absolute humidity in the air.Full Answer >
Forty-five percent relative humidity is the comfortable relative humidity level. Below 30 percent humidity, the air feels dry, and above 52 percent relative humidity, the air feels very moist.Full Answer >
The actual humidity in terms of the water content of air is typically expressed as grams per kilogram or kilogram per kilogram. Humidity is typically expressed as a percentage of how humid it could physically be at a given temperature.Full Answer >