How Do Humidity Sensors Work?
A Comprehensive Analysis of The Functions of Humidity Sensors
In the current environment, the surrounding conditions usually affect the normal operations of certain industries and human comfort at large. One of the components of the environment is the presence of water in the air which is known as humidity. Humidity contributes greatly tog physical, chemical and biological processes on earth. This fact has led to the development of HUMIDITY SENSORS that are able to indicate the humidity levels of an area.
Types of Humidity Sensors
There are two basic types of sensors and they include the following:
1. Relative humidity (RH) sensors
2. absolute humidity(moisture) sensors
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How Do Humidity Sensors Work?
These sensors detect the amount of water in the air in the immediate environment where they are usually placed. Aside from the humidity, they also measure the temperature of the area. By measuring the two, a sensor gives a percentage of the relative humidity in terms of the ratio of the amount of moisture in the air compared to the maximum amount that the air can hold at that specific temperature. When the temperatures are high, air expands and is able to hold a higher amount of moisture therefore the relative humidity changes with the temperature of the air.
A hygrometer usually uses the principle of capacitative measurement to determine the humidity. Capacitative measurement is whereby what is relied on are two electrical conductors that have a non-conductive polymer film lying between creating an electrical field between the conductors.
The moisture in the air is usually collects on the film which causes a corresponding change in the voltage levels between the electrical conductors. This change in the voltage is what is converted into digital measurement of the relative humidity of the air and this is done after taking the level of temperature in the air at the particular moment.
Uses of Humidity Sensors
They can be used either privately or publicly. Most private applications are in instances whereby an individual suffers from allergies or respiratory illnesses that might be caused or alleviated by the presence of low humidity. The sensors are also used at wine cellars to keep the air constant so as to enable wines to be stored for a very long period.
The most popular use of sensors is in the HVAC system that is used to maintain the quality of moisture and air in buildings. There is also the use of humidity sensors in cars for defrosting and defogging systems. They automatically regulate the amount of air and moisture used in the vehicle’s air conditioning systems. The most obvious use of hygrometers is in collecting weather data and analysis.
There are quite a number of HUMIDITY SENSORS MANUFACTURERS in the USA that provide top notch equipment that perform effectively and efficiently. When choosing a manufacturer, you should choose one that produces sensors that do not consume a lot of energy and that are safe to use.
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