So in simple: When VOC gases contacts the sensor resistance increases which reduces the electric conductivity.
#Air quality weather calculator free#
So when VOC gases comes in contact with the metal oxide sensitive surface the gases react with the oxygen molecules on the surface thus the electrons are free from oxygen molecules which reduces the potential barrier and increases the flow of electric current. In the clean air the electrons in the Metal Oxide are attracted to Oxygen molecules in the air and forms a potential barrier which resists the flow of electric current. When the sensor is turned on the heater heats the metal oxide surface and oxygen is absorbed on the surface. Generally Metal oxide based sensors have metal oxide sensitive surface, a chip to measure the electrical conductivity and a heater to heat the surface of the sensitive metal oxide.
#Air quality weather calculator software#
Dew point (can be calculated through software code using temperature and Humidity)īME680 gas sensor has metal oxide(MOx) surface to measure the VOC gases in the surrounding environment.What parameters can BME680 measures and detects?Īs we learnt from the above paragraph, The 4 in 1 sensor BME680 is the combination of temperature, humidity, Pressure and Gas sensors which can measure the below parameters with greater accuracy. Each category has different chemical properties, giving rise to different problems. VOCs include hydrocarbons, alcohols, aldehydes and organic acids, solvents, liquid fuels, synthetic substances and numerous organic compounds formed in the course of biological processes. This includes emissions from automotive and industrial activities, among others. They are pollutants produced as a result of combustion, the processing of paints, adhesives, petroleum products, pharmaceuticals and refrigerants. They are compounds that evaporate easily under normal conditions of temperature and pressure and their volatility gives them the ability to spread in the environment and modify their chemical composition. they contain carbon and are found in gaseous form in the air. Volatile organic compounds (VOCs) are substances from organic origin, i.e.
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