Gas Sensor Working - Types And Working Principle Of Gas Sensor

1. GAS SENSOR WORKING - TYPES AND WORKING PRINCIPLEOFGAS SENSOR Gas sensor working is on the principle of detecting changes in electrical conductivity or resistance in response to the presence of a specific gas. Gas sensors are electronic devices designed to detect and measure the presenceofvariousgasesintheenvironment.These sensorsareusedinawide range ofapplications, from monitoring airquality todetectingleaksin industrialenvironments.Wewill discuss the working principle of gas sensor and the different types of gas sensors available in the market. GasSensorWorking-WorkingPrinciple

2. Whenagas moleculeencountersthesensor'ssurface, it reactswiththesensor's material,which altersitselectricalproperties. This changeinthe electricalproperties is then measured and used to determinetheconcentrationofthegas inthe environment. There aretwomaintypesof gassensorsbased on their workingprinciple- ChemicalGasSensors Chemical gas sensors work by detecting changes in the chemical composition of the gas in the environment. They use a sensing material that reacts with the target gas to produce a measurable changeinthesensor'selectricalconductivityorresistance. Thesesensorsarehighly selective and can detectspecificgases withhighaccuracy. PhysicalGasSensors Physical gas sensorsworkby detectingchanges in thephysicalproperties ofthegas inthe environment,such asitsthermalconductivityoritsability toabsorb light. Thesesensors arenotas selectiveas chemical sensors and candetectawiderangeofgases. TypesofGasSensors Thereareseveral types of gassensors availablein themarketforseveralgassensorapplications, each designed todetectspecifictypes of gases.Someofthemostcommon types ofgas sensors are: CarbonMonoxide(CO)Sensor Carbonmonoxideis atoxicgasthatis produced by incompletecombustion of fuelssuch asgasoline, propane,andnaturalgas.Carbonmonoxide sensorsaredesignedtodetectthe presence ofcarbon monoxide in theenvironmentandalertpeopleif theconcentrationofthegasexceedsacertain level. These sensors are commonly used in homes, garages, and industrial environments where the riskof carbon monoxidepoisoningishigh.

3. Oxygen(O2)Sensor Oxygen sensors are designed to detect the presence of oxygen in the environment. They are commonly used in medicalapplicationssuch ashospitalsandclinicstomonitortheoxygenlevelsin patients'blood. CombustibleGasSensor Combustible gas sensors aredesigned to detectthepresenceof flammablegases suchasmethane, propane,andbutane. Thesesensorsarecommonly used inindustrialenvironmentswheretherisk of explosionorfireishigh. HydrogenSulfide(H2S)Sensor Hydrogen sulfide is a toxic gas that is commonly found in natural gas, petroleum, and sewer systems. H2S sensors are designed to detect the presence of hydrogen sulfide in the environment and alert people iftheconcentrationofthegasexceedsa certainlevel.Thesesensorsarecommonlyusedin oil andgasrefineries, wastewatertreatmentplants, andotherindustrialenvironments. NitrogenDioxide(NO2)Sensor Nitrogen dioxide is a toxic gas that is produced by the combustion of fossil fuels. NO2 sensors are designed to detect the presence of nitrogen dioxide in the environment and alert people if the concentration of the gas exceeds a certain level. These sensors are commonly used in urban environmentstomonitorairquality. Conclusion Gas sensors are critical devices that play a vital role in ensuring safety in various industries and environments. They are designed to detect and measure the presence of various gases in the environment,andtheywork by detecting changes in theelectricalconductivity orresistanceof the sensingmaterial. There are several types of gas sensors available in the market, each designed to detect specific types ofgases. Byunderstanding theworkingprincipleand typesofgas sensorsavailable,wecanmake informeddecisionsaboutthetypeofgassensorto useinaparticularenvironment.