Gas sensors tuaj yeem muab faib ua peb pawg loj raws li lawv cov qauv kev ua haujlwm:
Gas sensors siv lub cev thiab tshuaj muaj zog, xws li semiconductor raws li (sov tswj, ntim tswj, nto muaj peev xwm raws li), catalytic combustion raws li, khoom thermal conductivity raws li, thiab lwm yam. Gas sensors siv lub cev muaj zog xws li thermal conductivity, optical cuam tshuam, infrared nqus, thiab lwm yam. Gas sensors siv cov khoom siv hluav taws xob, hluav taws xob hluav taws xob, hluav taws xob hluav taws xob, thiab lwm yam. ion electrode, taag electrolyte, thiab lwm yam raws li kev phom sij, peb faib cov pa phem thiab cov pa phem rau hauv ob pawg: cov roj hluav taws xob hluav taws xob thiab cov pa phem. Vim lawv cov khoom sib txawv thiab kev phom sij, lawv txoj kev tshawb nrhiav kuj sib txawv.
Combustible gases yog cov pa phem uas feem ntau ntsib nyob rau hauv kev lag luam chaw xws li petrochemicals, feem ntau muaj cov organic gases xws li alkanes thiab tej yam inorganic gases xws li carbon monoxide. Kev tawg ntawm cov roj hluav taws xob yuav tsum ua kom tau raws li qee qhov xwm txheej, uas yog: qee qhov kev xav tau ntawm cov roj hluav taws xob, cov pa oxygen, thiab cov hluav taws kub uas muaj cua sov txaus los hlawv lawv, cov av noo sensor sojntsuam, stainless hlau hluav taws xob cua sov raj, PT100 sensor, kua solenoid valve, cam khwb cia txhuas rhaub, thiab cua sov co. Cov no yog peb lub ntsiab ntawm kev tawg (raws li qhia hauv daim duab peb sab tawg hauv daim duab sab laug saum toj), uas yog qhov tseem ceeb. Hauv lwm lo lus, qhov tsis muaj ib qho ntawm cov xwm txheej no yuav tsis ua rau hluav taws kub lossis tawg. Thaum cov roj hluav taws xob (steam, plua plav) thiab cov pa oxygen sib xyaw thiab ncav cuag ib qho concentration, lawv yuav tawg thaum raug hluav taws kub nrog qee qhov kub. Peb xa mus rau qhov concentration ntawm cov roj combustible tawg thaum raug hluav taws kub raws li qhov kev txwv ntawm qhov tawg, luv luv li qhov txwv tsis pub tawg, uas feem ntau qhia hauv%.
Qhov tseeb, qhov sib xyaw no tsis tas yuav tawg ntawm qhov sib tov sib xyaw thiab yuav tsum muaj qhov sib txawv. Qhov chaw ntxoov ntxoo qhia hauv daim duab ntawm sab xis saum toj no. Thaum lub concentration ntawm cov roj combustible qis dua LEL (tsawg kawg explosive txwv) (tsis txaus combustible gas concentration) thiab saum toj no UEL (qhov siab tshaj plaws tawg txwv) (tsis txaus oxygen), yuav tsis muaj tawg. Lub LEL thiab UEL ntawm cov roj hluav taws xob sib txawv sib txawv (saib cov lus qhia hauv qhov teeb meem thib yim), uas yuav tsum tau coj mus rau hauv tus account thaum ntsuas ntsuas ntsuas. Rau cov laj thawj kev nyab xeeb, feem ntau peb yuav tsum tau tshaj tawm lub tswb thaum lub siab ntawm cov roj hluav taws xob yog 10% thiab 20% ntawm LEL, qhov twg 10% LEL raug xa mus. Ua kev ceeb toom ceeb toom, thaum 20% LEL hu ua kev ceeb toom txaus ntshai. Yog vim li cas peb hu lub combustible gas detector LEL detector. Nws yuav tsum tau muab sau tseg tias 100% tso tawm nyob rau hauv lub LEL detector tsis qhia hais tias cov concentration ntawm combustible gas ncav cuag 100% ntawm cov roj ntim, tab sis mus txog 100% ntawm LEL, uas yog sib npaug rau qhov tsawg tshaj plaws tawg txwv ntawm combustible gas. Yog tias nws yog methane, 100% LEL=4% ntim concentration (VOL). Hauv kev ua haujlwm, tus ntes uas ntsuas cov pa roj no siv LEL txoj kev yog ib qho khoom siv hluav taws xob sib xyaw ua ke.
Nws lub hauv paus ntsiab lus yog tus choj dual (feem ntau hu ua Wheatstone choj) nrhiav kom pom. Cov tshuaj catalytic combustion yog coated ntawm ib qho ntawm cov platinum hlau txuas hniav. Txawm hais tias cov roj hluav taws xob tsis zoo, tsuav nws tuaj yeem raug hluav taws xob los ntawm electrode, qhov kev tiv thaiv ntawm platinum hlau choj yuav hloov vim qhov kub thiab txias. Qhov kev hloov pauv no yog qhov sib npaug rau qhov sib npaug ntawm cov roj hluav taws xob, thiab qhov concentration ntawm cov roj hluav taws xob tuaj yeem raug xam los ntawm qhov ntsuas qhov ntsuas hluav taws xob thiab microprocessor.
