Cov khoom siv hluav taws xob hluav taws xob (LEL gas detector) lom tshwm sim thaum lub ntsuas hluav taws xob tseem ceeb (feem ntau yog catalytic combustion sensor) irreversibly puas los ntawm tej yam khoom, uas ua rau ib tug mus tas li txo nyob rau hauv rhiab heev los yog ua tsis tiav.
Qhov no zoo ib yam li tus neeg lub siab olfactory puas los ntawm cov tshuaj muaj zog, ua rau lawv tsis hnov tsw tsw.
1. Lub hauv paus ntsiab lus: Catalytic combustionhom roj sensor, LEL gas sensor
Cov pa hluav taws xob ntau tshaj plaws (siv los ntes cov methane, propane, hydrogen, thiab lwm yam) yog lub ntsuas hluav taws xob catalytic. Nws cov khoom tseem ceeb muaj xws li "sensing element" (feem ntau yog nyias platinum hlau coil coated nrog cov catalyst (xws li palladium los yog platinum) thiab cov khoom nqa khoom) thiab "cov khoom siv nyiaj" uas ua haujlwm raws li kev siv.
Thaum cov roj combustible diffuses mus rau saum npoo ntawm lub ntsiab lus, lub catalyst ua rau cov pa hluav taws kub hnyiab -tsawg combustion (catalytic combustion) ntawm qhov kub thiab txias tshaj nws qhov qub ignition point.Cov cua kub uas tsim los ntawm combustion ua rau platinum hlau coil tsis kam hloov. Lub Circuit Court ntsuas qhov kev hloov pauv no los xam cov concentration ntawm cov roj combustible.
2. Ua li casEX Gas Detectortshuaj lom tshwm sim?
Cov tshuaj lom tshuaj tua kab mob thiab rhuav tshem cov catalyst ntawm lub ntsiab lus.
Cov tshuaj lom mus tas li: Qee yam tshuaj (xws li silane, hydrogen sulfide, thiab halogen compounds) hnov mob hnyav thiab irreversibly nrog cov catalyst, tsim tshiab, inactive compounds uas tas mus li npog los yog hloov cov catalyst nto. Thaum muaj tshuaj lom, lub sensor tsis tuaj yeem ua kom muaj txiaj ntsig zoo rau kev sib xyaw ntawm cov pa roj carbon monoxide, thiab rhiab heev tuaj yeem poob qis lossis txawm tias mus txog xoom.
Cov tshuaj lom ntau: Silicon- muaj cov khoom sib txuas (xws li silicone sealant volatiles, hairspray, thiab lubricants), sulfides (xws li hydrogen sulfide, uas tsw tsw zoo li qe lwj), lead- muaj cov tshuaj (xws li cov roj ua kua roj), thiab phosphate esters.
Kev tiv thaiv ib ntus: Qee yam tshuaj (xws li cov ntsiab lus siab ntawm halogenated hydrocarbons) tuaj yeem nyob ib ntus ntawm cov chaw nquag ntawm cov catalyst, tiv thaiv cov roj uas tsis muaj hluav taws xob los ntawm kev sib cuag nrog lawv. Yog hais tias cov tshuaj inhibitory concentration tsawg thiab raug luv luv, sensor kev ua tau zoo yuav rov qab maj mam tom qab tshem tawm. Txawm li cas los xij, yog tias qhov kis tau ntev thiab cov concentrations siab, inhibition tuaj yeem ua rau muaj kev lom mus tas li.
Feem ntau inhibitors: Qee cov tshuaj ntxuav tu (xws li trichloroethylene), cov tub yees, thiab cov nplaim hluav taws.
3. Cov tsos mob ntawm "kev lom zem"
(1). Slowed Teb: EX sensor reacts qeeb dua rau tib lub roj concentration.
(2). Txo rhiab heev: Lub sensor nyeem ntawv qis dua. Piv txwv li, nyob rau hauv ib puag ncig uas muaj cov txheej txheem concentration ntawm cov pa ntsuas, qhov kev nyeem ntawv tau qis dua qhov xav tau.
(3). Tsis Teb Chaws: Lub LEL sensor qhia tsis muaj lus teb txhua, txawm tias nyob hauv ib puag ncig uas muaj cov pa roj ntau ntau.
(4). Calibration Failure: Lub EX sensor tsis tuaj yeem calibrated siv cov txheej txheem calibration ib txwm.
4. Yuav tiv thaiv li casLELSensor Poisoning?
(1). Nkag siab txog ib puag ncig: Txheeb xyuas cov tshuaj uas lub sensor tuaj yeem raug thiab tsis txhob siv cov txheej txheem catalytic combustion sensors hauv ib puag ncig uas muaj cov tshuaj lom.
(2). Siv Lub Cev Barrier: Nruab ib qho tshuaj tiv thaiv- lim tshuaj lom (xws li PTFE membrane) nyob rau hauv pem hauv ntej ntawm qee lub sensors. Qhov no tuaj yeem thaiv qhov loj ntawm silicone molecules thiab lwm yam tshuaj, tab sis nws tsis tuaj yeem tiv thaiv tag nrho cov tshuaj lom.
(3). Xaiv cov tshuaj lom-cov tshuaj tiv thaiv: Rau kev lag luam tshwj xeeb (xws li kev kho dej khib nyiab thiab cov nroj tsuag tshuaj), tshwj xeeb tsim tshuaj lom- cov tshuaj tiv thaiv muaj nyob. Cov sensors no siv cov catalysts tshwj xeeb lossis cov thev naus laus zis tiv thaiv, ua rau lub neej ntev dua.
(4). Kev tshuaj xyuas thiab ntsuas ntsuas tsis tu ncua: Kev ntsuas tsis tu ncua thiab ntsuas cov ntsuas ntsuas siv cov pa roj carbon monoxide raws li cov chaw tsim khoom cov lus pom zoo yog tib txoj kev txhim khu kev qha los kuaj xyuas qhov kev ua haujlwm tsis zoo (xws li kev lom lom).
(5). Kev txhim kho kom zoo**: Tsis txhob teeb tsa cov sensors ze rau qhov muaj peev xwm ntawm cov tshuaj lom tso tawm (xws li lub qhov cua qhov qhib, qhov chaw uas siv silicone sealant, los yog ze ntawm lub tsheb tso pa hauv qhov chaw nres tsheb).