Peb feem ntau pom "PPM" thiab "LEL" ntawm lub tshuab kuaj pa, yog li "PPM" thiab "LEL" yog dab tsi?
"PPM" yog qhov kev tshwj xeeb los ntawm ntim, "PPM" yog ib qho sawv cev ntawm qhov kev txiav txim siab ntawm kev daws; PPM yog ib feem ntawm ib lab.
Rau qhov kev daws teeb meem: uas yog 1 / 1000ml ntawm solute hauv kev daws ntawm 1 liter dej, qhov siab yog 1 PPM.
Rau roj cua: ib qho sawv cev ntawm cov kev nkag siab ntawm cov pa phem nyob rau hauv qhov chaw huab cua. Qhov ntau thiab tsawg: cov pa phem nyob hauv ntau lab ntawm cov huab cua los ntawm ntim, lossis feem rau ib lab. Cov pa roj ntsuas los ntawm feem ntau ntawm cov pa ntsuas qhov ntsuas yog qhov ntim concentration (PPM), thiab raws li cov kev cai hauv Suav teb, tshwj xeeb tshaj yog kev tiv thaiv ib puag ncig, kev lag luam roj yuav tsum tau tshaj tawm nyob rau hauv chav ntsuas ntawm qhov ntau pawg, peb lub teb chaws tus qauv yog kuj qhia nyob rau hauv chav tsev ntawm qhov loj mloog. Nws yog siv qee cov hlau oxide semiconductor cov ntaub ntawv, ntawm qhov kub thiab txias, kev coj pauv hloov pauv nrog cov nyob ntawm cov khoom pauv hloov hauv cov roj.
LEL "yog qhov qis tshaj. Qhov siab tshaj plaws ntawm qhov sib tov ntawm cov pa roj, hluav taws, lossis hmoov av thiab cua tuaj yeem tawg thaum tiv thaiv qhov hluav taws xob yog hu ua qhov qis qis ntawm kev tawg, lossis LEL. Zoo sib xws, qhov siab tshaj plaws ntawm qhov sib tov ntawm cov pa sib tov. vapor, roj lossis hmoov av thiab huab cua tuaj yeem tawg tau thaum nws ntsib qhov hluav taws qhov hluav taws xob hu ua qhov chaw siab tshaj qhov tawg, lossis UEL rau qhov luv luv. Yog li ntawd dab tsi qis dua?
Nws tsis txaus ntshai yog tias qhov kev sib txuam ntawm cov roj sib xyaw yog tsawg dhau lossis siab dhau. Nws tuaj yeem tsuas hlawv lossis tawg thaum nws sib xyaw nrog huab cua los tsim kev sib xyaw, tshwj xeeb dua, thaum nws tau sib xyaw nrog qee qhov sib luag nrog cov pa. Tawg tawg ntawm cov pa nkev tau tsim los ntawm lub xeev raws li cov ntaub ntawv ntsuas muaj feem xyuam. Thaum cov roj sib kis tau qis dua qhov qis dua qhov tawg, tsis muaj cov pa roj uas txaus sib xyaw hauv qhov sib xyaw kom ua rau cov pa taws lossis tawg, thiab tsis muaj cov pa oxygen txaus nyob rau hauv qhov sib tov sib xyaw sab saud sab saud los ua kom sib txuas lossis tawg. Tsis tas li ntawd, kev sib txuas thiab kev tawg ntawm cov pa roj uas sib txuas tau tseem cuam tshuam txog cov pa roj, qhov kub, qhov cub lub zog thiab lwm yam. Qhov kev tso tawm ntawm qhov tawg feem ntau yog qhia ua feem pua ntawm cov khoom ntim.
Qhov kev txwv ntawm qhov tawg yog tias cov khoom siv hluav taws xob (cov roj sib kis, cov pa thiab hmoov av) thiab huab cua (lossis oxygen) yuav tsum tau sib xyaw kom zoo nyob hauv qee qhov kev nkag siab los ua cov roj premixed, uas tsuas tuaj yeem tshwm sim thaum muaj hluav taws. Qhov siab ntawm lub zog no yog hu ua qhov chaw tawg, lossis lub peev txheej tawg. Sab sauv loj ntawm kev tawg ntxiv rau qis tshaj qhov tawg yog qhov khoom tawg. Qhov kev kub siab ntawm cov pa roj hauv huab cua tsuas yog tshwm sim ntawm thaj chaw qis dua ntawm qhov tawg thiab qhov chaw sab sau siab ntawm qhov tawg. Tsis muaj qhov tawg yuav tshwm sim hauv qis dua qis dua lossis siab dua toj siab. Yog li ntawd, nyob rau hauv kev ntsuas qhov tawg, lub tswb nrov feem ntau raug teeb tsa qis dua 25% LEL ntawm qhov qis dua qhov tawg, thiab ntsuas ntau ntawm cov ntsuas hluav taws roj yog 0-100% LEL.
Piv txwv li, qhov pib tawg qis dua rau methane yog 5% ntim piv. Ntawd yog, yog tias koj faib 5% ntim piv rau 100 qhov sib npaug, qhov 5% ntim sib piv ua rau 100% LEL. Thaum lub ntsuas ntes tau nce mus txog 10% LEL lub tswb taw tes, cov ntsiab lus methane yog li 0.5% ntim piv. Thaum lub ntsuas ntes tau nce mus txog 25% LEL lub tswb taw tes, cov ntsiab lus methane yog sib npaug rau 1.25% ntim piv. Yog li, koj tsis tas yuav txhawj xeeb txog qhov phom sij tom qab lub tswb nrov, qhov no yog qhov tshwm sim rau koj, kom ua raws li cov kev ntsuas tau tam sim ntawd, xws li qhib lub kiv cua tso pa lossis txiav tawm qee qhov qub, los ntawm qhov muaj qhov txaus ntshai qis dua qhov tawg tseem muaj kev deb, yog li ua lub luag haujlwm ntawm lub tswb ceeb toom.