Dab tsi yog "PPM" thiab "LEL" hauv cov khoom siv roj
Peb feem ntau pom "PPM" thiab "LEL" cim rau ntawm lub ntsuas roj, yog li dab tsi yog "PPM" thiab "LEL", tej zaum muaj coob tus neeg tsis paub meej, cov nram qab no plaub-hauv-ib roj ntes rau txhua tus Cia peb qhia qhov tshwj xeeb lub ntsiab lus ntawm ob lo lus no nthuav dav.
"PPM" yog qhov ntim piv concentration. "PPM" yog ib txoj hauv kev qhia txog qhov concentration ntawm cov tshuaj, thiab PPM txhais tau tias ib lab. Rau cov tshuaj: uas yog, muaj 1/1000 ml ntawm cov kua nyob rau hauv 1 liter ntawm aqueous tov, thiab nws cov concentration yog 1 PPM. Rau cov pa roj: Ib txoj hauv kev los qhia qhov concentration ntawm cov pa phem nyob rau hauv qhov chaw ib puag ncig. Volume concentration qhia: qhov ntim ntawm cov pa phem uas muaj nyob rau hauv ib lab ntim ntawm huab cua, uas yog, PPM, cov roj concentration ntsuas los ntawm feem ntau gas detects instruments Nws yog qhov ntim concentration (PPM), thiab raws li cov kev cai ntawm peb lub teb chaws, tshwj xeeb tshaj yog lub tuam tsev tiv thaiv ib puag ncig, cov roj concentration yuav tsum tau qhia nyob rau hauv units ntawm huab hwm coj concentration, thiab cov qauv specifications ntawm peb lub teb chaws kuj qhia nyob rau hauv units ntawm loj concentration. Nws siv qee cov hlau oxide semiconductors Cov khoom siv yog tsim los ntawm lub hauv paus ntsiab lus hais tias cov hluav taws xob conductivity hloov nrog cov muaj pes tsawg leeg ntawm cov pa ambient ntawm ib tug tej yam kub.
"LEL" txhais tau hais tias txo qis kev txwv. Qhov qis tshaj plaws ntawm cov pa roj combustible nyob rau hauv cov huab cua thaum nws ntsib ib tug qhib hluav taws yog hu ua qhov tsawg explosion txwv-abbreviated li feem pua LEL.
Tsau VOC Gas Detector
Qhov siab tshaj plaws ntawm cov pa roj combustible nyob rau hauv cov huab cua thaum nws ntsib ib tug qhib hluav taws yog hu ua lub sab sauv txwv ntawm tawg - abbreviated li feem pua UEL. Yog li dab tsi yog qhov kev txwv qis dua? Yog hais tias qhov concentration ntawm cov roj combustible tsawg dhau los yog siab dhau, nws tsis txaus ntshai. Nws tsuas yog kub hnyiab los yog tawg thaum nws tov nrog huab cua los ua ib qho sib xyaw lossis ntau dua qhov tseeb thaum nws ntsib oxygen los ua ib qho kev faib ua feem ntawm kev sib xyaw. Cov tuam tsev muaj cai lij choj thiab cov kws tshaj lij tau txheeb xyuas qhov kev sib tsoo thiab tawg ntawm cov roj hluav taws xob uas tau pom los txog tam sim no, thiab tau tsim cov kev txwv tawg ntawm cov roj combustible, uas yog qis dua qhov kev txwv qis ntawm kev tawg. Cov ntsiab lus ntawm combustible gas nyob rau hauv qhov sib tov yog tsis txaus los ua combustion los yog tawg. Cov ntsiab lus ntawm cov pa oxygen nyob rau hauv cov kev txwv sab sauv yog tsis txaus ua rau combustion los yog tawg.
Tsis tas li ntawd, combustion thiab tawg ntawm combustible gas kuj muaj feem xyuam rau tej yam xws li roj siab, kub, thiab ignition zog. Qhov kev txwv tawg feem ntau yog qhia nyob rau hauv ntim feem pua concentration. Qhov txwv tsis pub tawg yog cov ntsiab lus dav dav rau qhov kev txwv qis qis thiab qhov txwv tsis pub tawg. Qhov concentration ntawm cov roj combustible nyob rau hauv cov huab cua yuav tsuas yog tawg thaum lub concentration ntawm cov combustible gas nyob nruab nrab ntawm qhov tsawg tawg txwv thiab lub siab tawg txwv. Tsis muaj qhov tawg yuav tshwm sim hauv qab qhov kev txwv qis qis lossis siab tshaj qhov txwv kev tawg.
Yog li ntawd, thaum ua qhov kev ntsuas tawg, lub tswb ntsuas feem ntau yog teeb tsa qis dua 25 feem pua LEL ntawm qhov txo qis qis. Kev ntsuas ntau ntawm ntau yam khoom siv hluav taws xob hluav taws xob yog 0-100 feem pua LEL. Cov khoom siv hluav taws xob ruaj khov feem ntau muaj ob lub tswb ceeb toom: 10 feem pua LEL yog thawj theem tswb, thiab 25 feem pua LEL yog lub tswb theem thib ob. Portable combustible gas detectors feem ntau muaj lub tswb taw tes: 25 feem pua LEL yog lub tswb taw tes.
Piv txwv li, qhov kev txwv qis qis ntawm methane yog 5 feem pua ntawm qhov sib piv, uas yog hais tias, faib qhov 5 feem pua ntawm qhov sib piv rau hauv ib puas qhov sib npaug, kom 5 feem pua ntawm qhov sib npaug sib npaug rau 100 feem pua LEL, uas yog, thaum tus nqi ntes mus txog 10 Thaum qhov feem pua ntawm LEL lub tswb tau ncav cuag, nws txhais tau tias cov ntsiab lus ntawm methane yog 0.5 feem pua ntawm ntim. Thaum tus nqi ntes mus txog 25 feem pua ntawm LEL lub tswb, nws txhais tau tias cov ntsiab lus methane yog 1.25 feem pua ntawm qhov ntim.
Yog li ntawd, koj tsis tas yuav txhawj txog seb puas yuav muaj kev phom sij thaum twg los tau tom qab lub tswb. Lub sijhawm no, nws tseem ceeb rau koj kom ua raws li cov kev ntsuas tam sim ntawd, xws li tig lub kiv cua los yog txiav tawm qee qhov li qub. Tseem muaj qhov sib txawv loj, yog li nws yuav ua lub luag haujlwm ntawm lub tswb ceeb toom. Tau kawg, kev tiv thaiv yuav tsum tau ua, thiab cov cuab yeej yuav tsum tau kuaj xyuas lub sij hawm tom qab qhov kev tshwm sim kom pom tias yuav tsum tau calibration.
