Dab tsi yog "PPM" thiab "LEL" hauv gas detector?
Peb feem ntau pom "PPM" thiab "LEL" ntawm lub ntsuas roj, yog li "PPM" thiab "LEL" yog dab tsi? Tej zaum ntau tus neeg tsis paub meej. Cov nram qab no plaub-hauv-ib lub ntsuas roj yuav qhia cov ntsiab lus tshwj xeeb ntawm ob lo lus no kom ntxaws.
PPM "yog qhov tshwj xeeb concentration los ntawm ntim." PPM yog ib tug sawv cev ntawm kev daws concentration, thiab PPM txhais tau tias ib tug ntawm ib lab. Rau kev daws: uas yog, muaj 1/1000 ml solute nyob rau hauv 1 liter dej, thiab nws cov concentration. Cov pa roj yog 1 PPM rau cov pa roj: ib txoj hauv kev los qhia qhov concentration ntawm cov pa phem nyob rau hauv lub ambient cua. Volume concentration sawv cev: Lub ntim ntawm cov pa phem muaj nyob rau hauv ib lab ntim ntawm huab cua yog PPM, thiab cov roj concentration ntsuas los ntawm feem ntau gas detection. Cov twj paj nruag yog PPM.Txawm li cas los xij, raws li Tuam Tshoj txoj cai, tshwj xeeb tshaj yog lub tuam tsev tiv thaiv ib puag ncig, cov roj concentration yuav tsum tau qhia nyob rau hauv chav nyob ntawm huab hwm coj concentration, thiab peb lub teb chaws cov qauv thiab specifications kuj tau qhia nyob rau hauv units ntawm huab hwm coj concentration. siv lub hauv paus ntsiab lus hais tias cov conductivity ntawm ib co hlau oxide semiconductor cov ntaub ntawv hloov nrog cov kev hloov ntawm ib puag ncig gas muaj pes tsawg leeg ntawm ib tug tej yam kub.
"LEL" yog hais txog qhov kev txwv qis dua. Qhov qis tshaj plaws ntawm cov pa roj combustible uas tawg thaum raug hluav taws kub hauv huab cua yog hu ua qhov txwv tawg qis- feem pua LEL luv luv.
Tsau VOC Gas Detector
Qhov siab tshaj plaws ntawm cov roj combustible uas tawg thaum nws ua tau raws li hluav taws kub hauv huab cua yog hu ua qhov txwv siab tshaj ntawm kev tawg- feem pua UEL luv luv. 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 yuav kub hnyiab los yog tawg tsuas yog thaum nws tov nrog huab cua los ua ib tug sib tov los yog, ntau precisely, thaum nws ua tau raws li oxygen los tsim ib tug tej yam kev faib ua feem ntawm cov sib tov. Cov tub ceev xwm thiab cov kws tshaj lij tau ua qhov kev ntsuam xyuas ntawm kev sib tsoo thiab tawg ntawm cov pa hluav taws xob pom tam sim no, thiab ua haujlwm tawm qhov txwv kev tawg ntawm cov pa hluav taws xob. Hauv qab qhov kev txwv qis qis, cov roj combustible hauv cov roj sib xyaw tsis txaus ua rau combustion lossis tawg, thiab cov ntsiab lus oxygen hauv cov roj sib xyaw saum toj kawg nkaus txwv tsis txaus ua rau combustion lossis 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 los ntawm qhov ntim feem pua ntawm cov concentration. Qhov kev txwv tsis pub tawg yog lub hauv paus ntawm qhov kev txwv qis qis thiab qhov txwv tsis pub tawg. Qhov concentration ntawm cov roj combustible nyob rau hauv cov huab cua tsuas yog tawg ntawm qhov qis 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, nyob rau hauv qhov kev ntsuas tawg, lub tswb concentration yog feem ntau teem rau hauv qab 25 feem pua LEL ntawm qhov tsawg tawg txwv. Kev ntsuas ntau ntawm ntau yam khoom siv hluav taws xob hluav taws xob yog 0-100 feem pua LEL. Lub ntsuas hluav taws xob ruaj khov feem ntau muaj ob lub tswb ceeb toom: 10 feem pua LEL yog thawj lub tswb thiab 25 feem pua LEL yog lub tswb thib ob. Portable combustible gas detector feem ntau muaj lub tswb taw tes: 25 feem pua LEL yog lub tswb.
Piv txwv li, qhov kev txwv qis ntawm methane yog 5 feem pua ntawm qhov ntim, uas yog hais tias, faib qhov no 5 feem pua ntawm qhov ntim rau hauv 100 qhov sib npaug, yog li ntawd 5 feem pua ntawm qhov ntim sib haum rau 100 feem pua LEL, uas yog, thaum tus nqi ntes mus txog lub tswb taw tes ntawm 10 feem pua LEL, nws yog sib npaug rau cov ntsiab lus methane ntawm 0.5 feem pua ntawm qhov ntim ntawm lub sijhawm no. Thaum tus nqi ntes mus txog lub tswb ceeb toom ntawm 25 feem pua LEL, nws yog sib npaug rau cov ntsiab lus methane ntawm 1.25 feem pua ntawm qhov ntim.
Yog li ntawd, koj tsis tas yuav txhawj xeeb txog seb puas muaj kev phom sij thaum twg los tau tom qab lub tswb. Lub sijhawm no, koj raug ceeb toom 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 los ntawm qhov kev txwv qis qis uas muaj qhov muaj peev xwm txaus ntshai, yog li ua lub luag haujlwm ntawm lub tswb nrov. Tau kawg, koj yuav tsum tau siv cov kev tiv thaiv thiab xyuas cov cuab yeej hauv lub sijhawm tom qab ntawd kom pom tias nws xav tau calibration.
