Dab tsi yog lub ntsiab lus ntawm LEL feem pua / VOL feem pua thiab ppm hauv cov khoom siv roj
Nrog rau txoj kev loj hlob ntawm thev naus laus zis, cov khoom siv roj av tau siv dav hauv kev lag luam xws li petrochemical, tshuaj tsim khoom, tshuaj microbiology, thiab lwm yam. Txawm hais tias nws kuaj pom cov roj concentration, roj muaj pes tsawg leeg, lossis roj micro leaks, tus neeg siv khoom siv hluav taws xob tuaj yeem muab tau muaj kev nyab xeeb ib puag ncig rau peb ntau lawm thiab lub neej. Thaum peb siv cov cuab yeej ntsuas roj hauv lub neej niaj hnub, qhov kev tshawb nrhiav ntau yam ntawm cov kua siv lead ua kua ntawm lub ntsuas roj feem ntau tshwm nrog cov lus xws li 0-100LEL feem pua lossis 0-2000ppm, lossis cov lus VOL feem pua lossis ppm kuj tshwm sim ntawm cov kua siv lead ua kua zaub screen ntawm cov roj ntes. Yog li, dab tsi yog lub ntsiab lus tshwj xeeb ntawm peb chav nyob thiab lawv hloov siab los ntseeg li cas? Hnub no, peb yuav muab cov ncauj lus qhia ntxaws ntxaws rau koj.
1, VOL feem pua (gas ntim feem pua)
VOL yog ib chav tsev ntawm lub cev uas piav qhia txog qhov ntim ntawm cov pa thiab qhia tias feem pua. Nws yog qhov feem pua ntawm qhov ntim ntawm cov pa tshwj xeeb hauv huab cua. Piv txwv li, 5 feem pua VOL methane sawv cev rau 5 feem pua ntawm qhov ntim ntawm methane hauv huab cua. Peb lub ntsuas roj ntsuas qhov ntsuas tau feem ntau qhia txog VOL feem pua. Piv txwv li, qhov kev tshawb pom ntau yog 0-100 feem pua VOL, uas txhais tau hais tias thaum kuaj pom cov pa roj, qhov ntsuas roj no tuaj yeem ntes tau qhov feem ntau ntawm 0-100 feem pua hauv huab cua. Peb kuj tuaj yeem teeb tsa tus nqi feem pua ntawm VOL raws li lub tswb. Thaum cov ntsiab lus ntawm qee yam roj mus txog lossis tshaj qhov teeb tsa no, lub ntsuas roj yuav ceeb toom. Qhov no suav nrog lwm chav, LEL feem pua.
2, LEL feem pua (qis dua qhov txwv)
Peb twb tau qhia yav dhau los lub tswv yim ntawm cov roj combustible, uas yog hais txog lub peev xwm los sib xyaw ua ke nrog huab cua (lossis oxygen) nyob rau hauv ib qho kev concentration ntau los tsim cov roj premixed. Thaum ntsib qhov hluav taws kub, nws yuav tawg. Yog li ntawd, qhov tsawg kawg nkaus qhov feem pua concentration uas cov roj combustible no tuaj yeem detonate nyob rau hauv cov huab cua, uas yog qhov peb hu ua qhov qis explosive concentration ntawm cov pa, LEL feem pua, los yog tsuas yog qhov tsawg explosive txwv. Nws chav kuj tseem yog ib feem pua, uas faib cov kev txwv qis qis rau hauv 100 qhov chaw, nrog rau chav tsev ntawm 1LEL feem pua. Qhov concentration ntawm cov roj ntim hauv qhov qis qis yog qhia hauv VOL feem pua.
3, PPM (ib feem ntawm ib lab los ntawm ntim roj)
Lub tswv yim ntawm PPM zoo ib yam li VOL, tshwj tsis yog tias PPM sawv cev rau ib lab ntawm qhov ntim ntawm cov roj. Piv txwv li, 10ppm carbon dioxide hais txog 10 feem ntawm ib lab ntawm cov pa roj carbon dioxide hauv huab cua. Txij li cov PPM cov chav nyob tsis muaj qhov loj, feem ntau cov khoom siv roj ntsha uas tuaj yeem ntes PPM qib yog siv los kuaj xyuas cov pa roj micro hauv qhov chaw ua haujlwm, vim tias cov pa roj micro leaks yog qhov txaus ntshai heev, Lub sij hawm ntev roj micro leaks yuav ua rau muaj xwm txheej loj, yog li peb yuav tsum siv PPM. qib roj detectors kom sai tshem tawm cov cheeb tsam ntawm micro leaks.
4, Kev hloov pauv ntawm VOL feem pua, LEL feem pua, thiab PPM
Ua ntej, kev hloov pauv ntawm VOL thiab PPM yog qhov yooj yim, raws li feem pua VOL yog feem pua ntawm cov ntim thiab PPM yog ib feem ntawm ib lab ntawm cov ntim, yog li 1 feem pua (VOL)=10000PPM.
Txhawm rau hloov VOL thiab LEL, peb yuav tsum xub nrhiav kom paub qhov qis qis ntawm cov pa roj combustible. Thaum lub concentration ntawm combustible gas nyob rau hauv cov huab cua mus txog nws qis explosive txwv, peb hu lub explosion kev pheej hmoo ntawm combustible gas ib puag ncig nyob rau hauv qhov chaw no 100 feem pua. Piv txwv li, LEL ntawm hydrogen yog 4 feem pua VOL, uas txhais tau hais tias thaum lub ntim feem pua ntawm cov huab cua mus txog 4 feem pua VOL, nws yuav tawg thaum raug nplaim taws. Yog li ntawd, xav txog 4 feem pua VOL raws li 100 feem pua kev puas tsuaj, nws yog hu ua 100 feem pua LEL, Yog 4 feem pua VOL=100 feem pua LEL, ces 1 feem pua VOL=25 feem pua LEL.
Kev hloov pauv ntawm PPM thiab LEL tsis tuaj yeem hloov pauv ncaj qha. Koj yuav tsum xub hloov LEL rau VOL, thiab tom qab ntawd hloov VOL rau PPM. Ntawm no yog ib qho qauv, PPM= feem pua LEL × LEL (vol feem pua) × 100, noj methane ua piv txwv, PPM ntawm 20 feem pua LEL methane yog dab tsi? Raws li cov qauv kev suav, nws tuaj yeem tau txais raws li hauv qab no: 20 (feem pua LEL) × 1 (%) × 100=2000PPm. Feem ntau hais lus, cov khoom siv hluav taws xob uas tuaj yeem ntes PPM yog qhov tseeb heev, thaum LEL roj ntes tau feem ntau yog siv rau hauv cov xwm txheej sim tawg, thiab qhov kev txiav txim ntawm qhov loj ntawm VOL yog qhov loj tshaj plaws ntawm lawv, uas yog feem ntau siv. Peb paub zoo txog qhov peb pawg no sawv cev thiab lawv cov kev hloov pauv, uas tuaj yeem pab peb xaiv thiab siv lub ntsuas roj zoo dua.
