Dab tsi yog qhov ntsuas roj ntsuas LEL feem pua / VOL feem pua thiab ppm nyeem ntawv txhais li cas
Nrog rau txoj kev loj hlob ntawm kev tshawb fawb thiab thev naus laus zis, cov cuab yeej hluav taws xob tau siv dav hauv kev ua haujlwm niaj hnub hauv petrochemical, tshuaj tsim khoom, kev lag luam tshuaj thiab microbiological, txawm tias nws yog txhawm rau txheeb xyuas cov roj concentration lossis roj muaj pes tsawg leeg, lossis txhawm rau txheeb xyuas cov pa microleakage. Ib qho yooj yim-rau-siv roj ntes tau tuaj yeem muab qhov chaw nyab xeeb rau peb cov khoom thiab lub neej. Thaum peb siv lub tshuab ntsuas roj txhua hnub, qhov kev tshawb nrhiav ntau yam ntawm cov kua siv lead ua kua ntawm lub tshuab ntsuas roj feem ntau tshwm sim 0-100LEL feem pua lossis 0-2000ppm, thiab lwm yam. cov lus zoo sib xws, lossis ntawm lub vijtsam LCD ntawm cov pa roj detector, kuj Cov lus VOL feem pua los yog ppm yuav tshwm sim, yog li peb cov chav no txhais li cas thiab lawv hloov siab los ntseeg li cas, kuv yuav muab cov lus qhia ntxaws ntxaws rau koj hnub no.
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 raws li 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 txhais tau hais tias qhov ntim ntawm methane hauv huab cua yog 5 feem pua. Ntau qhov kev tshawb pom ntau ntawm peb cov roj ntes tau qhia hauv VOL feem pua. Piv txwv li, qhov kev tshawb pom ntau yog 0-100 feem pua VOL, uas txhais tau hais tias thaum lub ntsuas roj no ntes tau qee yam roj, nws tuaj yeem ntes nws hauv huab cua. Qhov feem pua ntau yog 0-100 feem pua . Peb kuj tuaj yeem teeb tsa VOL ntawm qee qhov feem pua tus nqi 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 (tsawg dua kev txwv)
Peb tau qhia txog cov roj combustible ua ntej. Lub tswv yim ntawm cov roj combustible txhais tau hais tias nws tuaj yeem sib xyaw nrog huab cua (lossis oxygen) nyob rau hauv ib qho kev concentration ntau los tsim cov roj premixed. Nws yuav tawg thaum ntsib qhov hluav taws kub. Tom qab ntawd, cov roj hluav taws xob no tuaj yeem ua tau Qhov qis tshaj qhov ntim feem pua ntawm cov khoom tawg, uas yog, qhov qis qis qis ntawm cov pa tawg yog LEL feem pua, uas yog hu ua qis qis ntawm kev tawg. Nws chav tsev kuj yog ib feem pua, uas yog, qhov qis tawg txwv yog muab faib ua ib puas feem, ib chav tsev yog 1LEL feem pua, thiab cov concentration ntawm cov roj ntim nyob rau hauv qis tawg txwv yog qhia los ntawm VOL feem pua.
3. PPM (ib lab ntawm cov roj ntim feem pua)
Lub tswv yim ntawm PPM zoo ib yam li VOL, tshwj tsis yog tias PPM sawv cev rau ib lab ntawm cov roj ntim. Piv txwv li, 10ppm carbon dioxide txhais tau hais tias huab cua muaj 10 feem ntawm ib lab carbon dioxide. Txij li lub tsev PPM yog chav tsev tsis muaj qhov dav, loj Qee lub tshuab ntsuas roj uas tuaj yeem kuaj pom cov qib PPM yog siv los kuaj xyuas cov pa micro-kua pa hauv qhov chaw ua haujlwm, vim tias cov pa micro-kua pa yog qhov txaus ntshai heev, thiab cov pa roj micro-tawm mus ntev yuav ua rau Cov xwm txheej loj, yog li peb yuav tsum siv PPM-theem gas detectors yog siv los tshem tawm cov dej tawm hauv lub sijhawm.
4. Kev hloov pauv ntawm VOL feem pua, LEL feem pua, thiab PPM
Thawj yog qhov hloov dua siab tshiab ntawm VOL thiab PPM. Kev hloov pauv ntawm ob chav nyob no kuj yooj yim, vim tias feem pua VOL yog feem pua ntawm qhov ntim, thiab PPM yog feem pua ntawm ntim ib lab, yog li 1 feem pua (VOL)=10000PPM.
Rau kev hloov dua siab tshiab ntawm VOL thiab LEL, peb yuav tsum nrhiav kom paub qhov qis qis ntawm qhov tawg ntawm cov roj combustible. Thaum lub concentration ntawm cov roj combustible nyob rau hauv cov huab cua mus txog qhov tsawg kawg nkaus txwv ntawm qhov tawg, peb hu ua explosion txaus ntshai ntawm combustible gas ib puag ncig nyob rau hauv qhov chaw no. Piv txwv li, LEL ntawm hydrogen yog 4 feem pua VOL, uas yog, thaum nws qhov ntim feem pua hauv huab cua mus txog 4 feem pua VOL, nws yuav tawg thaum nws ntsib cov nplaim taws. Yog li ntawd, 4 feem pua VOL yog suav tias yog 100 feem pua kev phom sij, uas yog hu ua 100 feem pua LEL, uas 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 muaj txoj hauv kev ncaj qha los hloov ob qho no, koj yuav tsum xub hloov LEL rau VOL, thiab tom qab ntawd hloov VOL rau PPM. Ntawm no yog cov qauv rau txhua tus, PPM= feem pua LEL × LEL(vol feem pua) × 100, noj methane ua piv txwv, pes tsawg PPM yog 20 feem pua LEL ntawm methane, raws li cov qauv kev suav: 20 (%) ) × 1 (%) × 100=2000PPm. Feem ntau hais lus, cov khoom siv roj ntsha uas tuaj yeem ntes PPM yog cov khoom siv hluav taws xob zoo heev, thiab cov khoom siv roj ntsha ntawm LEL feem ntau yog siv rau hauv kev tshawb nrhiav tawg. Qhov kev txiav txim ntawm qhov loj ntawm VOL yog qhov loj tshaj plaws ntawm lawv, thiab nws kuj tseem siv tau. 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.
