Dab tsi yog qhov concentration ntawm combustible gas alarm rau tswb?
1. Thawj theem ceeb toom tus nqi ntawm cov roj combustible yuav tsum tsawg dua los yog sib npaug li 25 feem pua LEL.
2. Kev teeb tsa tus nqi ntawm lub tswb thib ob rau cov roj hluav taws xob yuav tsum tsawg dua lossis sib npaug li 50 feem pua LEL.
3. Thawj-theem tswb teeb tus nqi rau linear combustible gas ntsuas yuav tsum yog 1LEL·m; Qhov thib ob-theem tswb teeb tus nqi yuav tsum yog 2LEL·m.
Ntawm lawv, LEL yog cov ntawv luv luv ntawm kev tawg qis hauv lus Askiv, uas txhais tau hais tias qhov qis tshaj qhov concentration ntawm qhov sib xyaw ntawm cov pa hluav taws xob, roj lossis plua plav thiab huab cua tuaj yeem tawg thaum nws ntsib qhov hluav taws kub (qhov concentration ntawm flammable vapor thiab roj yog xam. los ntawm volume ratio).
tus
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. Vim muaj huab cua ntau dua, feem ntau yog thaum saib xyuas cov pa tawm ntawm cov pa taws, nws yog qhov yuav tsum tau saib xyuas nws qhov ntim concentration tus nqi los ntawm qhov tsis tshua muaj siab mus rau qhov kev txwv qis tshaj plaws, uas yog, qhov ntsuas ntau yog 0 ~ 100% LE.
Qhov concentration tswb tus nqi ntawm cov pa taws yog feem ntau preset nyob rau hauv lub ntsuas. Raws li cov kev cai nyob rau hauv lub teb chaws tus qauv, tus nqi ntawm cov thawj-theem ceeb toom ntawm flammable roj yog tsis siab tshaj qhov tsawg tshaj plaws tawg txwv ntawm 25 feem pua LEL. Yog li ntawd, tus nqi tswb ntawm lub tswb ntsuas roj tau teev tseg hauv lub teb chaws tus qauv yog qhov txwv sab saud, tsuav yog nws tsis siab tshaj qhov txwv saum toj no, nws nyob hauv qhov tsim nyog. Ntawm chav kawm, los ntawm cov kws tshaj lij thiab cov tswv yim pom zoo, lub tswb ntsuas ntawm cov roj hluav taws xob yuav tsum tsis txhob qis dhau. Yog tias nws qis dhau lawm, lub tswb tsis tseeb yuav tshwm sim, vim tias qis dhau yuav cuam tshuam nrog kev tshawb pom qhov yuam kev. Raws li rau qhov tshwj xeeb tshaj plaws ntawm cov pa roj carbon monoxide txwv ntawm txhua cov pa hluav taws xob, koj tuaj yeem xa mus rau Cov Lus Qhia Ntxiv A hauv "GBT 50493-2019": Cov yam ntxwv ntawm cov roj hluav taws xob thiab cov vapors, uas tsis tsuas yog muaj cov khoom tawg ntau ntawm cov pa taws thiab vapors (V feem pua ) sab sauv thiab qis qis, tab sis kuj tsis muaj xws li boiling point, flash point, thiab vapor density.
