Lub npe lus Askiv tag nrho ntawm LEL yog Lower Explosive Limit. Cov lus piav qhia Suav yog "Lower explosive limit". Nyob rau hauv ib tug combustible gas detector, LEL yog hais txog qhov tsawg tshaj plaws concentration ntawm combustible gas nyob rau hauv cov huab cua uas tawg thaum raug rau ib tug qhib nplaim taws, uas yog 100% LEL. Nws yog ib lo lus technical rau flammable gases.
Qhov ntau ntawm cov pa hluav taws xob dav dav yog 0 txog 100 feem pua LEL. Piv txwv li, "qis tawg txwv" ntawm hydrogen yog 4 feem pua ntawm qhov sib piv. Qhov ntawd yog hais tias, yog tias qhov 4 feem pua ntawm qhov sib piv tau muab faib ua 100 qhov sib npaug, qhov 4 feem pua ntawm qhov sib piv yog 100 feem pua LEL.
Thaum tus nqi ntawm cov combustible LEL EX Gas Detector mus txog 10% LEL tswb taw tes. Nws yog sib npaug rau cov ntsiab lus hydrogen nyob rau lub sijhawm no yog 0.4 feem pua ntawm ntim. Thaum tus nqi ntes mus txog 25% LEL tswb taw tes, nws yog sib npaug rau cov ntsiab lus hydrogen yog 1% los ntawm ntim rau lub sijhawm no. Lub sijhawm no, lub ntsuas hluav taws xob hluav taws xob tau tawm ntawm lub tswb.
Nws tsis yog hais tias qhov kev txwv qis dua tau mus txog, tab sis qhov kev ceeb toom uas cuam tshuam yuav tsum tau ua. Piv txwv li, ua ntej qhib lub kiv cua rau qhov cua, tom qab ntawd txiav tawm cov roj hluav taws xob valve thiab xyuas seb puas muaj cov pa hluav taws xob tawm. Kev ceeb toom ntxov yog qhov tsim nyog rau kev tswj xyuas raws sij hawm ntawm kev pheej hmoo tawg thiab tuaj yeem tiv thaiv kev poob ntawm lub neej thiab khoom vaj khoom tsev kom ntau li ntau tau.
Thaum qhov concentration ntawm cov pa taws kub hnyiab hauv huab cua mus txog nws qhov kev txwv qis dua, peb hais tias qhov kev phom sij tawg ntawm cov pa phem hauv qhov chaw no yog 100%, uas yog, 100% LEL. Piv txwv li, qhov qis dua qhov txwv ntawm methane yog 5% los ntawm ntim. Qhov ntawd yog hais tias, yog tias qhov no 5% los ntawm ntim tau muab faib ua ib puas qhov sib npaug, 5% los ntawm ntim sib raug rau 100% LEL. Qhov ntawd yog hais tias, thaum tus nqi ntes mus txog 10% LEL lub tswb, nws yog sib npaug rau cov ntsiab lus methane nyob rau lub sijhawm no yog 0.5% los ntawm ntim. Thaum tus nqi ntes mus txog 25% LEL lub tswb, nws yog sib npaug rau cov ntsiab lus methane yog 1.25% los ntawm ntim rau lub sijhawm no.
Yog hais tias cov ntsiab lus ntawm cov pa hluav taws xob tsuas yog nce mus txog 10% ntawm nws qhov kev txwv qis dua, peb hais tias qhov kev puas tsuaj ntawm cov pa taws kub hnyiab hauv qhov chaw no yog 10% LEL. Kev saib xyuas cov pa hluav taws xob hauv cov huab cua puag ncig feem ntau ncaj qha muab qhov kev phom sij ntawm ib puag ncig ntawm cov pa hluav taws xob, uas yog qhia raws li feem pua ntawm cov ntsiab lus ntawm cov pa hluav taws xob hauv huab cua rau nws qhov kev txwv qis dua: [% LEL]; Yog li ntawd, kev soj ntsuam zoo li no qee zaum kuj hu ua "explosion detection", thiab cov cuab yeej saib xyuas siv kuj hu ua "explosion detectors" lossis combustible gas detectors.