Cov units ntawm lub ntsuas roj txhais li cas rau kuv?
Gas detector yog ib qho ntawm cov cuab yeej tshawb nrhiav feem ntau siv hauv kev tsim khoom. Nws tuaj yeem tshawb xyuas qhov concentration ntawm cov tshuaj lom thiab teeb meem ntawm kev ua haujlwm, kuaj xyuas cov pa roj carbon monoxide hauv ib puag ncig, thiab siv cov cuab yeej tiv thaiv kev nyab xeeb raws li cov txiaj ntsig tshawb pom. Tab sis thaum siv lub tshuab ntsuas roj, ntau tus neeg tsis paub tias cov chav nyob ntawm lub ntsuas roj txhais li cas.
Cov units ntawm lub ntsuas roj txhais li cas?
(1)% VOL (gas concentration volume ratio): xyuas cov pa oxygen thiab carbon dioxide. Siv chav tsev no, tus nqi tuaj yeem nyeem ncaj qha.
(2) %LEL (qis tawg txwv): yog hais txog qhov qis tshaj plaws ntawm qhov kev tawg tshwm sim thaum cov roj hluav taws xob sib xyaw nrog huab cua thiab ntsib qhov hluav taws xob tsawg kawg nkaus.
Portable gas detectors feem ntau teeb tsa lub tswb ceeb toom: qis dua 25% LEL ntawm qhov kev txwv qis dua.
Piv txwv li, qhov kev txwv qis qis ntawm methane yog 5% VOL, uas yog, yog tias 5% VOL muab faib ua ib puas qhov sib npaug, nws sib raug rau 100% LEL. Thaum tus nqi ntes mus txog 25% LEL lub tswb taw tes, nws yog sib npaug rau qhov concentration ntawm methane nyob rau lub sijhawm no yog 5%VOL * 25%=1.25%VOL.
Nws tseem nyob deb ntawm qhov qis qis ntawm methane tawg ntawm 5% VOL, yog li tsis tas yuav txhawj xeeb txog qhov txaus ntshai tom qab hu lub tswb. Qhov no tsuas yog qhia koj kom ua raws li cov kev ntsuas tam sim.
Xws li kaw li qub, dispersing gas, thiab lwm yam., uas yog lub tswb ceeb toom. Yog tias tus nqi nce mus txog 100% LEL, koj yuav tsum tau them sai sai rau lub sijhawm no, qhia tias qhov qis qis ntawm methane tawg concentration ntawm 5% tau mus txog, uas yog qhov txaus ntshai heev.
(3) PPM: PPM yog cov ntawv luv ntawm ib feem ntawm ib lab hauv lus Askiv, uas txhais tau tias feem ntawm ib lab. Volume concentration (ppm) txhais tau hais tias qhov ntim ntawm cov pa phem muaj nyob hauv ib lab ntim ntawm huab cua.
Peb lub teb chaws cov qauv thiab cov kev qhia tshwj xeeb kuj tau hais nyob rau hauv cov chav loj loj (xws li mg / m3).
