Cov units ntawm lub ntsuas roj txhais li cas?
(1) feem pua VOL (gas concentration volume ratio): xyuas cov pa oxygen thiab carbon dioxide, thiab siv chav tsev no los nyeem tus nqi ncaj qha.
(2) feem pua LEL (qis tawg txwv): yog hais txog qhov tsawg tshaj plaws concentration ntawm qhov kev tawg tshwm sim thaum cov roj combustible tov nrog huab cua thiab ntsib qhov tsawg kawg nkaus ignition zog.
Portable gas detectors feem ntau teeb tsa lub tswb ceeb toom: qis dua 25 feem pua LEL ntawm qhov txo qis qis.
Piv txwv li, qhov kev txwv qis qis ntawm methane yog 5 feem pua VOL, uas yog, 5 feem pua VOL muab faib ua ib puas qhov sib npaug, sib npaug rau 100 feem pua LEL. Thaum tus nqi ntes tau mus txog 25 feem pua ntawm LEL lub tswb taw tes, nws yog sib npaug rau qhov concentration ntawm methane nyob rau lub sijhawm no yog 5 feem pua VOL * 25 feem pua =1.25 feem pua VOL.
Tseem muaj txoj hauv kev ntev mus los ntawm 5 feem pua VOL, qhov qis qis ntawm methane tawg, yog li tsis txhob txhawj txog qhov txaus ntshai tom qab hu rau tub ceev xwm, qhov no tsuas yog ceeb toom kom ua raws li kev ntsuas tam sim ntawd.
Xws li kaw lub valve, dispersing cov pa roj, thiab lwm yam, uas ua lub luag hauj lwm ntawm lub tswb ceeb toom. Yog tias tus nqi nce mus txog 100 feem pua LEL, koj yuav tsum tau them sai sai rau lub sijhawm no, qhia tias koj tau mus txog tus nqi ntawm 5 feem pua ntawm cov kev txwv qis ntawm methane tawg concentration, uas yog qhov txaus ntshai heev.
(3) PPM: PPM yog cov ntawv luv ntawm lus Askiv ib lab, uas txhais tau hais tias ib feem ntawm ib lab, thiab ntim concentration (ppm), uas txhais tau hais tias qhov ntim ntawm cov pa phem muaj nyob hauv ib lab ntim ntawm huab cua.
