Cov chav nyob ntawm qhov ntsuas roj sawv cev li cas?
(1) feem pua VOL (gas concentration to volume ratio): Tshawb xyuas cov pa oxygen thiab carbon dioxide, thiab siv chav tsev no los nyeem cov nqi ncaj qha.
(2) feem pua LEL (qis explosive limit): yog hais txog qhov tsawg kawg nkaus concentration ntawm qhov tawg tshwm sim thaum cov roj combustible tov nrog huab cua thiab ua tau raws li qhov tsawg kawg nkaus ignition zog.
Portable gas detectors feem ntau muaj lub tswb taw tes teeb tsa hauv qab 25 feem pua LEL ntawm qhov txwv tsis pub tawg.
Piv txwv li, qhov kev txwv qis qis ntawm methane yog 5 feem pua VOL, uas txhais tau hais tias 5 feem pua VOL muab faib ua 100 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 methane concentration ntawm 5 feem pua VOL * 25 feem pua =1.25 feem pua VOL lub sijhawm no.
Tseem muaj txoj hauv kev ntev mus los ntawm kev txwv qis ntawm 5 feem pua VOL rau methane tawg, yog li tsis tas yuav txhawj xeeb txog qhov txaus ntshai tom qab lub tswb. Qhov no tsuas yog ceeb toom kom ua raws li cov kev ntsuas tam sim ntawd.
Yog tias tus nqi nce mus txog 100 feem pua LEL, nws yuav tsum tau muab sau tseg tias qhov kev txwv qis ntawm methane tawg concentration ntawm 5 feem pua tau mus txog, uas yog qhov txaus ntshai heev.
(3) PPM: PPM yog cov ntawv luv rau ib feem ntawm ib lab hauv lus Askiv, sawv cev rau qhov ib lab, ntim qhov ntim (ppm), thiab 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 chav nyob ntawm qhov loj (xws li mg / m3).
Dab tsi yog qhov txawv ntawm passive gas detector thiab active gas detector?
Teb: Passive gas detectors mas ntes roj los ntawm ntws mus rau hauv lub detector los ntawm cov roj ntws; Lub active gas detector mas nqus cov pa ambient los ntawm lub twj tso kua mis thiab nkag mus rau hauv lub detector.
