Dab tsi yog qhov combustible gas range?
Qhov kev tshawb nrhiav ntau yam ntawm cov khoom siv roj hluav taws xob feem ntau nyob hauv thaj tsam ntawm 0-100% LEL. Yog tias cov pa tawm ntawm cov pa hluav taws xob kuaj pom muaj ntau dua 25% LEL thiab tsawg dua 50% LEL, lub tshuab hluav taws xob hluav taws xob hluav taws xob yuav tawm lub tswb qis. Thaum lub concentration ntawm combustible gas to kuaj pom muaj ntau tshaj 50% LEL, lub combustible gas detector yuav emit ib tug high-frequency suab thiab lub teeb ceeb toom ceeb toom teeb liab los txhim kho kev tswj ntawm combustible gases nyob rau hauv ib puag ncig los ntawm on-site tswv, yog li. ua tiav kev nyab xeeb thiab ua haujlwm tau zoo.
Lub combustible gas detector yuav ntes tau ntau combustible gases, xws li natural gas, liquefied gas, thee gas, ethane, acetylene, butane, n-butane, isobutane, pentane, hexane, halogenated hydrocarbons (chloromethane, methylene chloride, trichloroethane, vinyl). , cawv (methanol, ethanol, propanol), ethers, ketones (butanone, acetone), hydrogen, toluene, thiab lwm yam sib txuas ( roj av, muaj kuab tshuaj, xim, diluents, coolants, qhuav ntxuav kua, methyl acetate, thiab lwm yam).
LEL yog dab tsi?
LEL yog hais txog qhov kev txwv qis ntawm cov pa roj. Thaum cov vapor (los yog combustible plua plav) ntawm ib tug combustible gas los yog kua sib tov nrog huab cua thiab mus txog ib tug tej yam concentration, nws yuav tawg thaum ntsib hluav taws. Qhov concentration ntau nyob rau hauv qhov kev tawg tuaj yeem tshwm sim yog hu ua qhov txwv tsis pub tawg. Qhov qis dua qhov txwv ntawm txhua qhov roj sib txawv.
Qhov kev txwv tawg ntawm cov pa roj hydrogen yog raws li hauv qab no: qhov txwv qis yog 4.0%, qhov txwv sab saud yog 74.2%, thiab nws tuaj yeem ua rau tawg thiab tawg thaum ntsib huab cua thiab qhib nplaim taws. 4.0% yog qhov ntim tsawg kawg nkaus rau cov roj hydrogen kom tawg thaum ntsib hluav taws qhib. Yog tias nws tsawg dua cov kab hauv qab no, nws yuav tsis tawg thiab yuav tsis tawg thaum ntsib cov nplaim taws qhib. 74.2% yog qhov txwv siab tshaj plaws (lossis sab sauv txwv) ntawm cov khoom ntim siab tshaj plaws. Thaum lub ntim feem ntau tshaj qhov kev txwv saum toj no, nws tuaj yeem ua kom muaj kev nyab xeeb ntawm huab cua thiab qhib nplaim taws, thiab yuav tsis muaj qhov tawg. Nyob rau hauv luv luv, ib tug ntau yam nrog ib tug ntim feem hauv qab no los yog nyob rau hauv lub explosion txwv yuav tsis tawg thaum raug qhib nplaim taws.
Catalytic combustion gas detectors yog siv los saib xyuas cov kev hloov pauv ntawm cov pa roj carbon monoxide hauv cov huab cua ib puag ncig los ntawm 0 mus rau 100% LEL. Qhov no sensor txais catalytic combustion tshuab thiab tuaj yeem hloov tau ntawm qhov chaw. Catalytic combustion sensors muaj cov lus teb rhiab heev rau ntau yam roj combustible. Cov tshuab no muaj universal applicability rau combustible gases.
Combustible gas detector yog ib tug gas detector ntsia thiab siv nyob rau hauv industrial thiab civil vaj tse uas teb rau ib los yog ntau combustible gas concentrations. Cov khoom siv hluav taws xob feem ntau siv hauv lub neej niaj hnub yog catalytic combustible gas detectors thiab semi conductive combustible gas detectors.
Semiconductive combustible gas detectors feem ntau yog siv rau hauv cov chaw xws li tsev noj mov, tsev so, thiab chav tsim khoom hauv tsev uas siv cov pa roj, nkev, thiab roj liquefied. Catalytic combustible gas detectors feem ntau yog siv nyob rau hauv industrial chaw uas emit combustible gases thiab vapors.
