Muaj ntau ntau hom kev ntsuas lub cev. Qhov no yog qhov sib txawv ntawm kev nkag siab dav thiab kev nkag siab nqaim. Hauv kev txiav txim siab dav, cov khoom siv roj tau muab faib ua cov khoom siv roj ruaj ruaj thiab cov khoom siv hluav taws xob portable. Lub ntsuas roj ruaj ruaj, raws li nws lub npe txhais tau hais tias, yog lub ntsuas roj av uas tau kho nyob rau hauv ib qho chaw thiab tsis tuaj yeem txav mus los. Lub portable gas detector yog hais txog lub ntsuas roj uas tuaj yeem txav tau txhua lub sijhawm thiab nqa nrog koj.
Hom roj pom los ntawm lub tshuab ntsuas roj:
1. Cov pa taws kub hnyiab: Cov pa taws thiab tawg yog hais txog cov pa hluav taws xob uas tuaj yeem hlawv hauv qhov chaw. Cov roj combustible yog sib xyaw rau hauv qhov sib xyaw ua ke-txhawb nruab nrab hauv ib qho kev faib ua feem, thiab tuaj yeem ua rau combustion lossis tawg nyob rau hauv qhov kev txiav txim ntawm qhov hluav taws kub. Cov pa roj no feem ntau suav nrog hydrocarbons, halogenated hydrocarbons, cawv, methyl acetate thiab lwm yam kev sib xyaw ntawm cov roj hluav taws xob thiab cov nkev.
2. Cov pa phem thiab cov pa phem: Cov pa phem thiab cov pa phem yog hais txog cov tshuaj lom neeg uas yog gaseous los yog tsis tshua muaj volatile nyob rau hauv ib txwm kub thiab siab, thiab los ntawm kev lag luam muaj kuab paug, hlawv ntawm thee thiab roj av, thiab decomposition ntawm cov khoom lom. Feem ntau suav nrog: carbon monoxide, vinyl chloride, hydrogen sulfide, chlorine, hydrogen cyanide, acrylic cyanide, nitrogen dioxide, benzene, ammonia, phosgene, phosgene, fluorine, hydrogen fluoride, arsine, bromine, bromination Hydrogen, germane, diborane, thiab lwm yam.
3. Asphyxiating gases: xws li carbon monoxide, hydrogen sulfide, hydrocyanic acid, carbon dioxide thiab lwm yam gases. Tom qab cov tshuaj no nkag mus rau hauv lub cev, lawv ua rau cov ntaub so ntswg sib txawv thiab cov cell ua hypoxic. Cov pa roj carbon monoxide feem ntau ua rau hemoglobin poob nws lub peev xwm nqa oxygen, ua rau hypoxia. Hydrogen cyanide ncaj qha ua rau cytochrome oxidase, ua rau cov hlwb tsis tuaj yeem nqa thiab siv oxygen. Methane tsis muaj qhov pom tseeb toxicity. Nws tsuas yog txo cov pa oxygen concentration thiab ua rau hypoxic suffocation.
4. Irritating gases: nrog rau cov tshuaj chlorine, phosgene, diphosgene, sulfur dioxide, ammonia oxide, formaldehyde, ammonia, ozone, thiab lwm yam. Cov yam ntxwv ntawm irritant gas nyob rau hauv lub cev yog tias nws muaj zog stimulating nyhuv ntawm daim tawv nqaij thiab mucous daim nyias nyias, ib co ntawm cov uas muaj zog corrosive nyob rau tib lub sij hawm. Lub degree ntawm irritant gas puas rau lub cev muaj feem xyuam rau nws solubility nyob rau hauv dej thiab qhov chaw ntawm kev ua.
Ntawm 6 cov pa roj carbon monoxide uas kuaj pom los ntawm cov khoom siv roj, cov pa oxygen yog ib qho oxidizer thiab kev pab cuam combustion; carbon dioxide thiab nitrogen oxides yog tshuaj lom thiab teeb meem gases; methane yog combustible thiab explosive gas; hydrogen sulfide thiab carbon monoxide tsis yog tsuas yog lom thiab teeb meem gases, tab sis kuj combustible thiab inflammable. Cov pa tawg.
