Lub combustible gas detector muaj ob yam: nrhiav thiab nrhiav kom tau
Muaj ntau cov roj hluav taws xob hauv peb lub neej, xws li hydrogen, carbon monoxide, methane, ethane, propane, butane, ethylene, propylene, butene, acetylene, propyne, butyne, hydrogen sulfide, phosphine, thiab lwm yam ... thiab ntau cov nkev nplaim taws. lawv tus kheej yog cov pa phem thiab tsis zoo, xws li CO, H2S, Cl2 thiab lwm yam.
Combustible gases tshwm sim nyob rau hauv ntau industries. Thaum cov hluav taws kub hnyiab no dhau qhov kev xav tau, cov xwm txheej loj xws li tawg lossis hluav taws yuav tshwm sim. Yog li ntawd, lawv nrhiav tau yog ib qho tseem ceeb heev.
Cov khoom siv hluav taws xob hluav taws xob yog cov cuab yeej teeb tsa thiab siv nyob rau hauv cov tsev lag luam thiab pej xeem cov tsev uas teb rau ib leeg lossis ntau cov pa taws. Nws muab faib ua ob ntu: kev tshawb nrhiav thiab kev tshawb nrhiav. Qhov kev tshawb nrhiav tau muab faib ua ob pawg raws li hom sensor: hom catalytic combustion thiab semiconductor hom.
1. Catalytic combustion type combustible gas sensor siv qhov kev hloov pauv ntawm refractory hlau platinum hlau tom qab cua sov los ntsuas qhov concentration ntawm cov roj combustible.
Thaum cov roj flammable nkag mus rau hauv lub ntes, nws ua rau oxidation cov tshuaj tiv thaiv (flameless combustion) nyob rau saum npoo ntawm platinum hlau, thiab lub tshav kub generated tsub kom qhov kub ntawm lub platinum hlau. Tom qab qhov kub thiab txias hloov, qhov kev tiv thaiv tus nqi ntawm cov hlau platinum kuj hloov, thiab lub ntsuas ntsuas qhov ntsuas tus nqi ntawm cov roj ntsuas yog txiav txim siab los ntawm kev sau cov kev hloov pauv ntawm tus nqi tiv thaiv ntawm platinum hlau.
2. Lub semiconductor hom combustible gas sensor siv qhov kev hloov ntawm qhov chaw tsis kam ntawm semiconductor los ntsuas qhov concentration ntawm combustible gas.
Thaum cov roj combustible hu rau saum npoo ntawm lub semiconductor thiab yog adsorbed, cov adsorbed molecules dawb diffuse nyob rau saum npoo ntawm cov khoom, thiaj li hais tias cov tsis kam ntawm lub semiconductor hloov, thiab lub detector txiav txim siab concentration ntawm cov combustible gas raws li kev hloov ntawm tus nqi kuj ntawm cov semiconductor.
Lub hauv paus ntsiab lus ntawm kev tshawb nrhiav ib feem ntawm lub combustible gas detector yog hais tias lub sensor ntawm lub ntsuas siv ib tug nrhiav kom tau lub ntsiab, ib tug ruaj resistor thiab ib tug xoom-kho potentiometer los tsim ib tug nrhiav kom tau choj. Tus choj Circuit Court siv platinum hlau ua cov cab kuj catalytic. Tom qab hluav taws xob hluav taws xob, qhov kub ntawm cov hlau platinum nce mus rau qhov ua haujlwm kub, thiab huab cua mus txog qhov chaw ntawm lub caij los ntawm txoj kev ntawm ntuj diffusion los yog nqus twj tso kua mis.
Thaum tsis muaj cov pa hluav taws xob hauv huab cua, qhov tso tawm ntawm tus choj Circuit Court yog xoom. Thaum cov huab cua muaj cov pa roj tsw qab thiab diffuses mus rau cov khoom tshawb nrhiav, flameless combustion tshwm sim vim qhov kev ua catalytic, uas ua rau kom qhov kub thiab txias ntawm cov khoom kuaj pom thiab ua rau muaj kev tiv thaiv ntawm platinum hlau. , tus choj Circuit Court yog tawm ntawm qhov sib npaug, yog li muaj qhov hluav taws xob hluav taws xob tso tawm. Qhov loj ntawm qhov voltage yog proportional rau qhov concentration ntawm cov roj combustible. Lub teeb liab yog amplified thiab hloov dua siab tshiab los ntawm analog rau digital, thiab cov concentration tus nqi ntawm cov roj combustible yog tso tawm los ntawm cov zaub vaj huam sib luag.
