Kev tu thiab sensor lub neej ntawm cov roj ntes
Gas detector yog ib qho cuab yeej cuab tam rau kev soj ntsuam roj to concentration, xws li portable gas detector, handheld gas detector, fixed gas detector, online gas detector, etc. Feem ntau yog siv cov pa sensors los xyuas cov hom gases tam sim no nyob rau hauv ib puag ncig, roj sensors yog sensors. siv los xyuas qhov muaj pes tsawg leeg thiab cov ntsiab lus ntawm cov pa roj.
Nws yog feem ntau ntseeg hais tias lub ntsiab lus ntawm cov pa sensors yog raws li kev faib tawm ntawm kev tshawb nrhiav lub hom phiaj, uas txhais tau hais tias txhua lub sensor siv los ntsuas cov roj muaj pes tsawg leeg thiab concentration yog hu ua roj sensor, tsis hais seb nws siv lub cev lossis tshuaj. Piv txwv li, cov sensors uas ntes cov roj ntws tsis suav tias yog cov roj hluav taws xob, tab sis thermal conductivity gas analyzers yog ib qho tseem ceeb roj sensors, txawm hais tias qee zaum lawv siv feem ntau raws li cov qauv kev tshawb nrhiav.
kev faib tawm
Hom semiconductor
Nws yog tsim los siv lub hauv paus ntsiab lus hais tias cov conductivity ntawm ib co hlau oxide semiconductor cov ntaub ntawv hloov nrog cov muaj pes tsawg leeg ntawm cov roj ambient ntawm ib tug tej yam kub. Piv txwv li, lub ntsuas dej cawv tau npaj raws li lub hauv paus ntsiab lus uas thaum tin dioxide ntsib cov roj cawv ntawm qhov kub thiab txias, nws qhov kev tiv thaiv yuav txo qis heev.
qhov zoo
Semiconductor gas sensors tuaj yeem siv tau zoo los kuaj xyuas ntau cov pa roj xws li methane, ethane, propane, butane, cawv, formaldehyde, carbon monoxide, carbon dioxide, ethylene, acetylene, vinyl chloride, styrene, acrylic acid, thiab lwm yam. tshwj xeeb tshaj yog, hom no. sensor yog tus nqi qis thiab tsim nyog rau cov kev xav tau ntawm kev tshawb nrhiav cov pa roj. Cov khoom siv hluav taws xob hauv qab no tau ua tiav: methane (natural gas, biogas), cawv, carbon monoxide (lub nroog gas), hydrogen sulfide, ammonia (xws li amines thiab hydrazine). Cov sensors zoo tuaj yeem ua tau raws li qhov xav tau ntawm kev sim kev lag luam.
ua tsis tau
Kev ruaj ntseg tsis zoo thiab cuam tshuam ib puag ncig tseem ceeb; Tshwj xeeb tshaj yog, qhov kev xaiv ntawm txhua lub sensor tsis txawv, thiab cov zis tsis tuaj yeem txiav txim siab. Yog li ntawd, nws tsis haum rau qhov chaw uas xav tau kev ntsuas kom raug.
Hom combustion
Hom sensor no yog npaj nrog lub siab kub resistant txheej catalyst rau saum npoo ntawm platinum resistor. Ntawm qhov kub thiab txias, combustible gases catalyze combustion ntawm nws nto. combustion yog ib qho kev ua haujlwm ntawm cov concentration ntawm cov roj combustible raws li qhov kub thiab txias ntawm platinum resistor nce thiab qhov kev hloov pauv.
Thermal conductivity pas dej ua ke
Txhua cov roj muaj nws tus kheej cov thermal conductivity, thiab thaum muaj qhov sib txawv ntawm thermal conductivity ntawm ob los yog ntau dua gases, lub thermal conductivity tuaj yeem siv los txheeb xyuas cov ntsiab lus ntawm ib feem. Hom sensor no tau dav siv los kuaj xyuas hydrogen, carbon dioxide, thiab siab concentration methane.
Qhov no gas sensor muaj ib tug nqaim daim ntawv thov ntau yam thiab ntau yam limiting yam.
Electrochemical formula
Ib feem tseem ceeb ntawm nws cov nplaim taws, muaj kuab lom, thiab cov pa phem muaj cov khoom siv hluav taws xob thiab tuaj yeem ua rau electrochemically oxidized lossis txo. Los ntawm kev siv cov tshuaj tiv thaiv no, cov roj muaj pes tsawg leeg tuaj yeem paub qhov txawv thiab cov roj concentration tuaj yeem kuaj pom. Electrochemical gas sensors muab faib ua ntau pawg
