Kev saib xyuas cov roj ntes thiab ntsuas lub neej ntev
Kev saib xyuas ntawm lub tshuab ntsuas roj tau mus txog qhov ntsuas lub neej
Gas detector yog ib qho cuab yeej cuab tam rau kev soj ntsuam roj to concentration, uas muaj xws li portable gas detectors, handheld gas detectors, fixed gas detectors, online gas detectors, thiab lwm yam. Feem ntau siv roj 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 gases.
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 puas 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 qhov tseem ceeb roj sensors, txawm hais tias qee zaum lawv siv feem ntau raws li kev tshawb pom.
kev faib tawm
Hom semiconductor
Nws yog tsim los siv lub hauv paus ntsiab lus uas cov conductivity ntawm ib co hlau oxide semiconductor cov ntaub ntawv hloov nrog cov muaj pes tsawg leeg ntawm ib puag ncig roj ntawm ib tug tej yam kub thiab txias. Piv txwv li, lub ntsuas dej cawv tau npaj siv lub hauv paus ntsiab lus tias thaum tin dioxide ntsib cov pa roj cawv ntawm qhov kub thiab txias, nws qhov tsis kam yuav txo qis.
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 roj av. Cov khoom siv hluav taws xob semiconductor hauv qab no tau ua tiav: methane (natural gas, biogas), cawv, carbon monoxide (lub nroog gas), hydrogen sulfide, ammonia (xws li amines, hydrazine). Cov cuab yeej zoo siab 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 siv nyob rau hauv qhov chaw uas yuav tsum tau ntsuas kom raug.
Hom combustion
Hom sensor no yog cov txheej txheem kub-resistant catalyst txheej npaj 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 qhov concentration ntawm combustible gases raws li lub platinum resistor kub nce thiab cov kuj hloov.
Thermal conductivity pas dej ua ke
Txhua lub roj muaj nws tus kheej tshwj xeeb thermal conductivity. Thaum muaj qhov sib txawv tseem ceeb hauv thermal conductivity ntawm ob los yog ntau dua gases, lub thermal conductivity tuaj yeem siv los paub qhov txawv cov ntsiab lus ntawm ib feem. Hom sensor no tau dav siv rau kev tshawb nrhiav hydrogen, carbon dioxide, thiab siab concentration methane.
Hom roj sensor no muaj ib daim ntawv thov nqaim thiab ntau yam txwv.
Electrochemical formula
Ib feem ntawm nws cov nplaim hluav taws kub, cov pa phem thiab cov pa phem muaj cov khoom siv hluav taws xob thiab tuaj yeem ua rau electrochemically oxidized los yog 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. Muaj ntau yam subcategories ntawm electrochemical gas sensors:
(1) Lub hauv paus ntsiab lus ntawm thawj cell hom roj sensors (tseem hu ua Gavoni cell type gas sensors, fuel cell type gas sensors, and spontaneous cell type gas sensors) yog tib yam li cov roj teeb qhuav uas peb siv, tshwj tsis yog cov pa roj carbon manganese. electrode ntawm lub roj teeb yog hloov los ntawm ib tug roj electrode. Noj cov pa oxygen sensor ua piv txwv, oxygen txo qis ntawm cathode, thiab electrons ntws los ntawm ammeter mus rau anode, qhov twg cov hlau lead yog oxidized. Qhov loj ntawm qhov tam sim no ncaj qha ntsig txog qhov concentration ntawm oxygen. Hom sensor no tuaj yeem ntes cov pa oxygen, sulfur dioxide, chlorine gas, thiab lwm yam.
(2) Lub peev xwm tas li electrolytic cell type gas sensor yog qhov zoo heev hauv kev kuaj xyuas cov pa roj. Nws lub hauv paus ntsiab lus txawv ntawm qhov tseem ceeb ntawm lub roj teeb hom sensor. Nws cov tshuaj tiv thaiv electrochemical tshwm sim nyob rau hauv lub zog ntawm tam sim no, ua rau nws muaj tseeb sensor rau Coulomb tsom xam. Hom sensor no tau ua tiav hauv kev tshawb nrhiav cov pa roj xws li carbon monoxide, hydrogen sulfide, hydrogen, ammonia, hydrazine, thiab lwm yam. Nws yog tam sim no lub ntsiab sensor rau kev kuaj cov pa phem thiab cov pa phem.
(3) Lub concentration sib txawv roj teeb hom roj sensor, uas muaj electrochemical kev ua, spontaneously tsim ib tug concentration txawv electromotive quab yuam ntawm ob sab ntawm lub electrochemical roj teeb. Qhov loj ntawm lub zog electromotive muaj feem xyuam rau cov concentration ntawm cov pa. Cov piv txwv ua tau zoo ntawm cov sensors no yog cov pa oxygen sensors rau lub tsheb thiab cov khoom electrolyte hom carbon dioxide sensors.
(4) Ib hom roj hluav taws xob tam sim no yog hom sensor uas ntsuas oxygen concentration. Nws siv lub hauv paus ntsiab lus hais tias qhov huab cua tam sim no nyob rau hauv cov hluav taws xob hluav taws xob muaj feem xyuam rau cov neeg nqa khoom concentration los npaj cov pa oxygen (gas) concentration sensor, uas yog siv rau kev tshawb nrhiav oxygen hauv tsheb thiab nrhiav kom pom oxygen concentration hauv cov hlau molten.
