Electrochemical gas sensors rau gas detectors
Ib feem ntawm nws cov nplaim taws, muaj kuab lom thiab muaj teeb meem gases muaj cov khoom siv hluav taws xob thiab tuaj yeem raug 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. 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 qhov concentration ntawm cov pa. Cov piv txwv ua tau zoo ntawm cov sensors no yog cov pa oxygen sensors rau 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.
Infrared Gas Sensor
Feem ntau cov pa roj muaj cov yam ntxwv nqus siab siab hauv nruab nrab thaj tsam infrared. Los ntawm kev txheeb xyuas qhov nqus ntawm qhov chaw ntawm tus yam ntxwv nqus siab ncov, qhov concentration ntawm qee yam roj tuaj yeem txiav txim siab.
Hom sensor no siv los ua cov cuab yeej ntsuas loj, tab sis nyob rau xyoo tas los no, nrog kev txhim kho ntawm kev lag luam sensor raws li MEMS thev naus laus zis, qhov ntim ntawm qhov ntsuas no tau txo qis los ntawm 10 litre, 45 kilogram loj mus txog 2 milliliters (tus ntiv tes xoo. loj). Kev siv cov ntsuas hluav taws xob infrared uas tsis tas yuav hloov kho ntawm lub teeb ci ua rau lub ntsuas ntsuas tsis muaj cov khoom txav mus los thiab tsis muaj kev saib xyuas tag nrho. Infrared gas sensors tuaj yeem paub qhov txawv ntawm cov roj thiab ntsuas qhov ntsuas roj kom raug.
Qhov sensor no tau ua tiav siv los kuaj xyuas cov pa roj carbon dioxide thiab methane.
