Electrochemical sensors siv los ntsuas cov pa roj
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) zoo ib 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 cov roj electrode. Piv txwv li, nyob rau hauv ib tug oxygen sensor, oxygen yog txo nyob rau hauv lub cathode, thiab electrons ntws los ntawm ammeter mus rau lub 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 qub roj teeb hom sensors. 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) Concentration roj teeb hom roj sensors, nrog electrochemically active gases ntawm ob sab ntawm lub electrochemical cell, yuav spontaneously tsim concentration electromotive quab yuam. 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 qho kev txwv tam sim no roj sensor yog ib hom sensor uas ntsuas oxygen concentration. Nws siv lub hauv paus ntsiab lus hais tias qhov txwv tam sim no nyob rau hauv ib qho hluav taws xob hluav taws xob muaj feem cuam tshuam nrog cov khoom thauj mus los los npaj cov pa oxygen (gas) concentration sensor, uas yog siv rau kev tshawb nrhiav oxygen hauv tsheb thiab txhawm rau kuaj cov pa oxygen hauv cov hlau molten.
