Feem ntau siv sensors hauv gas detectors Feem ntau siv sensors hauv gas detectors
Lub hauv paus tseem ceeb ntawm lub ntsuas roj yog lub ntsuas roj, raws li cov qauv ntsuas roj sib txawv tsis zoo ib yam, cov pa roj sib txawv muaj xws li: PID yees duab ionisation sensor, infrared sensor, electrochemical sensor, catalytic combustion sensor thiab semiconductor sensor. Honeywell AIG thev naus laus zis hauv qab no rau koj los qhia txog kev ua haujlwm ntawm txhua lub sensor thiab qhov zoo thiab qhov tsis zoo.
Ua ntej, lub ntsuas roj ntawm lub hauv paus ntsiab lus infrared
Lub hauv paus ntsiab lus: tsis muaj kev ntxub ntxaug infrared txoj cai NDIR sensor yog kev siv Beer-Lambert infrared absorption txoj cai, uas yog, cov roj sib txawv muaj qhov nqus ntawm lub teeb ntawm lub teeb, qhov kev siv ntawm qhov nqus thiab qhov concentration ntawm cov roj yog proportional kom ua tiav kev tshawb pom. Nws siv lub lim los faib lub teeb infrared rau hauv ib pawg me me ntawm cov kab spectral uas xav tau, thiab cov roj yuav tsum tau kuaj pom cov kab me me ntawm cov kab spectral.
Qhov zoo: kev ntseeg siab, kev xaiv zoo, qhov tseeb siab, tsis muaj tshuaj lom, tsis cuam tshuam los ntawm ib puag ncig, lub neej ntev, tsis muaj kev vam khom rau oxygen.
Disadvantages: cuam tshuam los ntawm cov av noo, txwv tsis pub nrhiav pom cov roj hom, tam sim no tseem ceeb tshaj plaws daim ntawv thov ntawm methane, carbon dioxide, carbon monoxide, sulfur hexafluoride, sulfur dioxide, hydrocarbons thiab lwm yam gases.
Thib ob, lub hauv paus ntsiab lus ntawm semiconductor ntawm cov roj ntes
Lub hauv paus ntsiab lus: semiconductor gas sensor yog siv qee cov khoom siv hlau oxide semiconductor, qee qhov kub thiab txias, tsis kam hloov nrog ib puag ncig muaj pes tsawg leeg ntawm cov roj thiab hloov lub hauv paus ntsiab lus ntawm kev tsim khoom. Piv txwv li, cawv sensors, yog kev siv cov tin dioxide ntawm qhov kub thiab txias thaum ntsib cov pa roj cawv, kev tiv thaiv yuav txo qis cov ntsiab lus ntawm kev npaj.
Qhov zoo: tus nqi qis, kev tsim khoom yooj yim, siab rhiab heev, lub sij hawm teb ceev ceev, lub neej ntev, tsis tshua muaj rhiab heev rau cov av noo thiab yooj yim Circuit Court thiab lwm yam zoo.
Qhov tsis zoo: kev ruaj ntseg tsis zoo, cuam tshuam los ntawm ib puag ncig, tshwj xeeb tshaj yog qhov kev xaiv ntawm txhua lub sensor tsis yog qhov tshwj xeeb, cov khoom tso tawm tsis tuaj yeem txiav txim siab. Yog li ntawd, nws tsis haum rau daim ntawv thov nyob rau hauv kev ntsuas qhov tseeb ntawm qhov chaw, feem ntau yog siv rau pej xeem siv.
Thib peb, lub hauv paus ntsiab lus catalytic combustion ntawm gas detector
Lub hauv paus ntsiab lus: catalytic combustion sensor yog nyob rau hauv lub platinum tiv thaiv nto npaj ntawm high-temperature resistant catalyst txheej, ib tug tej yam kub, combustible gases nyob rau hauv lub nto ntawm catalytic combustion, combustion kom lub platinum kuj kub nce, tsis kam hloov, hloov nyob rau hauv tus nqi. lub combustible gas concentration muaj nuj nqi.
Qhov zoo: Catalytic combustion gas sensors selectively detect flammable gases: xijpeem tsis tuaj yeem hlawv, lub sensor tsis muaj lus teb. Cov lus teb ceev ceev, lub neej ntev, me ntsis cuam tshuam los ntawm qhov kub thiab txias, av noo thiab siab. Cov zis ntawm lub sensor yog ncaj qha cuam tshuam rau qhov tawg txaus ntshai ntawm ib puag ncig thiab yog ib chav kawm tseem ceeb ntawm sensor nyob rau hauv kev tshawb nrhiav kev nyab xeeb.
Disadvantages: tsis xaiv nyob rau hauv ntau yam ntawm flammable gases. Lub sensor yog raug rau lom, thiab feem ntau cov ntsiab lus organic vapors yog tshuaj lom rau lub sensor.
Nco tseg: Catalytic combustion detection tuaj yeem pom tau tias muaj xwm txheej, nws yuav tsum tau ua kom paub tseeb tias qhov chaw kuaj pom muaj cov pa oxygen txaus, thaum tsis muaj oxygen ib puag ncig qhov kev kuaj pom no yuav tsis pom cov roj combustible. Qee cov hmoov txhuas (tshwj xeeb tshaj yog tetraethyl lead), sulfur compounds, silicones, phosphorus compounds, hydrogen sulfide thiab halogenated hydrocarbons yuav ua rau lub sensor lom los yog inhibition.
Plaub, lub hauv paus ntsiab lus ntawm cov roj ntes PID
Lub hauv paus ntsiab lus: PID los ntawm lub teeb ci ultraviolet thiab ion chamber thiab lwm qhov tseem ceeb ntawm cov ion chamber muaj qhov zoo thiab tsis zoo electrodes, tsim cov hluav taws xob hluav taws xob, cov roj yuav tsum ntsuas hauv irradiation ntawm lub teeb ultraviolet, ionisation. , tiam ntawm qhov zoo thiab tsis zoo ions, tsim ntawm cov hluav taws xob tam sim no ntawm cov electrodes, lub teeb liab tso zis amplified
Qhov zoo: siab rhiab heev, tsis muaj teeb meem lom.
Qhov tsis zoo: tsis muaj kev xaiv, cuam tshuam los ntawm cov av noo, lub neej luv luv ntawm lub teeb ultraviolet, kim.
Thib tsib, lub hauv paus ntsiab lus ntawm lub tshuab hluav taws xob electrochemical
Lub hauv paus ntsiab lus: los ntawm cov electrolyte hauv lub sensor thiab lub hom phiaj roj cov tshuaj tiv thaiv thiab tsim thiab roj concentration proportional rau hluav taws xob teeb liab ua hauj lwm.
Qhov zoo: kev khiav hauj lwm kub ntau, ntau yam, siab rhiab heev, tawm tawm linear, zoo selectivity.
Qhov tsis zoo: lub neej luv luv, lub sijhawm cia tsawg, lub neej luv luv nyob rau hauv qhov chaw qhuav heev lossis cov pa roj ntau ntau, tsis muaj qhov tshwj xeeb, cuam tshuam rau kev cuam tshuam, av noo muaj feem cuam tshuam rau qhov raug.
Lus Cim: Feem ntau cov pa roj carbon monoxide yuav tsum muaj cov pa me me kom ua haujlwm zoo. Muaj lub qhov cua nyob rau sab nraum qab ntawm lub sensor rau lub hom phiaj no. High humidity thiab drought siab tuaj yeem cuam tshuam rau lub neej sensor. Kev hloov siab tam sim no tuaj yeem ua rau lub sijhawm hloov pauv hloov pauv thiab tuaj yeem ncav cuag lub tswb tsis tseeb.
