Hauv kev tsim khoom, hydrogen tau dav siv los ua lub zog huv thiab cov khoom siv tseem ceeb hauv kev lag luam. Txawm li cas los xij, hydrogen muaj lub zog hluav taws xob qis heev thiab muaj ntau yam tawg; yuav tsum muaj qhov xau tshwm sim thiab sib sau ua ke hauv qhov chaw kaw lossis ib nrab- qhov chaw kaw, nws tuaj yeem ua rau hluav taws kub lossis tawg tau yooj yim, ua rau muaj kev hem thawj rau cov neeg ua haujlwm nyab xeeb thiab khoom siv. Nyob rau hauv ib puag ncig uas cov dej xau tuaj yeem tshwm sim-xws li chaw nres tsheb hydrogen, chav roj teeb, thiab chaw ua haujlwm tsim khoom semiconductor- kev saib xyuas raws sijhawm thiab raug yog qhov kev ntsuas kev nyab xeeb tseem ceeb.
Lub roj teeb hydrogen leak detection feem ntau ntiav ob hom kev ntes: electrochemical sensors thiab catalytic combustion sensors. Qhov kev xaiv tshwj xeeb yog nyob ntawm daim ntawv thov scenario, yuav tsum tau kuaj xyuas qhov tseeb, thiab kev nyab xeeb specifications.
I. Mainstream Sensor Hom thiab yam ntxwv
(1). Electrochemical Sensors
Qhov no tam sim no yog qhov kev xaiv tseem ceeb rau kev saib xyuas cov kab ke hauv cov chav roj teeb (tshwj xeeb tshaj yog rau cov hmoov lead-acid thiab nickel-cadmium roj teeb).
Txoj Cai Ua Haujlwm: Hydrogen tau txais cov tshuaj tiv thaiv hluav taws xob (oxidation{0}}txo) ntawm qhov chaw ua haujlwm electrode, ua kom muaj micro-tam sim no; qhov loj ntawm qhov tam sim no yog ncaj qha proportional rau hydrogen concentration.
High Sensitivity thiab Selectivity: Highly xaiv rau hydrogen, zoo tsis txhob cuam tshuam los ntawm lwm yam gases; tsim tshwj xeeb rau kev tshawb nrhiav hydrogen.
Tsim nyog rau Tsawg- Kev Saib Xyuas Kev Cuam Tshuam: Cov rhiab heev rau cov kab xau (ppm qib), ua rau muaj kev ceeb toom ntxov. Piv txwv li, mining - qib sensors tuaj yeem ua rau lub tswb thiab txuas kev nyab xeeb ua haujlwm thaum hydrogen concentration nce mus txog 0.5%.
Intrinsically Safe: Haum rau siv nyob rau hauv ib puag ncig nrog nruj tawg - cov ntaub ntawv pov thawj.
Application Scenarios: Dav siv nyob rau hauv qhov chaw ruaj khov uas yuav tsum tau ntev -lub sij hawm, tsis tu ncua, thiab xyuas kom meej ntawm cov hydrogen concentrations tsawg, xws li chav roj teeb thiab underground charging chambers hauv mines.
(2). Catalytic combustion Sensors
Feem ntau siv los txheeb xyuas qhov flammability ntawm hydrogen thiab saib xyuas cov concentrations nyob rau hauv qis qis qis (LEL) ntau yam.
Txoj Cai Ua Haujlwm: Hydrogen hlawv rau ntawm qhov chaw ntawm lub catalytic, ua rau muaj kev hloov pauv hauv lub caij kub thiab hluav taws xob tsis kam; qhov concentration yog txiav txim los ntawm kev ntsuas qhov kev hloov pauv hauv qhov tsis kam.
Fast Response Speed: Reacts sai sai rau cov kev hloov pauv ntawm cov roj combustible concentration.
Good Signal Linearity: Muab cov teeb liab zoo linearity hauv LEL concentration ntau. Daim ntawv thov Scenario: Feem ntau yog siv los saib xyuas seb cov hydrogen concentrations tau mus txog theem ua rau muaj kev phom sij tawg; feem ntau xa mus rau hauv qhov zoo - qhov cua qhov chaw uas cov lus teb ceev yog qhov tseem ceeb.
2. Lwm yam Sensor yees thiab daim ntawv thov scenarios
Semiconductor Sensors: Ua haujlwm ntawm lub hauv paus ntsiab lus hais tias hluav taws xob tsis kam ntawm hlau -Oxide semiconductor cov ntaub ntawv hloov pauv thaum sib cuag nrog hydrogen. Cov sensors no raug nqi -zoo thiab rhiab heev rau hydrogen tab sis muaj kev cuam tshuam los ntawm lwm yam kev txo cov pa roj lossis kev hloov pauv ib puag ncig. Lawv xav tau kev ruaj ntseg zoo heev thiab feem ntau yog siv rau hauv cov ntawv thov uas huab precision tsis yog qhov tseem ceeb.
Thermal Conductivity Sensors: Raws li qhov sib txawv ntawm thermal conductivity ntawm hydrogen thiab lwm yam roj (feem ntau yog cua). Raws li hydrogen concentration hloov, tus nqi ntawm cov cua kub dissipation los ntawm lub sensor lub sensing caij nws txawv, cia lub concentration yuav tsum tau ntsuas. Cov sensors no muaj lub neej ua haujlwm ntev, kev ruaj ntseg zoo, thiab tsis kam mus rau sensor lom; Txawm li cas los xij, lawv feem ntau yog siv los ntsuas qhov siab hydrogen concentrations (feem pua ntawm cov qib) thiab tsis muaj kev nkag siab txaus rau kev kuaj xyuas qis - theem xau.
Infrared Absorption Sensors: Tshawb xyuas hydrogen raws li nws cov yam ntxwv ntawm lub teeb infrared nqus. Lawv muab cov txiaj ntsig zoo xws li tsis yog-kev ua haujlwm, kev ua neej ntev, kev ruaj ntseg siab, thiab muaj zog cuam tshuam; Txawm li cas los xij, cov cuab yeej siv niaj hnub ntsib cov teeb meem hais txog qhov tsis muaj zog hydrogen nqus cov cim thiab cov nqi siab. Cov thev naus laus zis no sawv cev rau cov lus cog tseg rau yav tom ntej siab - kawg, ntev - daim ntawv thov kev soj ntsuam ruaj khov.
3. Cov lus pom zoo xaiv thiab kev sib koom ua ke
Rau kev ruaj khov, kev saib xyuas thaj tsam tas mus li hauv chav roj teeb - qhov twg lub hom phiaj tseem ceeb yog ceeb toom ntxov ntawm cov dej xau hauv feeb -electrochemical sensors yuav tsum yog qhov kev xaiv. Hydrogen cheeb tsam saib xyuas tshwj xeeb tsim rau chav roj teeb ntawm kev ua lag luam feem ntau siv cov thev naus laus zis no.
Yog tias lub hom phiaj tseem ceeb yog kev nyab xeeb tawg- tshwj xeeb saib xyuas seb puas muaj cov concentrations mus txog qhov Tsawg Tshaj Tawm Tsawg (LEL) ntawm 4%-catalytic combustion sensors yuav raug xaiv.
Kev sib xyaw ua ke: Ib qho kev tshawb nrhiav hydrogen muaj xws li tsis yog cov cuab yeej ntes nkaus xwb tab sis kuj yog cov tswj thiab lub tswb modules. Nws yuav tsum muaj peev xwm cuam tshuam nrog cov khoom siv kev nyab xeeb xws li cov kiv cua tso pa thiab solenoid li qub los tsim kom muaj kev tiv thaiv zoo. Cov cuab yeej tuaj yeem ua ke nrog cov kev tswj hwm uas twb muaj lawm los ntawm cov khoom siv analog (4-20 mA) lossis cov tsheb npav digital (xws li RS485).
Rau qhov chaw ruaj khov uas xav tau kev ceeb toom ntxov thiab kev soj ntsuam tas li ntawm hydrogen los ntawm cov roj teeb,hydrogen gas detector rau chav roj teebraws li cov txheej txheem electrochemical raug pom zoo. Rau cov ntawv thov tseem ceeb ua ntej cov lus teb ceev ceev rau kev pheej hmoo tawg, catalytic combustion sensors yuav raug txiav txim siab. Thaum xaiv ib tus qauv, nws yuav tsum ua tib zoo xav txog kev ntsuas ntau yam, rhiab heev, ib puag ncig adaptability, kev pab lub neej, thiab tus nqi.