Lub hauv paus ntsiab lus ua haujlwm ntawm hydrogen sulfide H2S Gas DetectorFeem ntau yog nyob ntawm electrochemical, optical lossis semiconductor sensing technologies. Cov hauv qab no yog cov lus piav qhia ntxaws txog cov ntsiab cai sib xws:
Electrochemical sensors yog siv ntau tshaj plaws, thiab lawv lub hauv paus ntsiab lus yog txhawm rau txheeb xyuas qhov concentration ntawm H₂S los ntawm kev siv cov tshuaj tiv thaiv electrochemical. Muaj ib qho electrolyte (xws li cov kua qaub) thiab peb lub electrodes (ua haujlwm electrode, counter electrode thiab siv electrode) nyob rau hauv lub sensor.
1. Cov txheej txheem ua haujlwm:
(1) H₂S gas ib txwm diffuses mus rau hauv lub sensor los ntawm lub breathable membrane.
(2) Cov tshuaj tiv thaiv oxidation tshwm sim ntawm cov electrode ua haujlwm
(3). Kev txo cov tshuaj tiv thaiv tshwm sim ntawm lub txee electrode (feem ntau txo cov pa oxygen)
(4) Lub generated tam sim no ncaj qha proportional rau H₂S concentration thiab hloov mus rau hauv ib tug concentration nyeem los ntawm Circuit Court.
2. Cov yam ntxwv
(1).Nws tuaj yeem ntes H₂S qhov siab ntawm ppm (ib feem ntawm ib lab) lossis txawm tias ppb (ib feem billion) qib, thiab tsim nyog rau kev saib xyuas qis -cov pa roj carbon monoxide (xws li kev nyab xeeb thiab kev saib xyuas ib puag ncig).
(2).Nws muaj kev xaiv teb rau H₂S. Los ntawm kev ua kom zoo dua cov khoom siv hluav taws xob thiab cov khoom siv electrolyte, kev cuam tshuam ntawm lwm cov pa roj (xws li CO, SO₂) tuaj yeem txo.
(3) Cov zis tam sim no muaj kev sib raug zoo zoo nrog H₂S concentration, uas yooj yim rau kev ua cov teeb liab thiab calibration.
3..Txoj cai ntawm semiconductor sensors: Tom qab qhov saum npoo ntawm cov hlau oxides (xws li SnO₂) adsorbs H₂S, qhov kev hloov pauv.
H₂S reacts nrog cov khoom siv semiconductor, tso tawm electrons thiab ua rau txo qis hauv kev ua haujlwm. Qhov concentration tuaj yeem xam los ntawm kev ntsuas qhov kev hloov pauv los ntawm lub voj voog. Nws muaj tus nqi qis thiab kev pab lub neej ntev, tab sis yooj yim cuam tshuam los ntawm qhov kub thiab av noo thiab yuav tsum tau calibration tsis tu ncua.
4.Optical sensors (xws li NDIR lossis colorimetric method
H₂S molecules muaj cov yam ntxwv haum ntawm qhov tshwj xeeb infrared wavelengths (xws li ~ 3.7 μm), thiab cov concentration yog xam los ntawm kev ntsuas qhov attenuation ntawm lub teeb siv. Cov roj reacts nrog cov tshuaj reagents (xws li lead acetate) los tsim cov xim hloov (xws li dub lead sulfide), thiab qhov tob ntawm cov xim yog kuaj pom los ntawm cov khoom siv photosensitive. Nws tus yam ntxwv yog muaj zog tiv thaiv - muaj peev xwm cuam tshuam, tab sis tus nqi kuj siab, thiab nws feem ntau yog siv rau kev soj ntsuam kev lag luam.