Lub Ntsiab Cai thiab Kev Ua Haujlwm ntawm Cov Khoom Siv Kho Kub rau pH Meters thiab Conductivity Meters

II. Cov Kev Xav Txog Kev Ua Haujlwm rau pH thiab Conductivity Meters nrog Kev Them Nyiaj Kub

1. Cov Lus Qhia rau Kev Siv Cov Khoom Siv Kho Kub thiab Kub ntawm pH Meter
Vim tias lub teeb liab mV ntsuas tsis hloov pauv nrog qhov kub thiab txias, lub luag haujlwm ntawm lub tshuab them kub yog hloov kho qhov nqes hav (coefficient hloov pauv K) ntawm qhov teb electrode kom phim qhov kub thiab txias tam sim no. Yog li ntawd, nws yog ib qho tseem ceeb kom ntseeg tau tias qhov kub ntawm cov tshuaj buffer siv thaum lub sijhawm calibration phim qhov ntawm cov qauv uas ntsuas, lossis tias qhov kev them kub raug siv. Yog tsis ua li ntawd yuav ua rau muaj qhov yuam kev, tshwj xeeb tshaj yog thaum ntsuas cov qauv deb ntawm qhov kub thiab txias calibration.

2. Cov Lus Qhia rau Kev Siv Cov Khoom Siv Ntsuas Kub Conductivity Meter
Tus coefficient kho qhov kub thiab txias (β) ua lub luag haujlwm tseem ceeb hauv kev hloov cov conductivity ntsuas mus rau qhov kub thiab txias siv. Cov tshuaj sib txawv qhia txog cov nqi β sib txawv - piv txwv li, cov dej ntuj feem ntau muaj β kwv yees li 2.0–2.5% / ° C, thaum cov kua qaub lossis cov hauv paus muaj zog yuav txawv ntau. Cov cuab yeej nrog cov coefficient kho ruaj khov (piv txwv li, 2.0% / ° C) yuav ua rau muaj qhov yuam kev thaum ntsuas cov tshuaj tsis yog tus qauv. Rau cov ntawv thov siab, yog tias tus coefficient ua tiav tsis tuaj yeem hloov kho kom phim qhov tseeb β ntawm cov tshuaj, nws raug pom zoo kom kaw qhov kev ua haujlwm them nyiaj kub. Hloov chaw, ntsuas qhov kub ntawm cov tshuaj kom raug thiab ua qhov kev kho manually, lossis khaws cov qauv ntawm 25 ° C thaum ntsuas kom tshem tawm qhov xav tau kev them nyiaj.

III. Cov Txheej Txheem Kuaj Mob Sai Sai Rau Kev Txheeb Xyuas Qhov Tsis Zoo Hauv Cov Khoom Siv Kho Kub

1. Txoj Kev Tshawb Xyuas Sai rau pH Meter Kub Compensators
Ua ntej, calibrate lub pH meter siv ob lub standard buffer solutions los tsim kom muaj qhov slope kom raug. Tom qab ntawd, ntsuas lub standard solution thib peb uas tau ntawv pov thawj raws li cov xwm txheej uas tau them rov qab (nrog rau qhov kub thiab txias uas tau qhib). Piv qhov nyeem tau nrog rau tus nqi pH uas xav tau ntawm qhov kub thiab txias tiag tiag ntawm cov tshuaj, raws li tau teev tseg hauv "Verification Regulation for pH Meters." Yog tias qhov kev hloov pauv ntau dua qhov yuam kev siab tshaj plaws rau qhov chav kawm raug ntawm lub cuab yeej, lub temperature compensator tej zaum yuav ua haujlwm tsis zoo thiab yuav tsum tau kev tshuaj xyuas los ntawm cov kws tshaj lij.

2. Txoj Kev Tshawb Xyuas Sai rau Cov Khoom Siv Ntsuas Kub Conductivity Meter
Siv lub ntsuas conductivity uas qhib qhov kub thiab txias los ntsuas qhov conductivity thiab qhov kub ntawm cov kua uas ruaj khov. Sau cov nqi conductivity uas tau muab tso tawm. Tom qab ntawd, tua lub ntsuas kub thiab sau cov conductivity raw ntawm qhov kub tiag tiag. Siv cov coefficient kub uas paub ntawm cov kua, xam cov conductivity xav tau ntawm qhov kub thiab txias siv (25 °C). Piv cov nqi xam nrog cov ntsuas nyeem tau muab tso rau. Qhov sib txawv tseem ceeb qhia txog qhov ua yuam kev hauv cov txheej txheem lossis lub sensor ntawm kev them nyiaj kub, uas yuav tsum tau kuaj xyuas ntxiv los ntawm lub chaw kuaj mob metrology uas tau ntawv pov thawj.

Xaus lus, cov haujlwm them nyiaj kub hauv pH meters thiab conductivity meters ua haujlwm sib txawv heev. Hauv pH meters, kev them nyiaj kho qhov rhiab heev ntawm electrode kom cuam tshuam cov teebmeem kub tiag tiag raws li Nernst equation. Hauv conductivity meters, kev them nyiaj ua rau cov nyeem ntawv zoo li qub rau qhov kub thiab txias siv los ua piv txwv kom sib piv cov qauv. Kev tsis meej pem cov txheej txheem no tuaj yeem ua rau muaj kev txhais lus tsis raug thiab cov ntaub ntawv tsis zoo. Kev nkag siab zoo txog lawv cov ntsiab cai ua kom muaj kev ntsuas tseeb thiab txhim khu kev qha. Tsis tas li ntawd, cov txheej txheem kuaj mob uas tau teev tseg saum toj no tso cai rau cov neeg siv ua qhov kev ntsuam xyuas ua ntej ntawm kev ua haujlwm ntawm compensator. Yog tias muaj qhov tsis zoo tshwm sim, kev xa cov cuab yeej sai sai rau kev txheeb xyuas metrological raug pom zoo.