Kev faib tawm ntawm pH ntsuas _Kev ua haujlwm ntawm pH ntsuas
Kuj hu ua pH meter, acid-base detector, nws yog ib qho cuab yeej siv pH qhia electrode los ntsuas pH tus nqi ntawm kev daws los ntawm txoj kev potentiometric. Nws yog ib qho precision hluav taws xob millivolt meter tsim los siv nrog ion xaiv electrodes. Txij li thaum lub peev xwm ntawm pH qhia electrode hloov nrog kev hloov ntawm pH tus nqi ntawm cov tshuaj, thaum lub pH qhia electrode (xws li pH iav electrode) thiab siv electrode (xws li saturated calomel electrode) yog immersed nyob rau hauv cov tshuaj los tsim ib tug. ntsuas roj teeb, lub zog electromotive generated Nyob ntawm tus nqi pH ntawm cov tshuaj. Lub pH meter converts lub zog electromotive tso zis rau hauv pH nyeem ntawv. Txhua lub sijhawm pH yog sib npaug rau 2.303RT/F volts. Tus nqi no hloov nrog qhov ntsuas kub ntawm cov tshuaj hauv cov ntsuas roj teeb. Yog li ntawd, lub pH meter yog nruab nrog ib tug kub them nyiaj qhov rooj. Kho nws kom ua Qhov kev hloov ntawm electromotive quab yuam ntawm txhua lub sijhawm pH yog qhov sib npaug ntawm qhov ntsuas kub. Lub pH meter kuj tau nruab nrog lub chaw tswj hwm qhov chaw, nws txoj haujlwm yog ntxiv qhov tsim nyog rau lub roj teeb hluav taws xob ua kom lub ntsuas pH nyeem raws li tus qauv pH tus nqi. Nyob rau hauv txoj kev no, tus nqi pH ntawm cov tshuaj yog tso tawm ncaj qha rau ntawm lub 'meter'. Kev ntsuas dav dav ntawm pH meter yog pH 0 ~ 14, thiab nws tau nruab nrog ± mV thaiv kom nthuav dav ntau yam kev siv.
Classification ntawm pH meters
1. Kev faib cov meters
(1) Kev faib tawm raws li daim ntawv thov: nws tuaj yeem muab faib ua cwj mem pH meter, portable pH meter, kuaj pH meter thiab industrial pH meter, thiab lwm yam. ntawv. Nws muaj cov yam ntxwv ntawm qhov raug qis thiab siv tau yooj yim. Portable pH meters feem ntau yog siv rau ntawm qhov chaw thiab kev ntsuas kev ntsuas, uas yuav tsum tau muaj qhov tseeb thiab ua tiav cov haujlwm.
(2) Raws li kev faib tawm ntawm qhov ntsuas qhov tseeb: nws tuaj yeem muab faib ua qib 0.2, qib 0.1, qib 0.02, qib { {9}}.01 thiab qib 0.001. Tus lej tsawg dua, qhov tseeb dua.
(3) Kev faib tawm raws li kev nyeem ntawv qhia: nws tuaj yeem muab faib ua ob hom: hom pointer thiab hom duab digital. Pointer pH meters tsis tshua muaj siv niaj hnub no, tab sis cov ntsuas ntsuas ntsuas tuaj yeem tso saib cov txheej txheem hloov pauv tas li ntawm cov ntaub ntawv, yog li lawv tseem siv hauv kev tshuaj xyuas titration.
(4) Kev faib tawm raws li hom kev tivthaiv: nws tuaj yeem muab faib ua hom transistor, integrated circuit type thiab single-chip microcomputer type. Niaj hnub no, ntau lub microcomputer chips tau siv, uas txo qis qhov ntsuas ntim thiab tus nqi muag ib leeg; tab sis tus nqi tsim tawm ntawm cov nti yog kim heev.
2. Laboratory pH meter: Lub chaw kuaj pH meter yog lub desktop high-precision analytical instrument uas yuav tsum tau muaj kev ua haujlwm siab thiab ua tiav tag nrho, suav nrog kev luam tawm, cov ntaub ntawv ua haujlwm, thiab lwm yam.
3. Industrial pH meter: Industrial pH meter yog siv rau kev ntsuas tas li ntawm cov txheej txheem kev lag luam. Nws yuav tsum tsis tsuas yog muaj kev ntsuas thiab tso saib kev ua haujlwm, tab sis kuj muaj lub tswb thiab tswj kev ua haujlwm, nrog rau kev txiav txim siab rau kev teeb tsa, ntxuav, tiv thaiv kev cuam tshuam thiab lwm yam teeb meem.
