Peb qhov tseem ceeb ntawm pH meter qauv
1. Ib tug siv electrode;
2. Ib lub iav electrode uas nws lub peev xwm nyob ntawm pH ntawm cov tshuaj nyob ib puag ncig;
3. Ib qho ammeter uas tuaj yeem ntsuas qhov sib txawv me me hauv Circuit Court nrog kev ua haujlwm siab heev.
Cov hauv qab no yog cov lus piav qhia ntawm lub luag haujlwm tseem ceeb ntawm txhua qhov khoom siv:
1. Lub luag haujlwm tseem ceeb ntawm cov khoom siv electrode yog tswj kom muaj peev xwm tsis tu ncua raws li kev tswj xyuas kev ntsuas ntau yam sib txawv ntawm qhov muaj peev xwm. Silver-silver oxide electrode yog tam sim no feem ntau siv siv electrode hauv pH.
2. Kev ua haujlwm ntawm cov iav electrode yog tsim kom muaj qhov sib txawv uas teb rau cov kev hloov hauv hydrogen ion kev ua ntawm cov tshuaj ntsuas. Muab cov pH-rhiab electrode thiab cov ntaub ntawv siv electrode hauv tib txoj kev daws teeb meem ua ib lub xov tooj tseem ceeb. Lub peev xwm ntawm lub xovtooj yog qhov algebraic sum ntawm lub peev xwm ntawm cov iav electrode thiab cov khoom siv electrode. E roj teeb=E siv E iav. Yog tias qhov kub thiab txias tsis tu ncua, lub peev xwm ntawm cov roj teeb no hloov nrog pH ntawm cov tshuaj yuav tsum ntsuas. Nws yog ib qho nyuaj rau kev ntsuas lub peev xwm tsim los ntawm lub roj teeb nyob rau hauv pH meter vim hais tias lub electromotive quab yuam yog heev me me thiab Circuit Court impedance loj heev, 1-100MΩ; yog li ntawd, lub teeb liab yuav tsum tau amplified txaus los tsav ib tus qauv millivoltmeter los yog milliammeter.
3. Kev ua haujlwm ntawm ammeter yog txhawm rau ua kom lub peev xwm ntawm cov roj teeb qub ob peb zaug. Lub teeb liab amplified yog tso tawm los ntawm ammeter. Qhov degree ntawm deflection ntawm ammeter pointer qhia lub zog ntawm lub teeb liab nws tsav. Rau kev siv xav tau, lub dial ntawm pH ammeter yog engraved nrog tus nqi pH sib xws; thiab cov pH meter ncaj qha qhia tus nqi pH hauv cov lej.
