There are usually two methods for measuring pH in aqueous solutions, colorimetry (pH strips and cuvettes) and potentiometry. The potentiometric method is the only method that can realize continuous on-line measurement and process monitoring, and the potentiometric method can obtain accurate and reproducible pH value. The core theory of pH electrode measurement is the Nernst equation.
The electrode used for potential analysis is called primary cell. The primary battery is a system whose role is to convert chemical reaction energy into electrical energy. The voltage of this battery is called electromotive force (EMF). This electromotive force (EMF) consists of two and a half cells. One of the half cells is called a measuring electrode and its potential is related to a specific ion activity; the other half cell is a reference half cell, usually called a reference electrode, which is generally connected to a measuring solution and is connected to a measuring instrument. . The most familiar and commonly used pH indicator electrode is a glass electrode.
An industrial on-line pH measurement system usually consists of four parts: a pH sensor, ie, a pH electrode, a pH transmitter, an electrode sheath, and a cable.
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