Classification and components of the pH meter

The classification and composition of the acidity meter, what kind of acidity meter/PH meter, and how is it divided? The pH meter can generally be classified according to the application, instrument accuracy, reading indication, and component type:

(1) According to the application category: can be divided into pen PH meter, portable PH meter, laboratory bench PH meter and industrial PH meter. Pen pH meter is mainly used to replace the function of pH test paper, with low accuracy and easy to use features. The portable pH meter is mainly used for on-site and field test methods, requiring higher accuracy and improved functionality. The laboratory pH meter is a desktop high-precision analytical instrument that requires high precision and full functionality, including some printouts, data processing, and so on. Industrial pH meters are used for continuous measurement of industrial processes. They not only have measurement display functions, but also alarm and control functions, as well as installation, cleaning, anti-interference, and other issues.

(2) According to the instrument accuracy classification: can be divided into 0.2, 0.1, 0.02, 0.01 and 0.001 level, the smaller the number, the higher the precision.

(3) Classification according to reading instructions: It can be divided into two types: pointer type and digital display type. Pointer pH meters are rarely used today, but pointer meters can show continuous changes in data and are therefore used in titration analysis.

(4) According to the classification of component types: can be divided into transistor type, integrated circuit type and single chip microcomputer type, and now more is the application of microcomputer chips, which greatly reduces the instrument size and stand-alone costs, but the development cost of the chip is very expensive.

What are the components of the pH meter/PH meter? pH meter potentiometric measurement is the most precise method of measuring pH. The pH meter consists of three components:

(1) A reference electrode: maintain a constant potential as a control for measuring various deviation potentials;

(2) A glass electrode: its potential depends on the pH of the surrounding solution;

(3) An ammeter: This ammeter can measure a small potential difference in an extremely resistive circuit. The main body of the pH meter is a precision potentiometer. When measuring, the composite electrode is inserted in the solution to be measured, different electromotive force is generated due to the difference in acidity (hydrogen ion concentration) of the solution to be measured, it is amplified by a DC amplifier, and finally the measured solution is indicated by a reading indicator (voltage meter). The pH value.