1. Laboratory pH meter: The laboratory pH meter is a desktop high-precision analytical instrument that requires high precision and full functions, including printout, data processing, etc.
2. Industrial pH meter: Industrial pH meter is used for continuous measurement of industrial processes. It not only has measurement and display functions, but also has alarm and control functions, as well as installation, cleaning, anti-interference and other issues.
3. Classification of gauges:
(1) Classification according to the application occasion: it can be divided into pen type PH meter, portable PH meter, laboratory PH meter and industrial PH meter, etc. The pen-type pH meter is mainly used to replace the function of pH test paper, and has the characteristics of low precision and convenient use. Portable pH meters are mainly used for on-site and field measurements, requiring high precision and perfect functions.
(2) According to the classification of instrument accuracy: it can be divided into 0.2 level, 0.1 level, 0.02 level, 0.01 level and 0.001 level. The smaller the number, the higher the accuracy.
(3) Classification according to the reading indication: it can be divided into two types: pointer type and digital display type. Pointer pH meters are rarely used now, but pointer meters can display the continuous change process of data, so they are still used in titration analysis.
(4) Classified according to the type of components: it can be divided into transistor type, integrated circuit type and single-chip microcomputer type. Nowadays, more microcomputer chips are used, which greatly reduces the size of the instrument and the cost of a single machine; but the development cost of the chip is very expensive.