Analysis of various classification methods of laboratory instrumentation PH meter
There are many classifications of acidity meters. They can be classified according to different accuracy, and can also be classified according to reading index. They can also be classified according to the use environment and component type. The following list will introduce the main categories of acidity meters.
1. Accuracy classification
The pH meter instrument 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.
2. Classification of 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.
3. Classification of component types
It can be divided into transistor type, integrated circuit type and single-chip microcomputer type. Now 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.
4. According to the environment used
It can be divided into pen type PH meter, portable PH meter, laboratory PH meter and industrial PH meter.
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. The laboratory pH meter is a desktop high-precision analytical instrument that requires high precision and full functions, including printout, data processing, etc. Industrial pH meters are used for continuous measurement of industrial processes. They not only have measurement display functions, but also have alarm and control functions, as well as installation, cleaning, anti-interference and other issues.
