How to choose a pH meter?
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When purchasing a pH meter, we must first consider the application, choose a pen pH meter, a portable acidity meter, a benchtop acidity meter or an industrial pH meter. Secondly, consider the accuracy required for the measurement and choose the accuracy that is suitable for your own use.
pH meters are widely used in industrial, electric power, agriculture, medicine, food, scientific research and environmental protection. The instrument is also an essential inspection equipment in the food factory, drinking water factory QS, HACCP certification.
We need to consider the following points when purchasing acidity timing:
1. According to the application classification, it can be divided into: pen 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 the pH test paper, and has the characteristics of low precision and convenient use.
Portable pH meters are mainly used in field and field testing methods, requiring high precision and perfect functions.
The laboratory pH meter is a benchtop high-precision analytical instrument that requires high precision and full functionality, including printouts, data processing, and more.
Industrial pH meters are used for continuous measurement of industrial processes, 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 accuracy of the pH meter instrument classification: can be divided into 0.2, 0.1, 0.05, 0.01, the smaller the number, the higher the accuracy.
3. According to the component type classification: can be divided into transistor type, integrated circuit type and single-chip microcomputer type, now more is the application of microcomputer chip, greatly reducing the instrument volume and stand-alone cost; but the development cost of the chip is very expensive.
4. According to the reading indication classification: it can be divided into two types: pointer type and digital display type. Pointer pH meters are now rarely used, but pointer meters are capable of displaying continuous changes in data and are therefore used in titration analysis.
5. See if the pH meter has any additional functions, for example, with the standard RS232 interface, there is also a very heavy temperature compensation is automatic or manual, automatic temperature compensation pH meter is more convenient than manual temperature compensation pH meter, You will understand the price between the two.
Remarks: The three names of pH meter, acidity meter and acidity meter are the same, but different places or manufacturers say differently!