In the purchase of acidity instrument, we must first consider the applications, select the pen type pH meter, portable acidity meter, pH meter or desktop is pH meter industry; second is to consider the accuracy of measurement needs, choose appropriate use of precision.
PH meter is widely used in industry, electric power, agriculture, medicine, food, scientific research and environmental protection. The instrument is also the necessary inspection equipment for QS and HACCP certification in food factories and drinking water plants.
We need to consider the following points in choosing the acidity timer:
1. according to the application classification can be divided into: pen type pH meter, portable pH meter, laboratory pH meter and industrial pH meter, etc.. Pen type pH meter is mainly used to replace the function of pH test paper. It has the characteristics of low precision and easy to use.
Portable pH meter is mainly used in field and field measurement, requiring higher precision and perfect function.
Laboratory pH meter is a desktop high precision analysis instrument, which requires high precision and complete functions, including print output, data processing and so on.
Industrial pH meter is used for continuous measurement of industrial process, not only to measure and display functions, but also to alarm and control functions, as well as installation, cleaning, anti-interference and so on.
2. according to pH meter precision classification: can be divided into 0.2 levels, 0.1, 0.05, 0.01, the smaller the number, the higher the accuracy.
According to the 3. types of classification can be divided into components: transistor, integrated circuit and single chip microcomputer, now more is the application of the microcomputer chip, greatly reducing the volume of the instrument and single chip development costs; but the cost is very expensive.
4. according to the reading indication classification: can be divided into pointer and digital display two kinds. Pointer type pH meter is rarely used now, but pointer instrument can display the continuous change process of data, so it is also used in titration analysis.
5. see pH there is no incidental function, for example with the standard RS232 interface, there is a very important is the temperature compensation is automatic or manual, automatic temperature compensation of pH to more convenient than manual temperature compensation of the pH, between the two price you will understand.