The application of the acidity meter has become more and more extensive, and people are also very concerned about the quality of the acidity meter in use. So how should the user judge the quality of the acidity meter? Today we will specifically introduce the method of judging the quality of the acidity meter, hoping to help users better apply the product.
The acidity meter, also known as the pH meter, is a commonly used instrument, which is mainly used to accurately measure the pH value of the liquid medium. It can also measure the ion electrode potential MV value by matching the corresponding ion selective electrode. It is widely used in environmental protection, sewage treatment, scientific research, pharmaceutical, fermentation, chemical, aquaculture, tap water and other fields. The instrument is also an essential inspection equipment in the QS and HACCP certifications of food factories and drinking water plants.
First, the technical aspects:1. The manufacturing process of the acidity meter: A good acidity meter is very stressful on the production process, mainly in the internal circuit and components. There are many inferior manufacturers. The low-cost production of the acidity meter has a messy internal circuit and component quality. Inferior, such products simply cannot guarantee the correct stability and safety of the instrument.
2. The design principle of the acidity meter: The design principle of the product is the core of the instrument. The excellent product design can reduce the cost without giving up the pursuit of precision. In fact, the most critical difference is the analog circuit and the numerical circuit, due to the development of technology. And the price reduction of the single-chip microcomputer makes the current numerical circuit become the mainstream product, and the advantage that he possesses is also incomparable to the analog circuit.
1. Accuracy: The acidity meter without accuracy has no use value. The way to judge is to use a high-precision instrument or a high-precision standard solution.
2, stability: an unstable acid meter reading is difficult, it is difficult to ensure the accuracy of the instrument, stability in two aspects, on the one hand is the stability of a single instrument, you can put the same instrument for a long time to stabilize the solution In the middle, see if the value changes and the range of change; on the other hand, the stability of multiple instruments, put several calibration instruments of the same type in the same stable solution to see if the readings are consistent, how many errors, if several models of the same type Stability cannot be guaranteed between instruments, so it is difficult to ensure the accuracy and stability of each instrument.
3. Adjustment of common error: Temperature is the most obvious factor causing PH error. The presence or absence of temperature probe and the sensitivity of temperature probe also affect the use of the instrument.
4, easy to operate, beautiful interface: the user is relatively easy to judge this aspect, some old-style instruments, using analog switches, resulting in difficult calibration, small changes are not easy to detect, prone to fatal system errors. On the other hand, considering the cost and technical reasons, there are still many instruments using LED digital tubes, and the display content is not rich enough. Of course, some manufacturers have made up for this shortcoming through certain means. At present, the more convenient operation interface is generally LCD liquid crystal display + keyboard operation.
5, the pros and cons of the probe: This point is undoubted, the performance of the probe directly affects some of the technical indicators of the instrument, and the superior instrument equipped with inferior probes will not help.
6. Safety: In recent years, more and more customers have begun to pay attention to operational safety. Well-designed instruments with lower safety voltage input can greatly improve safety performance.
First, the accuracy of the measurement of the acidity meter. This is the first consideration for the user. If the basic accuracy of a acidity meter is not guaranteed, then its quality will not be discussed.
Second, the stability of the acidity meter. What is the stability of the acidity meter? When the pH value is measured with a pH meter, the measurement results should be stable and cannot fluctuate greatly. Imagine if the reading of the acidity meter jumps up and down when testing, it is not stable, so how to ensure the accuracy of the reading.
Third, the acidity meter function. For example, the temperature compensation function, because the temperature will affect the measurement of the pH value, so before choosing the acidity meter, we have to see if there is temperature compensation. For example, METTLER's acidity meter is usually equipped with a temperature probe, which can be set to compensate for the effect of temperature on the temperature measurement result. Of course, there are other functions that need to be considered, such as automatic, manual endpoint determination, automatic buffer identification, instrument self-test function, and so on.
Fourth, the operability of the acidity meter. This depends on personal habits. Some manufacturers' acid meters are more complicated, and there are more buttons, but the labels are clear and easy to master. Some manufacturers have less operation buttons for the pH meter and more than one button. Some manufacturers' acidity meter structure is relatively simple, easy to install, and the display is relatively intuitive.
5. The pH of the acidity meter pH electrode. The performance of the electrode will affect the overall performance of the pH meter. It is like the antenna of a mobile phone. If the antenna is broken, the basic call function is lost. If the electrode of the acidity meter is broken, it loses its basic detection ability.
Sixth, the safety of the acidity meter. Whenever an AC power detection instrument is used, we must consider its safety. If the supply voltage of the acidity meter is converted into DC power, it will enter the instrument, which greatly improves the safety of the acidity meter.
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