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What is the significance of the acid value determined by an acid value tester? 1. The acid value determination using an acid value meter can help assess the performance of petroleum products. The acid value of diesel has a significant impact on the performance of diesel engines; diesel with a high acid value can lead to increased carbon buildup in the engine, causing piston wear and clogging of the nozzles. If the acidity is too high, it may be due to high levels of phenols or thiol compounds; this not only affects the color stability of petroleum products, but the harmful gases produced during combustion can also corrode machinery and pollute the environment. 2. The acid value tester can be used to determine the content of acidic substances in petroleum products, based on the level of acid value. Generally speaking, the higher the acid value of petroleum products, the more acidic substances they contain. Conversely, the lower the acid value, the less acidic substance is present. 3. The acid value determined by an acid value meter can be used to roughly assess the corrosive effect of petroleum products on metals. Petroleum products contain low levels of organic acids, and in the absence of moisture and at low temperatures, they do not cause corrosion to metals. However, when their concentration is high or when moisture is present, they can corrode metals. The smaller the organic acid molecule, the stronger its corrosiveness. 4. The acid value tester can be used to determine the degree of deterioration of the lubricating oil in use, based on its acid value. After being used for a period of time, lubricating oil gradually deteriorates due to oxidation, as indicated by an increase in its acid value. When the acid value exceeds a certain limit, it is necessary to replace it with fresh oil.