The function of the "particle counter" is mainly to detect the quantity and distribution of solid particles in oil, and can also be used to monitor the filtration effect of filters. There are currently three types of particle counters on the market, which are introduced below: one is the "desktop particle counter", which is placed in the laboratory, has a large volume, high accuracy, and is very expensive; the disadvantage is that it can only be sampled and tested, cannot be moved, and costs around 250000 yuan, suitable for places with very high accuracy requirements. The market sales are very low. The second type is the "portable particle counter", which can be used in the laboratory or brought to the site for online measurement or sampling measurement. The operation is simple, the accuracy is also very high, and the price is moderate. It is in the market. The mainstream products on the market account for over 90% of the total sales. The third type is the "online particle counter", which is compact in size, installed on the host, has poor accuracy, and is also cheap, suitable for special occasions. Users can selectively purchase "particle counters" based on their intended use.

Particle counter is used to detect the size and quantity of various particles in oil. Particles have formed a discipline and are widely used in aviation, aerospace, navigation, power, petroleum, chemical, transportation, ports, metallurgy, machinery, automobiles, manufacturing and other fields to detect solid particle pollution in various types of oil. Particle counters are mainly used for oil analysis, which can monitor and analyze the particle size, cleanliness, and pollutants of oil; Hydraulic equipment and its daily maintenance and upkeep; Wear test of hydraulic components; Test for insoluble particles in pure solution and ultrapure water.