Flash point tester is a key equipment used to determine the flash point of liquids or gases, and its working principle is based on the volatility and flammability of liquids. When a liquid sample is subjected to a heat source, its volatile components gradually evaporate, forming flammable gases. When these gases are mixed with air to a certain concentration, they can produce a flash or flame upon encountering an ignition source, and the temperature at this point is the flash point.

A flash point tester typically consists of a sample chamber, heating system, ignition source, temperature control system, temperature sensor, and data recording system. During the testing process, the sample to be tested is first placed in the sample chamber and heated by a heating system to gradually increase its temperature. During the heating process, the temperature control system ensures the stability and accuracy of the temperature, while the stirring system ensures uniform sample temperature and promotes the formation of surface vapor on the sample.

When the sample temperature approaches the flash point, an ignition source (such as an electric spark) will be introduced onto the surface of the sample. If the concentration of the mixture of sample vapor and air reaches the flammable range, the ignition source will cause instantaneous flash fire. At this point, the detection system will capture the release of light or heat and automatically record the current temperature, which is the flash point of the sample. The data recording system saves the test results for subsequent analysis and comparison.

According to different testing methods, flash point testers can be divided into open flash point testers and closed flash point testers. The open flash point tester is suitable for non-volatile liquids, while the closed flash point tester is used for volatile liquids such as kerosene, diesel, etc. It reduces the influence of external factors on the test results through testing in a closed container.

The flash point tester has a wide range of applications in the fields of petrochemicals, transportation safety, etc. It is an important tool for evaluating the flammability and explosion hazards of liquids.