Working Principles of Open Cup Flash Point Tester and Closed Cup Flash Point Tester
Flash point is the bottom line of temperature at which a flammable liquid or solid releases enough vapor on the surface of the liquid or solid in the container used to form a flammable mixture with air. The flash point of a flammable liquid varies with its concentration.
As the temperature rises, the amount of oil and gas vaporized on the surface of the fuel increases. When the mixture of oil, gas and air reaches a certain concentration, when it comes into contact with an open flame, a brief flash (flashes and extinguishes) will occur, and the oil temperature at this time is called the flash point. The lighter the oil, the lower the flash point. The higher the flash point, the less dangerous it is.
There are two methods for determining flash point: open cup method and closed cup method.
The result of open cup measurement is called open flash point. (PS-KS403 automatic open flash point tester); the result of closed cup measurement is called closed flash point (PS-BS303A automatic closed flash point tester). The open flash point is always higher than the closed flash point, because the oil vapor produced by the open flash point tester can diffuse freely into the air and it is relatively difficult to reach a temperature that can flash. The flash point measured by the open cup method is 15-25°C higher than that by the closed cup method.
If you are interested in Open Cup flash point tester and Closed Cup Flash Point Tester, please feel free to contact us
