Analysis of the reasons for the deviation of the open flash point tester

When the open-mouth flash point tester is measuring oil, its measurement results are slightly high or repeatable, why is this? The next Beijing Xinsheng Zhuorui Technology Co., Ltd. technical staff will briefly introduce you to use the open flash point tester to determine the oil, there will be a part of the steam freely dispersed into the air, resulting in the test results show errors. Also related to the amount of test oil to participate in: the amount of oil is small, the measured results are higher than normal, because the amount of oil will affect the volume of space above the liquid surface, affecting the concentration of oil vapor and air mixture.

Related to the size of the flame used for burning, the concavity of the liquid surface and the moment of stay, the diameter of the spherical flame used for burning is larger than normal, the measured results are low, and vice versa, higher than normal. Related to the heating speed: when the heating speed is too slow, the measurement time is long, burning more times, consuming part of the oil vapor, delaying the time to make the oil vapor and air mixture to reach the flash fire concentration, so that the results are high.

Related to atmospheric pressure: the flash point of the oil and external pressure, gas pressure is low, the oil is easy to volatilize, the measured flash point is low, and vice versa the measured flash point is high, if the atmospheric pressure is high, the measured flash point needs to do atmospheric pressure batching. In addition, the open flash point tester to determine the oil, the results are also related to the water content of the sample: the sample contains water, it is necessary to carry out dehydration, before the flash point determination.