Dear experts, what is the difference between pumping under vacuum with a sealed system and pumping with an open system when testing vacuum pumps? Test the above ones separately?
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Dear experts, what is the difference between pumping under vacuum with a sealed system and pumping with an open system when testing vacuum pumps? Test the above ones separately?
The so-called sealed pumping test is used to determine the ultimate vacuum level, while the open pumping test is used to determine the maximum pumping rate. These are two important performance parameters of vacuum pumps. For most vacuum pumps, an inlet pressure is specified; this pressure varies depending on the type of vacuum pump. In reality, the system is not completely open, and not all vacuum pumps can directly draw in atmospheric air. Therefore, a certain value for the ultimate vacuum is set as a criterion for testing the maximum pumping capacity, and the maximum pumping rate under normal pressure is determined through calculations