Transcription of Basics of Helium Leak Detection with Pfeiffer Vacuum
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Basics of Helium Leak Detection with Pfeiffer Vacuum
1 HAG_0303 Basics of Helium Leak Detection with Pfeiffer Vacuum2 HAG_0303 What are the reasons for Leak Detection ? Environmental protection and their constraints or legal standards Industrial norms and partially detailed specifications of the customers Optimization of the process Quality Management3 HAG_0303 The denseness requirements are in general quantizised by the maximum allowable leak rate. Types:zPressure increase in a Vacuum - reservoirzPressure decrease in a pressure - tankLeak ratePo> PiPo< PiPiPoV4 HAG_0303 DefinitionThe leak rate value is 1 mbar l/sif in a Vacuum - reservoir with a volume of 1 Litrethe pressure rises in 1 Secondabout 1 mbaror in a pressure - reservoir it drops about 1 mbar. Unitz[mbar l/s]zSI Units:[Pa m3/s]zFluid Technology:[sccm; sccs]zClimate Technology:[g/a; oz/y]Leak rate5 HAG_0303 Example: leak rate in mbar l/s The wheel of a bicycle allows in 175 days a maximum pressure drop of 1000 mbar without pumping up!
7 HAG_0303 Example: leak rate in mbar l/s ¾Testing of Car tires ¾Testing method: manual underwater – sight check (Bubble test) ¾Test conditions: testing – pressure and – temperature constant
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