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Gießen, Germany

Jitschin W.,Labor fur Vakuumtechnik | Farangis B.,Labor fur Vakuumtechnik
Vakuum in Forschung und Praxis | Year: 2014

Leak localization and tightness control with Helium provides a very sensitive testing method. Frequently, the sensitivity of a leak has to be testspecified quantitatively. In particular, quality control requires a reliable verification of the sensitivity. For this purpose, test leaks with well-known leakage are used. In the article, various types of test leaks and their properties are described. Test leaks are commercially available over a wide range of leak rates. Their leakage flow can be calibrated with good accuracy. In the usage of the test leaks, the temperature-dependency of the leak rate has to be taken into account, as well as the slow decrease of the leak rate due to the continuous loss of gas from the reservoir. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Jitschin W.,Labor fur Vakuumtechnik | Farangis B.,Labor fur Vakuumtechnik
Vakuum in Forschung und Praxis | Year: 2013

Functionality, safety and environment protection require the tightness of equipment against atmosphere. To check for possible leaks, commercial leak sniffers are commonly used. In order to warrant the reliability of leak testing, the sniffers must work properly with correct sensitivity at usage. To prove the proper operation of the leak sniffer, test leaks with known leak rates are used. The present paper deals with design and calibration of the test leaks, in particular for very small leakage. © 2013 WILEY-VCH verlag GmbH & Co. kGaa, Weinheim. Source

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