In recent years, the requirements for reliability and lifetime of industrial components have increased significantly. This is due both to customer requirements and the Total Quality philosophy that has been much more widely introduced. This development has had an impact especially on industrial leak detection, since this is one of the nondestructive testing techniques that has been at a rather low level both regarding the involved technologies and the training of personnel. Modern leak detectors that use test gases, especially helium, for testing components and systems have addressed these needs. In a most important first step, as early as 20 years ago, helium leak detectors did away with liquid nitrogen traps by introducing counter flow technology. This, together with the replacement of manual valves by electromagnetic ones controlled by a microprocessor, enabled operation by relatively unskilled persons in industrial processes.
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