Oerlikon Leybold Vacuum received an order from CERN, the European Organization for Nuclear Research, for the delivery of more than 50 mobile leak detection systems. Researchers at CERN in Geneva are examining what holds the world together, and the world's largest super accelerator, LHC (Large Hadron Collider), is the heart of the major research institution. For the experiments at the LHC, it is imperative to maintain a pure ultrahigh-vacuum continuously in the 27-km-long underground pipeline. Accordingly, the helium leak detection at CERN is a mission-critical application. In addition to the particle accelerator at CERN, the leak detectors are used in leak testing of the large ATLAS detector, the CMS (Compact Muon Spectrometer) and individual components used for antimatter research.