The Sewerin Variotec 460 Tracer Gas Leak Detector identifies leaks in situations where acoustic methods cannot, such as in very deep pipes, noisy industrial environments, or where newly installed water systems fail air pressure tests. Detecting water leaks with tracer gas involves injecting a mixture of 95% nitrogen (N₂, the carrier gas) and <5% hydrogen (H₂) as the tracer. H₂ gas escapes through the leak and is detected above ground by the Variotec 460 instrument's sensitive sensor. H₂ tracer gas is non-toxic and non-corrosive, making it suitable for use in all drinking water systems. It is environmentally neutral and can permeate various covering layers such as asphalt, concrete, and other seal coats. Hydrogen (H₂) is the lightest and smallest element on the periodic table, ensuring it always takes the shortest path from the leak in the pipe to the surface, enabling the precise location of water leaks in any surface or ambient scenario.