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Helium Detectors are used primarily in situations where sonic detection methods are not effective (inability to maintain pressure in the line or soil saturation). Instead of "listening" for the sound of escaping gas from the leak, the Helium Detector actually detects the leaking gas itself. Because Helium has a small molecular structure and rises it will often make its way to the soils surface very close to where the leak is. A Helium Detector identifies trace amounts of the gas and provides an indication to the user of its presence through an audible alarm and an LED bar graph.
 Although Helium can come right through concrete it may "pool" under the deck and make its way through nearby cracks or expansion joints first. In large expanses of concrete it may be helpful to drill small holes in the deck along the path of the line to help assure a more accurate location.
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