A leak detector having a multi-stage concentrator, consisting of an array of heater elements which desorb analytes in a phased manner, in synch with the sample stream, to maximize sensitivity. The heater elements of the concentrator are coated with adsorber material on both sides of the heater elements,...http://www.google.es/patents/US6792794?utm_source=gb-gplus-sharePatente US6792794 - Low power gas leak detector
