Hold the sniffer probe perpendicular to the test object. In operation, as the probe tip is drawn over the exterior of the test object, it samples the atmosphere adjacent to the test object surface. Helium escaping from a leak, will be drawn into the probe tip and pass into the Leak Detector through the connecting tubing where it becomes visually evident on the leak rate meter.
When probing products for general leakage location, always start leak probing from the lowest point on the product and proceed systematically to the highest point. This will prevent an unusual reading if a large leak is present at the lowest point and rises up.