Coating pinhole detector 270 series

wet spongelow-voltage

The Elcometer 270 Pinhole Tester range utilises the wet sponge technique and has been designed to set a new standard for wet sponge pinhole detectors. The Elcometer 270 Pinhole Tester is a high quality, low voltage detector and is supplied with similar accessories to a high voltage spark tester. • Supplied ready to use • Automatic sensitivity calibration and voltage checks • Low battery indicator • Visual and audible alarms • Integral and separate wand functionality • A wide range of fully interchangeable wand accessories • Easy release snag proof cables • Large standard sponge • An inspection kit for all your requirements is available. When testing for pinholes on thin coatings, powder coatings, and other applications where you do not wish to damage the coating; typically the wet sponge technique, also known as the low voltage pinhole method, is used. The wet sponge pinhole testing technique is a quick and simple method for testing insulation coatings less than 500 microns (20 mils) thick on conductive substrates. Put simply, a low voltage no bigger than 90 volts is applied to a damp sponge. When you pass the sponge steadily over the coating, liquid from the sponge is drawn through any pinholes by capillary action; and when it touches the bare substrate, the current flows from the detector, through the substrate, and back to the detector through a signal return lead, which is clipped to an uncoated section of the substrate. This completes a low voltage circuit, setting off an alarm on the detector, letting you know where you have a pinhole.