PINHOLE / HOLIDAY DETECTOR
After a protective coating has been applied, it is important to ensure there are no defects or discontinuities present that expose the substrate beneath. Small areas of thin or missing coating, called ‘pinholes’ or ‘holidays’, can become foci for corrosion and drastically reduce the life of a protective coating system. A pinhole or holiday detector is a non-destructive instrument used for detecting discontinuities in a coating system including holidays, pinholes, and cracks. Other names include porosity detector, continuity tester, holiday tester, spark tester, and jeep meter.
The PosiTest LPD Low voltage Pinhole Detector uses wet sponge to detect holidays, pinholes, and other discontinuities on metal and concrete substrates with four regulated voltage output options for coatings up to 500 µm (20 mils).
The PosiTest HHD High voltage Holiday Detector uses pulse DC technology to detect holidays, pinholes, and other discontinuities on metal and concrete substrates. User adjustable voltage range from 0.5 to 35 kV for coatings up to 20 mm (780 mils).