Sanko Pinhole and Holiday Detectors detect pinholes, holidays,similar defects, etc. in insulated films applied to a metallic substrate.
Pinholes and holidays remarkably decrease anti-rust and anti-corrosive effects of various insulating films, coatings and linings.
These Detectors microscopically catch various defects, so that pollution, contamination, a loss of resource and energy caused by corrosion,etc. can be previously prevented.
When the insulating film(Dielectric) having a small penetrating hole is placed between the electrodes and the high voltage is loaded in the electrodes, the insulation of the air is broken and the electric current will flow with discharge.
Pinholes and holidays are detected with the detector which reacts to the change of the electric current affected on the discharge phenomenon.