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A Holiday Detector, also known as a Porosity Detector or Pinhole Detector, is an essential inspection instrument designed to detect pinholes, cracks, and discontinuities in protective coatings applied over conductive substrates. The instrument functions by applying a high voltage across the coated surface using a probe. When the probe encounters a defect in the coating, an electrical path is established, triggering an audible and/or visual alarm.
These detectors are widely utilized in quality control for coatings on pipelines, tanks, and metal structures to ensure the integrity of anti-corrosive layers before installation or service use.
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