Wet Sponge Pinhole Detector

About Wet Sponge Pinhole Detector

Wet Sponge Pinhole Detector

This is also known as Wet Sponge Holiday Detector or Wet Sponge Pinhole Detector or Low Voltage Holiday Detector. The multi-voltage pinhole detector, which uses the wet sponge principle to detect through pinholes, cracks and damaged areas in protective coatings up to a maximum thickness of 500 microns. Pinhole Detectors or wet sponge tester detects pinholes, voids, thin spots, foreign inclusions, or contamination in coatings film. Dielectric strength of film also referred as holiday detection.

Model PD-990 is a low voltage holiday detector / wet sponge tester operation is by the application of a wet sponge to the coating. The wetting agent penetrates any pinhole and makes a conductive path through to the substrate, the pin hole detector automatically detects this conductive path and sounds an audible alarm and also gives a visual warning by a flashing red indicator that a pinhole fault has been detected. The flaw can now be marked for repair and further testing resumed. Coating on metals prevents to corrode unless a protective coating is applied. Pinholes based on wet sponge method generally caused by air entrapment that is then released from the surface, or by the entrapment of particulates (dust, sand, etc.), which do not stay in place. High voltage holiday detector is used for testing coatings above 500m and low voltage holiday detector (Pinhole Detector ) is used below 500µm of coating on metallc substrates.

Intuitive Design for Field Efficiency

This Wet Sponge Pinhole Detector boasts a lightweight, handheld form with a textured grip, allowing for prolonged use during inspections. The sponge probe, with a 25mm diameter, glides smoothly across coated surfaces to probe for pinholes, providing instant audible and visual indications when flaws are detected. Its splashproof ABS plastic construction ensures resilience in tough environments, making it ideal for professionals on the move.


Compliant and Reliable Performance

Meeting ASTM D5162 and NACE SP0188 standards, this detector ensures trustworthy results for industrial coating inspections. It delivers quick, precise results with a high 5% accuracy rate and a fine 1 m resolution. Automatic shutoff and low power consumption together guarantee consistent performance and extended battery life for demanding projects.


Comprehensive Accessories and Easy Maintenance

Included accessories are a sponge wand, a 1.5-meter test lead, a solution bottle for easy wettability, replacement sponges, and a protective carrying pouch. The device's sponge-based conductivity sensor is simple to maintain, letting users replace sponges as needed for optimal sensitivity during repeated operations.