Coatings & Industry > Physical properties > Porosity & Permeability
Low Voltage Holiday Detector : Pinhole Tester 9V/67.5V/90V
ISO 29601: Paints and varnishes. Corrosion protection by protective paint systems. Assessment of porosity in a dry film.
The Pinhole Detector uses the wet sponge principle to detect through-pinholes, cracks and damaged areas on non-conductive coatings on conductive substrates.
These flaws would eventually lead to corrosion and premature failure of the coating.
Operation is by a wet sponge, moistened with a wetting agent, being moved over the coating.
The wetting agent penetrates any pinhole and makes a conductive path through to the substrate.
The Pinhole Detector detects this conductive path and indicates that a pinhole has been detected by sounding an audible alarm and giving a visual warning by a red flashing indicator.
The Pinhole Detector has test voltages of 9 Volts, 67.5 Volts and 90 Volts, which are easily selectable.
The Calibration Certificate with traceability to UKAS is an optional extra. The Certificate is supplied as hard copy.
Supplied in an industrial foam-filled Carrying Case with 150mm Sponge Assembly and 5m Earth Cable.
Pinhole Detector Specifications
Part No Range Maximum Test Thickness Maximum Test Thickness Maximum Test Thickness Accuracy Cal Cert
9V 67.5V 90V Part No
274-S3002 9V/67.5V/90V 300µm 500µm 500µm 1% 274-NS002
274-SA005 Earth Cable 20m
274-SS004 Spare Earth Cable 5m
274-SS005 Spare Sponge Assembly 150mm
Pinhole Circular Sponges for the testing of internal diameter of pipes.
Part No Product Size Extension
274-SA601 Circular Sponge and Assembly 50mm 200mm
274-SA602 Circular Sponge and Assembly 100mm 200mm
Supplied in an industrial Carrying Case with Sponge Assembly and 5m Earth Cable.
Calibration Certificate is an optional extra.