This equipment is used to detect pores and pinholes in electrically non-conductive protective coatings on metal or concrete using the High Voltage Method according to ISO 2746, ISO 8289 and DIN 28055.

Applications
• Pore testing in containers, oil tanks, agitator vessels, pipes, boilers, etc., lined with enamel or plastic
• On building seals, made of non-conductive coatings
• In the construction industry.

Suitable electrodes are available for every application. The desired electrode is simply screwed onto the test head.
The left picture shows the pore testing of an enamel coating of a boiler using a flat electrode.
The pore testing of interior pipe walls is done by means of rotating electrodes (left picture).
Some test samples like plastic foils etc. have the tendency for static charging. For this application the HV20D with dynamic monitoring of the high voltage in combination with a rubber roller electrode is ideally suited.
In this case the time gradient of the high voltage change is evaluated for pore detection instead of its absolute value, which is affected by the static charging.