Is the high voltage application destructive to any of the generally used sealing coatings?
A2. No! The applied voltage to the coating is non-destructive, provided the voltage applied is within the parameters set down in the Operator Handbook for the type and thickness of coating. Q3. It is noted that the PCWI Detector employs wire brush inspection electrodes and not wet sponges. What are the advantages of the wire brush electrodes and the limitations of the wet sponge electrodes? A3. Wire brush electrodes are faster to use, larger areas can be covered and there is no contamination from the water. Wet Sponge (cellulose) electrodes are used in low-voltage detectors, having an output of less than 100 VDC. The wet sponge method is not satisfactory for the detection of other than gross faults in thin film coatings, and is unsuitable for use where thicker coatings in excess of 150m have been applied.
