What are the minimum and maximum film thicknesses that can be tested with PCWI Detectors?
A3. This depends on the type of coating applied. Australian Standard AS3894.1-1991 states a minimum of 150m – see Operator Handbook for coatings/voltages relationship. Refer to Operating Instructions. Q4. It has been said that AC Porosity Detectors offering output ranges from 5 to 30kV at 1.5mA are preferable to direct DC units at high voltages, because direct DC Detectors may experience excessive voltage drop due to special conditions of testing, location, weather, testing object, or coating thickness etc. It is further stated that unlike high voltage direct DC types, with AC there is no danger of residual voltage discharges. How does this relate to PCWI Detectors? A4. They have a voltage sensor that holds the voltage to the desired level.
