ASTM B499, ISO 2178, DIN 50981

Used to Measure:

• Non-magnetic coatings on ferro-magnetic substrates such as zinc, chromium, copper, tin, or paint, plastic, enamel on steel;
• Delta ferrite content austinetic weld metal or duplex steel

Test Method Basics

Contacting test method. A low frequency AC excitation current generates a low frequency magnetic field. The magnetic flux density depends on the distance between the measurement probe and the ferro-magnetic substrate. A probe output signal is gererated by means of a pick-up coil. In the instrument, the measurement signal is translated to coating thickness based on the probe characteristic and a suitable mathematical conversion model.