296 Wet and Dry Film Thickness Gauge
- Brand
- ERICHSEN
- Model
- 296
- Origin
- Germany
- Industries
- Coatings
Features
Simple to operate.
Complies with ISO 2808, ASTM D 1005, BS 3900 : C5, Rossmann
Application
All flat surfaces
Test principle
Dry film thickness: as with the Model 233, the D value of a dry coating is the distance between a retractable test pin (1) and two feet (2) that rest on the coating surface.
Wet film thickness: the D value of a wet coating is measured by manually adjusting the test pin (1) so that it passes through the coating and rests on the substrate, again with two feet (2).
Design and function
The height difference (D) between the surface of a wet coating and the substrate is measured by manually adjusting the pin (1) and two feet (2) so that they pass through the coating and rest on the substrate.
Design and function
A knurled nut on top lets the pin move freely. The pin can be set below or above the feet.
Test procedure
Dry film thickness: after zeroing, choose a measuring point and carefully cut a hole just big enough for the test pin (about 3 mm in diameter), deep enough to expose the substrate without cutting into it. Place the gauge over the area so that the test pin touches the bare substrate; the dry film thickness can then be read directly from the dial in micrometres (µm). If the coating is soft, put razor blades under the feet to make it firmer and more accurate; measure the blade thickness beforehand.
Wet film thickness: first raise the test pin with the knurled nut until it reads 0.5 mm above the feet. Then place the gauge on the wet coating with the feet resting on the substrate, and lower the test pin slowly with the nut until it touches the coating surface. The thickness can be read directly.
Ordering guide
