Elcometer Ultrasonic Thickness Gauges can be calibrated by the user for the appropriate material in two ways:
- Set the calibration to the thickness of the known standard of the same material
- Set the frequency calibration to the appropriate value using the velocity chart below:
The Elcometer 204 is pre-calibrated for Steel only.
Material
|
km/sec
|
in/msec
|
Material
|
km/sec
|
in/msec
|
Air
|
0.33 |
0.013 |
Neoprene
|
1.60 |
0.063 |
Aluminium (2024-T4)
|
6.38 |
0.251 |
Nickel
|
5.64 |
0.222 |
Beryllium
|
12.88 |
0.507 |
Nylon
|
2.69 |
0.106 |
Boron Carbide
|
10.92 |
0.430 |
Platinum
|
3.69 |
0.156 |
Brass
|
4.39 |
0.173 |
Plexiglass
|
2.69 |
0.106 |
Cadmium
|
2.77 |
0.109 |
Polystyrene
|
2.34 |
0.092 |
Copper
|
4.65 |
0.183 |
Polyurethane
|
1.78 |
0.070 |
Glass (Plate)
|
5.77 |
0.227 |
PVC
|
2.39 |
0.094 |
Glycerine
|
1.93 |
0.076 |
Quartz
|
5.74 |
0.226 |
Gold
|
3.25 |
0.128 |
Silver
|
3.61 |
0.142 |
Inconel
|
5.82 |
0.229 |
Steel (4340)
|
5.84 |
0.230 |
Iron
|
5.89 |
0.232 |
Steel (303 Stainless)
|
5.66 |
0.223 |
Iron, Cast
|
4.55 |
0.179 |
Teflon
|
1.52 |
0.060 |
Lead
|
2.16 |
0.085 |
Tin
|
3.33 |
0.131 |
Magnesium
|
5.84 |
0.230 |
Titanium
|
6.10 |
0.240 |
Mercury
|
1.45 |
0.057 |
Tungsten
|
5.18 |
0.204 |
Molybdenum
|
6.25 |
0.246 |
Uranium
|
3.38 |
0.133 |
Monel
|
5.36 |
0.211 |
Water
|
1.47 |
0.058 |
Motor Oil (SAE 30)
|
1.75 |
0.069 |
Zinc
|
4.32 |
0.170 |
