Cygnus DIVE Operating Manual
M3-DIVE-M-ENG_Iss9.docx
Page 108 of 117
Material
Velocity of Sound (V)
Conversion
Factor (f)
m/s
in/us
Stainless Steel 316
5750
0.2264
0.971
F51 Duplex Steel
UNS S31803
5715 - 5750
0.225
–
0.2264
0.956
–
0.971
Core Ten Steel
EN12223 S355-J0
5920
0.2331
1.00
Tin
3320
0.1307
0.561
Titanium
6100 - 6230
0.2402
–
0.2453
1.030
–
1.052
Tungsten Carbide
6660
0.2622
1.125
Epoxy Resin
2500
0.0986
0.422
Acrylic
2730
0.1076
0.461
Nylon (Polyamide)
2620
0.1032
0.443
Reading Conversions
If only a few measurements are to be taken on a material other than
Steel, it may be easier to leave the calibration set for Steel and merely
convert the readings by multiplying by the
Conversion Factor
for the
material being measured. This method avoids unnecessary
recalibration.
Example.
The gauge is calibrated for Steel [5920 m/s], but the reading is
being taken on Copper [4700 m/s] :
T = t x V
COPPER
/ V
STEEL
= t x 4700 / 5920
= t x 0.794
thus :
T = t x f
[ where: f = V
COPPER
/ V
STEEL
]
where :
T = true thickness of Copper being measured
t = actual reading obtained
f = Conversion Factor (from table)
V
COPPER
= Sound Velocity in Copper : 4700 m/s
V
STEEL
= Sound Velocity in Steel : 5920 m/s
The
Conversion Factor f
: is given for various materials in the
Table of Sound Velocities
