Checkline TI-25M - Manual (Page 11)

– 11 – – 14 –
Extremely rough surfaces such as the “pebble-like” finish of some cast
irons, will prove most difficult to measure. These kinds of surfaces act on
the sound beam like frosted glass acts on light; the beam becomes diffused
and scattered in all directions.
Rough surfaces also contribute to excessive wear of the probe, especially in
applications where the probe is “scrubbed” along the measurement surface
for use in the Scan mode. The probe should be inspected regularly for signs
of uneven wear on the probe surface (wearface). If this is detected, the
probe should be returned to the factory for repair or replacement.
6.1 Acoustic Velocity Table
Aluminum 0.2500 6350
Bismuth 0.8600 2184
Brass 0.1730 4394
Cadmium 0.1090 2769
Cast Iron
0.18000 4572
Constantan 0.2060 5232
Copper 0.1840 4674
Epoxy resin
0.1000 2540
German silver 0.1870 4750
Glass, crown 0.2230 5664
Glass, flint 0.1680 4267
Gold 0.1280 3251
Ice 0.1570 3988
Iron 0.2320 5898
Lead 0.8500 2159
Magnesium 0.2280 5791
Nickel 0.2220 5639
Nylon 0.1020 2591
Paraffin 0.0870 2210
Platinum 0.1560 3962
Plexiglass 0.1060 2692
Polystyrene 0.0920
2337
Porcelain 0.2300 5842
PVC
0.0940 2388
Quartz glass 0.2220 5639
Rubber, vulcanized 0.0910 2311
Silver 0.1420 3607
Steel, common 0.2330 5920
Steel, stainless 0.2230 5664
Stellite 0.2750 6985
Tin 0.1310 3327
Titanium 0.2400 6096
Tungsten 0.2100 5334
Zinc 0.1660
4216
Material Velocity Velocity
Type Inches/µs Meters/s
Notes: 1. These values are to be used only when a suitable sample of known thick-
ness is not available for calibrating, as slight variations in material
composition, finishing (hardening, polishing, etc.) or shape can affect the
accoustic velocity.
...
Notes: 2. “✔ ”denotes the factory default setting for acoustic velocity.
✔