Checkline TI-CMXDLP - Manual (Page 4)

– 4 –
1.0 Introduction
The Check•Line model TI-CMXDLP is an ultrasonic thickness gauge that measures
with extreme versatility. It has the ability to measure simultaneously measure coatings
and material thicknesses while maintaining the ability to locate pits, laws and defects
in the material. Based on the same operating principles as SONAR, the TI-CMXDLP is
capable of measuring the thickness of various materials with accuracy as high as ± 0.001
inches, or ± 0.01 millimeters. The principle advantage of ultrasonic measurement over
traditional methods is that ultrasonic measurements can be performed with access to
only one side of the material being measured.
1.1 Disclaimer
Inherent in ultrasonic thickness measurement is the possibility that the instrument will
use the second rather than the irst echo from the back surface of the material being
measured. This may result in a thickness reading that is TWICE what it should be.
Responsibility for proper use of the instrument and recognition of this phenomenon
rest solely with the user of the instrument. Other errors may occur from measuring
coated materials where the coating is insuficiently bonded to the material surface.
Irregular and inaccurate readings may result. Again, the user is responsible for
proper use and interpretation of the measurements acquired.
– 101 –
14.0 APPENDIX A – VELOCITY TABLE
Material Sound Velocity
in/µs Sound Velocity
m/s
Aluminum 0.2510 6375
Beryllium 0.5080 12903
Brass 0.1730 4394
Bronze 0.1390 3531
Cadmium 0.1090 2769
Columbium 0.1940 4928
Cooper 0.1830 4648
Glass (plate) 0.2270 5766
Glycerine 0.0760 1930
Gold 0.1280 3251
Onconel 0.2290 5817
Iron 0.2320 5893
Cast iron 0.1800 approx. 4572
Lead 0.0850 2159
Magnesium 0.2300 5842
Mercyry 0.0570 1448
Molybdenum 0.2460 6248
Monel 0.2110 5359
Nickel 0.2220 5639
Nylon 0.1060 approx 2692
Platinum 0.1560 3962
Plexiglas 0.1060 2692
Polystyrene 0.0920 2337
PVC 0.0940 2388
Quartz glass 0.2260 5740
Rubber vulcanized 0.0910 2311
Silver 0.1420 3607
Steel (1020) 0.2320 5893
Steel (4340) 0.2330 5918
Steel Stainless* 0.2230 5664