DMTA-10043-01EN, Rev. C, July 2016
Application Notes
67
•
Remember that both material sound velocity and transducer zero offset will
change with temperature.
For maximum accuracy at high temperatures, velocity calibration should be
performed using a section of the test bar of known thickness heated to the
temperature where measurements are to be performed. The 27MG Ultrasonic
Thickness Gage has a semiautomatic zero function that can be employed to adjust
zero setting at high temperatures.
•
Using the Fast mode with the Freeze function may help in obtaining
measurements as quickly as possible.
•
Note that a corrosion gage is not designed for flaw or crack detection, and cannot
be relied upon to detect material discontinuities. A proper evaluation of material
discontinuities requires an ultrasonic flaw detector such as the EPOCH used by a
properly trained operator. In general, unexplained readings by a corrosion gage
merit further testing with a flaw detector.
•
For further information on the use of dual element transducers in corrosion
gaging, or for information on any aspect of ultrasonic testing, contact Olympus.
•
Often, performance on hot, corroded materials will be considerably improved by
the use of the Gain Adjust procedure or the Material Sensitivity Optimization
procedure. High temperature couplants are generally less efficient than those
used at lower temperatures, so the 27MG will work better when sensitivity is
adjusted or optimized to accommodate high temperature conditions.
Summary of Contents for 27MG
Page 6: ...DMTA 10043 01EN Rev C July 2016 Table of Contents vi...
Page 8: ...DMTA 10043 01EN Rev C July 2016 List of Abbreviations viii...
Page 22: ...DMTA 10043 01EN Rev C July 2016 Important Information Please Read Before Use 14...
Page 30: ...DMTA 10043 01EN Rev C July 2016 Chapter 1 22...
Page 38: ...DMTA 10043 01EN Rev C July 2016 Chapter 3 30...
Page 42: ...DMTA 10043 01EN Rev C July 2016 Chapter 4 34...
Page 50: ...DMTA 10043 01EN Rev C July 2016 Chapter 6 42...
Page 64: ...DMTA 10043 01EN Rev C July 2016 Chapter 7 56...
Page 76: ...DMTA 10043 01EN Rev C July 2016 Chapter 10 68...
Page 84: ...DMTA 10043 01EN Rev C July 2016 Chapter 11 76...
Page 88: ...DMTA 10043 01EN Rev C July 2016 Appendix 80...
Page 90: ...DMTA 10043 01EN Rev C July 2016 List of Figures 82...
Page 92: ...DMTA 10043 01EN Rev C July 2016 List of Tables 84...
