Manual

UMX-2 Underwater Material & Coating Thickness Gauge
38
Disadvantages:
Single element transducers are not capable of detecting pits and flaws with a digital
thickness gauge, and are typically not used for corrosion inspections on blind
surfaces. Since only one crystal is used to both send and receive sound waves,
small defects that reflect very little sound energy back to the transducer are ignored,
based on the noise created by the same crystal sending the sound wave. Therefore,
these transducers should only be used when general material thickness is required,
and ‘never’ used for corrosion inspections. If there’s any interest in locating blind
surface pitting or internal material flaws, a ‘dual element’ transducer should always
be used.