41
en
Material being
measured
Mode
Transducer type
required
Notes
High penetration
plastics and
castings
PULSE-ECHO
(P-E)
Cast iron - 1MHz to 5MHz
transducer.
Cast aluminium - 10MHz
transducer.
Plastics typically require
lower frequency
transducers depending on
the thickness and make-
up of the material.
Larger diameters offer greater
penetration power because of the
crystal size, for difficult to measure
materials.
Corrosion and pit
detection in steel
and cast materials
PULSE-ECHO
(P-E)
Typically a 5MHz
transducer or higher is
required.
Use lower frequencies for greater
penetration and use higher
frequencies for better resolution.
Material thickness
measured through
a coating
ECHO-ECHO
(E-E)
Special high damped
transducers are required;
typically the 3.5MHz,
5MHz, and 7.5MHz hi
damped transducers.
These transducers are suitable for
use in both pulse-echo and echo-
echo modes. This enables you to
measure overall material thickness
using the Echo-echo mode, and then
switch to pit detection mode (Pulse-
echo) without changing transducers.
CG60_CG60DL_TMA_0498_00_01_23225_A6L.fm Page 41 Tuesday, November 22, 2011 12:19 PM
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