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2.10 The Transducer
The transducer is the “business end” of the TI-007X. It transmits and receives ultrasonic
sound waves that the TI-007X uses to calculate the thickness of the material being
measured. The transducer connects to the TI-007X via a single shielded coaxial cabale
with microdot connectors.
Delay Line Transducer
The single element delay line transducer is commonly used with the TI-007X for
materials with an approximate range of 0.006” to 1.00” in steel. The measurement
modes used with this style of transducer are echo-echo (E-E) and interface-echo (IE).
Echo-echo mode will be used for the lower end of the measurement range, while
interface-echo for the upper end of the measurement range. Interface-echo mode
measures from the end of the delay line to the first return echo from the back wall of
the material, while echo-echo measurements are made between the first and second
return echoes from the back wall of the material. The frequency range for the versions
Electromatic commonly supply are from 10MHz to 20MHz.
The Delay line is fastened to the transducer with a retaining ring. A drop of couplant is
applied between the delay line and transducer body. Refer to the diagram above. The
couplant should be checked on a regular basis to keep it from drying out. To replenish,
unscrew the retaining ring counterclockwise, separate the delay line from the body,
‘clean both surfaces’, apply a drop of couplant, and reassemble.
Delay Line Graphite Tip
(for use with Plastics Mode)
The TI-007X has a special “PLAS” mode that uses the standard delay line transducer, as
described above, but with a replaceable graphite delay tip. This mode and tip should be
used when the velocity of the plastic material measured is similar to the velocity of the
standard acrylic delay tip, and not achieving any signal/measurement. The graphite tip
creates a ‘mismatch’ between the tip material and the plastic material measured.
The Delay line is fastened to the transducer with a retaining ring. A drop of couplant is
applied between the delay line and transducer body. Refer to the diagram above. The
couplant should be checked on a regular basis to keep it from drying out. To replenish,
unscrew the retaining ring counterclockwise, separate the delay line from the body,
‘clean both surfaces’, apply a drop of couplant, and reassemble.