Conditions And Preparation Of Surfaces - sauter TU 80-0.01US Instruction Manual

The upper figure is a bottom view of a typical transducer. The two semicircles are
visibly separated in the middle of the surface. One of the semicircles is conducting the
echoed sound back into the transducer. When the transducer is placed against the
material being measured, this is the area directly beneath the centre of the measured
surface.
The below figure is a top view of a typical transducer.
It is pressed against the top with the thumb or the index finger to hold the transducer
in place. Only moderate pressure is sufficient to keep it stationary. Its surface must be
placed flat against the surface of the material.
Table 3-1 Transducer selection
Model Freq Diameter
MHz mm
ATU- 2 22
US01
ATU- 5 10
US09
ATU- 5 10
US10
/90°
ATU- 7 6
US02
ATB- 5 14
US02

4.2 Conditions and preparation of surfaces

At any kind of ultrasonic measurement, the shape and roughness of the surface being
tested are of paramount importance. Rough and uneven surfaces may limit the pene-
tration of the ultrasound through the material resulted by an unstable and therefore
unreliable measurement.
10
Measurement range
3.0mm～300.0mm(in steel）
40mm(grey
Cast iron HT200)
1.2mm～230.0mm (in steel) Φ20mm×
1.2mm～230.0mm(in steel） Φ20mm×
0.75mm～80.0mm
(in steel）
3～200mm
(in steel)
Lower limit Description
20 For thick, highly at-
tenuating
or highly scattering
materials
normal
3.0mm measurement
normal
3.0mm measurement
Φ15mm×
For thin pipe
2.0mm wall or small
bent pipe wall
30 For high tempera-
ture (lower
than 300°C)
measurement
TU_US-BA-e-1714