ACS UK1401, Руководство по эксплуатации, Страница: 35 / 44

Ultrasonic tester UK1401
Operation Manual
35
ACOUSTIC
CONTROL
SYSTEMS
2
Figure 37
To measure the crack depth, please perform the following:
- Press the instrument for 15 to 20 seconds onto the surface of the object being inspected parallel to the crack about 20
to 30 mm apart.
- The instrument will measure the ultrasonic sound propagation time on the monolithic section of the inspected object
“without crack”.
- Press the “ENTER” button to record it.
- Place the transmitting and receiving transducers in such a manner that the crack is between them. To decrease an error,
the crack must be possibly located at even distance to each transducer, and must be located perpendicular to lines of their
placement.
- The measured value of the crack depth will be displayed on the screen.
If depth value of another crack shall be determined on the same object,
then place the tester over another crack, etc.
Note: Do not press the “ENTER” button after the measurement of time
over the crack, since in that case the instrument will take the measured time
value as a basic one.
2.3.4 FRONT mode
The mode allows for detection of front duration (time) of the first half
wave (arrivals) of the ultrasonic signal from zero to the peak level; it allows
for the quality evaluation of the concrete structure. In particular, the mode is
used to monitor the supports of the railway contact network.
The screen in the measurement mode of the crack depth, within the set
standard (green scale) and exceeding the set standard (red scale) is shown
in the Figure 37.