Inspector 400 Applications
Leak Detection
2 - 6
Inspector 400 Ultrasonic Probe
User Manual
barrier of the hand between the test area and
the background noise. Move the hand and
instrument together over the various test zones.
•
Barrier: When covering a large area, it is
sometimes helpful to use some reflective
material, such as a welder’s curtain or a drop
cloth, to act as a barrier. Place the material so
that it acts as a “wall” between the test area and
the competing sounds. Sometimes the barrier is
draped from ceiling to floor, at other times it is
hung over railings.
Low Level Leaks
In ultrasonic inspection of leakage, the amplitude of
the sound often depends upon the amount of
turbulence generated at the leak site. The greater the
turbulence, the louder the signal; the less the
turbulence, the lower the intensity of the signal.
When a leak rate is so low that it produces little if any
turbulence that is detectable, it is considered “below
threshold.” If a leak appears to be of this nature:
•
Build up the pressure (if possible) to create
greater turbulence.
•
Utilize Liquid Leak Amplifier.
This patented method incorporates a CMAC 8600-5
product called Liquid Leak Amplifier (LLA). LLA is a
uniquely formulated liquid sub stance with special
chemical properties. Used as an ultra-sonic bubble
test, a small amount of LLA is poured over a
suspected leak site. It produces a thin film through
which the escaping gas passes. When it comes in
