LD 500_SHORT BAL_V2.03 EN Page 14 of 20
Superimposition of leaks: If leaks are close to
one another, the emitted ultrasound overlaps.
In this case, it is recommended to seal the leak-
ages using a cloth. This enormously increases
the accuracy of the measurement, especially
for the quantification of the leakage. At the
same time, measurements should be taken in
close proximity to the components.
Reducing sensitivity and, in particular, using a parabolic mirror (for large distances) and a gooseneck
(for smaller distances) can also make detection a lot easier.
Very large leakages: Very large leakages generate a strong ultrasonic field, which can possibly generate
an ultrasonic signal in the entire room. Here again, it is recommended to reduce the sensitivity and
check close to the individual components. The aim is to detect leakages by using the volume level of
the loudest point.
If the leak cannot be accessed, using a parabolic mirror is recommended, as it has very good direction-
ality.
Lamps and motors:
Interfering noise: Electrical buzzing → do not mix up with leakage!
Some systems and machines can also generate ultrasound that is in a similar frequency range, for ex-
ample fluorescent tubes or motors. These generally "sound" different than the typical "hissing" of leak-
ages and should not be mistaken for them.
If ultrasound can be heard and it clearly does not emanate from the compressed air system, the sen-
sitivity of the device should be reduced in order to suppress the ultrasound. If this does not suffice, the
noise must be ignored.
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