LD 500_SHORT BAL_V2.03 EN Page 11 of 20
6.4.4 Parabolic mirror
Before the parabolic mirror can be used, its data – located on the
supplied USB stick – must be imported into the LD500, if it was reor-
dered.
Import:
Export/Import → New tool → Parabol_xxxxxxxx
The parabolic mirror bundles horizontally incident ultrasound in its
focal point where the ultrasonic transducer is located. On the one
hand, this leads to a considerable amplification of the measured ul-
trasound (high range) and, on the other hand, to a very precise direc-
tional behaviour, since ultrasound that does not incident horizontally
is reflected by the reflector.
The combination of these two characteristics enables the parabolic mirror to precisely locate leaks at
large distances.
Quantification distance (distance) → 3 – 12 m
Use of parabolic mirror:
• Large distance to pipe/components 3 – 15 m
• Interfering noise
• Leakage not freely accessible (behind a fence)
• Near leaks (superimposition)
Change of sensitivity levels
Ultrasound levels can be understood as a "loudness" of the leakage.
With the “Sensitivity" button, the sensitivity of the LD500 can be adjusted to the environment, which
strongly influences the acoustic behaviour of the device and increases or decreases the valid value
range. A reduction in sensitivity reduces the range of the leakage reading but the "responding area",
indicated by the circle in the display, also gets smaller, which considerably simplifies detection.
Sensitivity levels
0 – 60 dB = Highest sensitivity level of the device (use with small leaks and no noise), selection with
the "HiSn" button or the "Sensitivity" button
10 – 70 dB = Leakages and noises get "less noisy", the range is reduced.
20 – 80 dB = Leakages and noises get "less noisy", the range is reduced.
30 – 90 dB = Leakages and noises get "less noisy", the range is reduced.
40 – 100 dB = Most insensitive stage (large leaks, many noises → for heavy-duty application)
By default, the LD500 is set to the auto function and will automatically switch between levels
(10 – 70 dB to 40 – 100 dB).
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