Wöhler UL 23 / US 23
Hotline: +49 2953 73-211
Fax: +49 2953 73-250
24
3.3.1. Methods of reducing background noise interference
Placing the flexible wave guide into the sensor port makes the reception of
the UL 23 more directional. This shields the sensor from competing sounds
entering from other directions. You can further shield background noise by
using something as simpple as a clipboard or piece of foam from inside the
carrying case. Your angle of approach also effects results in loud areas. If
possible, always aim the instrument away from the source of background
noise and toward the suspected leak area.
Reducing the sensitivity suppresses the effect background noise has on the
display and headset. This helps make the leak sound more identificable.
The most difficult background sounds come from areas of high turbulence
within a pipe. This can be where high velocity flow changes direction, or is
restricted such as within a partially closed valve. These situations naturally
produce high frequency sound which is very similar to the sound of the
leak. Use the standard methods for reducing background noise. If you are
still unsuccessful, shut the system down. Although the pressure may be
somewhat reduced, it should still be sufficient for leak testing.
3.4. Tipps on use
• If you are trying to find a leak in a tight area, use the flex tube in the front
of the VPE. You can use any lenght of tube (it is standard 1/4 in.) but
remember the sensitivity is slightly reduced the longer you go.
• When leak testing, use as much pressure as permissible for the system.
Increasing the pressure can double the flow through the same orifice,
therefore increasing the ultrasound created by the leak.
• If the system permits it, spray distilled water on the suspect area. Before
the water runs off, scan with the UL 23. Water on a pressurized leak can
increase the amount of sound created.
• When searching for vacuum leaks remember, the majority of the sound
created by a leak is internal. If the system seals permit, you may need to
pressurizes the system with dry nitrogen in order to increase the sound
of the leak.
4. Applications
The UL 23 is a very versatile test instrument. Ultrasonic sound is generally
produced by friction, arcing, and turbulence. Therefore any pressurized
gas, moving machine, or electrical system can be tested. With the optional
Ultrasonic Sound Generator you can also find easily leaks in non-invasive
enclosures, such as building.
Summary of Contents for UL 23
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