Wöhler UL 23 / US 23
Hotline: +49 2953 73-211
Fax: +49 2953 73-250
26
4.2. Unpressurized Systems
Leaks at unpressurized systems like buildings, automobiles etc. will be
detected with the additional help of the Ultrasonic Sound Generator US 23
(see chapter 8).
The US 23 is used to fill rooms with sound that is above the human hearing
range, and cannot be heard. It can penetrate through minute cracks, even
ones that are not directly behind the leak point, and exit through it. It can
thus trace the path air, or water, will take to cause a leak.
The UL 23 receives the ultrasonic sound that escapes from the leak point,
processes it and displays its strength. The bigger the leak is, the higher the
volume in the headset.
To test an enclosure, turn the US 23 on and place it on one side of the item
to be tested. Close the door, window, etc., or seal the enclosure being test-
ed. Using the UL 23 start from a low sensitivity and check if you can hear
any sound. If you can, check the area of interest and note the points where
the intensity is high. If you cannot hear any sound, increase the sensitivity
and repeat the previous step. The points where the sound is greatest are
most likely leaks.
If the sound from the generator is too loud, and seems to be coming from
everywhere, you should place the unit in a towel, or use another method to
muffle the sound.
Pressi
ng the „Mode Select“ button will change the output of the generator
from continuous tone to „Burst Tone“. If the background noise is extremely
loud in a particular area, using Burst Tone will make the output of the US
23 much easier to hear.
4.2.1. Buildings
Weatherizing buildings requires finding the points where the weather ele-
ments can enter the building.
With the UL 23 and the US 23 the task becomes very simple. Place the US
23 in the room to be leak-tested and turn it on. Go outside with the UL 23
and start a systematic search to find the leaks. Of course you also have the
possibility to place the US 23 outside and to check inside with the UL 23.
Start around the perimeters of the doors and windows, using tape and a
marker pen to register the volume levels at the locations they are discov-
ered. After you have finished, read the numbers on your tape and try to
Summary of Contents for UL 23
Page 12: ...W hler UL 23 US 23 Hotline 49 2953 73 211 Fax 49 2953 73 250 12 Transportkoffer Best Nr 7278...
Page 17: ...W hler UL 23 US 23 e Mail mgkg woehler de http mgkg woehler de 17 DE...
Page 18: ...W hler UL 23 US 23 Hotline 49 2953 73 211 Fax 49 2953 73 250 18...
Page 34: ...W hler UL 23 US 23 Hotline 49 2953 73 211 Fax 49 2953 73 250 34...
Page 42: ...Technique sur Mesure Mode d emploi Testeur d tanch it par ultrason UL 23 US 23...
