Wohler UL 23, Руководство пользователя

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Wöhler UL 23 / US 23
e-Mail: mgkg@woehler.de http://mgkg.woehler.de
23
EN
The UL 23 is capable of hearing leaks from over forty feet away, but it is
best to hold the instrument as close to the test area as safely possible.
Check around fittings and piping using a zigzag motion, carefully covering
all suspected areas. If there is no ultrasonic sound present, the display
should not have any lights on. When an ultrasonic signal generated from a
leak is detected, it will be indicated by an increase in the LED meter, and a
rushing sound will be hard in the headset. This sound will become more
intense, and the meter reading will increase as the instrument is drawn
closer to the leak point.
If there is noise in the area and the display is at maximum, reduce the sen-
sitivity until the lights disappear. The display reading is only for relative
measurements (comparisons). Two lights versus ten can mean two things.
Either you are far from a given leak, or the leak is smaller than the one that
produces ten lights. Use the sound intensity in the headset and the varying
lights to guide you toward the leak point. Reducing the sensitivity as you
approach the leak will verify that you are on the right path since the indica-
tions will increase in the direction of the leak.
3.3. Background Noise
The UL 23 detects a narrow band of ultrasonic sound, therefore although
there may appear to be overwhelming background noise, the sound may
not be within the detection range of the instrument. Notice that you can yell
directly into the sensor and your voice will not be translated in the headset.
The UL 23’s patented circuitry is capable of reproducing the sound signa-
ture of the signal it detects. This means that the sound you hear is closely
related to the actual sound. It is an actual translation, not an electronically
synthesized tone, or „beep“.
Leaks sound like a „hiss“ or rushing sound, while compressors „chatter“ a
rhythmical mechanical pattern. Fans should not produce wind noise to in-
terfere with leak detection, t
he fan motor may produce a „buzz“ or „hum“
which is a different sound than that of a leak.
Mechanical vibrations sound very different from leak sounds. Shake a set
of keys, then take a short quick breath through your nose. Listening to both
sounds through the UL 23 is a good example of how the direct translation
process of the UL 23 helps you to distinguish the difference between the
two signals.
Practice listening to different components of your system, this will help you
to identify the sound of a leak from other normal operational sounds.