Robinair 16455 TruTrack Ultrasonic Leak Detector - Manual (Page 9)

7
Background Noise
The TruTrack Ultrasonic Leak Detector detects a narrow band of
ultrasonic sound. There might be overwhelming background noise, but
those sounds are not normally within the detection range of the detector.
The detector’s patented circuitry reproduces the sound signature of the
signal it detects. Consequently, 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 rhymical mechanical pattern. Fans generally do not produce any wind
noise that is detected by the TruTrack, but the fan motor may produce a
“buzz” or “hum.”
NOTE: 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 detector provides a good example of how the direct
translation process helps you distinguish the difference between the two
signals. Experiment by listening to other sounds made by your refrigerant
systems. You will soon be able to identify the sound of a leak.
Tips for Reducing Background Noise Interference:
1. To make the reception of the TruTrack more directional, place the
flexible wave guide into the sensor port.
2. Cup your hand around the end of the wave guide to help reduce
background noise.
3. Reduce the instrument’s sensitivity to suppress the effect that
background noises have on the display.
4. If there is high turbulence within a pipe and you have trouble
detecting the correct sounds, shut down the system. There will
probably still be enough pressure to perform a leak test.
Types of Sounds