Bacharach Tru Pointe 2100, Руководство по эксплуатации и обслуживанию, Страница: 13 / 24

9
Tru Pointe® 2100 Instruction 0028-9003
Airborne Applications
The Airborne sensor is used to detect sound waves which travel to the Tru Pointe
®
2100 through
the air. The most common airborne application is compressed air or refrigerant leak detection.
Leaks
When searching for leaks with the Tru Pointe ® 2100, remember that you are listening for the
turbulent fl ow of the gas as it fl ows from the leak ori fi ce (refer to “Principles of Operation” on page
15 for a more detailed explanation). The Tru Pointe ® 2100 is capable of hearing leaks from over
fi fty feet away, but it is best to hold the instrument as close to the test area as safely possible.
1. Stand several feet from the suspected leak area and reduce the sensitivity of the
Tru Pointe® 2100 until only 1 or 2 LED’s are lit.
2. Scan around fi ttings, fl anges and all other suspected leak sources.
NOTE: If the LED Bar Graph Display is at maximum,
reduce the sensitivity and continue scanning.
3. The sound in the headset and the LED Bar Graph Display will increase as the unit
gets closer to a leak.
In the case of large refrigerant leaks remove the nose cone and the waveguide and increase the
sensitivity. Then sweep the instrument over the entire area.
Reducing Background Noise Interference
The Tru Pointe
®
2100 detects a narrow band of ultrasonic sound, therefore although there may
appear to be an overwhelming background noise, the sound may not be within the detection
range of the Tru Pointe
®
2100.
Leaks sound like a “hiss” or rushing sound, while compressors “chatter” a rhythmical mechanical
pattern. Fans should not produce any wind noise detectable by the Tru Pointe
®
2100, although
the fan motor may produce a “buzz” or “hum”.
EXAMPLE: Mechanical vibrations sound very different
from leak sounds. Shake a set of keys, and then take a
short quick breath through the nose. Listening to both
sounds through the Tru Pointe
® 2100 is a good example
of how its direct translation process helps to distinguish
the difference between the two signals.
Practice listening to different components of the test area, this will help to identify problems from
other normal operational sounds.
The following methods can help reduce the amount of background noise detected by the Tru
Pointe
® 2100:
1. Placing the fl exible waveguide onto the airborne sensor will make the reception of
the Tru Pointe
®
2100 more directional. This helps shield the sensor from compet-
ing sounds entering from other directions. Cupping a hand around the end of the
wave guide will also help to reduce the background noise.