5
Tru Pointe® Ultra
Instruction 0028-9000
Airborne Leak Detection
The Tru Pointe
®
Ultra HD is capable of detecting airborne leaks from up to 40 feet away. 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 heard 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.
The Tru Pointe
®
Ultra HD detects the ultrasound a gas makes as it leaks. Similar to the familiar
hiss a leak makes, a gas leak generates ultrasonic sound that humans cannot hear. This ultra-
sonic sound propagates like a microwave (in straight lines) and this property makes it possible to
fi
nd its source. It is a listening device not a Sniffer. Because of this, the Tru Pointe
®
Ultra HD can
function in areas where strong winds or a concentration of fumes are present.
A leak is any unwanted
fl
ow of a substance out of a system, or with vacuum, into a system. The
sound made by leaks (refrigerant, compressed air, tire leak etc.) is mostly ultrasonic and cannot
be heard by humans.
The following describes how to effectively determine the location of an airborne leak using the Tru
Pointe
®
Ultra HD.
1.
Press the On/Off Button. If there is signi
fi
cant background noise and the LED
Bargraph Display reads ‘10’, reduce the sensitivity until the LED’s disappear.
2.
While pressing the On/Off Button, scan the area of the suspected leak in a side-
to-side motion.
3.
While scanning, listen to differences in the sounds detected.
Mechanical Noise:
Usually synchronized to machine
motion in the system and easy to identify
Leak Noise:
A harsh hissing sound or bird song.
NOTE:
To become familiar with the different sounds
detected by the Tru Pointe
®
Ultra HD, listen to the sound
of an air hose at low pressure or an aerosol cleaning
spray, then shake a set of keys. This demonstration
allows the user to distinguish between mechanical noise
and leak noise.
4.
If there is leak noise in the area and the display is at ‘10’, slowly reduce the sensi-
tivity until the display reads ‘0’.
NOTE:
The LED Bargraph Display is only for relative
measurements. If a scan of the system reveals an area
with a reading of ‘2’ and an area with a reading of ‘10’,
that can mean you are far from a leak, or there are two
leaks of differing sizes in the same area.
5.
Approach the suspected leak. If the LED Bargraph Display reading increases,
reduce the sensitivity.
6.
When the general location of the suspected leak is determined, adjust the sen-
sitivity to so that 4-5 lights are illuminated when the leak area is scanned. This
technique allows the user to accurately determine when the instrument is pointed
at an area of increased ultrasound. If the LED Bargraph display increases, then
the leak source is getting closer. If the display decreases, then the leak source is
getting further away.
Содержание Tru Pointe Ultra HD
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