WARNING
Wear eye protection that meets the
requirements of ANSI Z87.1 and
OSHA.
The Robinair 16451 Ultrasonic Sound Generator and
the Robinair 16455 “TruTrak” Ultrasonic Detector
form a non-invasive leak detection system capable of
nding leaks in enclosures, such as buildings, vessels,
automobiles, walk/reach-in freezers, or any other
container that needs to be leak-free.
The 16451 Sound Generator is used to “pressurize”
rooms and enclosures with its sound. This sound 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 16455 Detector receives the ultrasonic sound that
escapes from the leak point, processes it, and displays
its strength. The bigger the leak, the higher the volume
in the headset.
OPERATION
To test an enclosure:
1. Turn the 16451 sound generator ON. The low
battery light will ash three times and then stay
green, indicating a good battery. Place the sound
generator on one side of the item to be tested.
2. Close the door, window, etc., or seal the enclosure
being tested.
3. Using the 16455 detector, start with low sensitivity,
and listen for a sound.
a. If you can hear a sound, check the area of
interest, and note the points where the intensity
is high.
b. If you cannot hear any sound, increase the
sensitivity and repeat the previous step. The
points where the sound is the 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 mufe the
sound.
BURST MODE
Pressing the MODE SELECT button changes the
output to 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 sound generator easier to identify.
16451 Ultrasonic soUnd Generator
BATTERY REPLACEMENT
The low battery light ashes red when it begins to fail.
To replace the battery in the sound generator, turn the
unit over, with its sensor output front toward you. The
battery door is on the far side. To open, press down in
the center of the back panel, and slide it away from
you. It does not need much force to open. Replace with
one 9-volt battery.
APPLICATION SUGGESTIONS
Weatherizing buildings
Weatherizing buildings requires nding the points
where the weather elements can enter the building. This
task becomes very simple with the ultrasonic system.
1. Place the sound generator in a room to be leak-
tested and turn the generator ON.
2. Go outside with the detector and start a systematic
search to nd the leaks. Start around the perimeters
of the doors and windows.
3. Use a tape and a marker pen to register the volume
levels at the locations they are discovered.
Note: Using tape saves having to repeat the checks.
4. After you have nished, read the numbers on your
tape and try to determine the cause of the problem.
This procedure can also be used to nd leaks in sealing
logs in log homes or to check roong jobs.
Automotive
Windshields and trunk seals can be tested by placing
the sound generator on the inside of an automobile and
testing on the outside. Verify area to be tested is dry, as
the capillary tension in water may block the passage of
sound.
Refrigeration
Freezer boxes and refrigerated truck bodies can be
tested for tightness like any other enclosure. Depending
on the size, it may be necessary to move the sound
generator every ten feet inside the trailer to maximize
its effectiveness.
CARE AND MAINTENANCE
The instrument may be wiped clean with a damp towel.
Do not allow water to enter the unit, especially the front
where the sensor is located. After cleaning, dry the unit
with a paper towel. An automotive vinyl cleaner (on a
piece of cloth) will restore the luster. If you plan to store
the instrument for an extended period of time (1 year),
remove the battery.
(12 pages)
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