Superior Signal Company LLC
AccuTrak
®
VPX-WR
User’s Manual
© 2015
11
WAVEGUIDES
Waveguides are tubes that carry the sound from a source point, such as a leak point, to
the sensor of the VPX-WR. We have designed the VPX-
WR so that standard 1/4” tubing
can be used to make waveguides to fit the user’s needs. This is very useful in pneumatic
systems found in tight spaces like the tail or nose of aircraft or industrial control panels.
To make your own waveguide copy the one supplied. You will need a nut a ferrule set and
an O-Ring or a piece of tape. The O-Ring is to keep the nut from falling. We use Swagelok
brand components but you can use other brands that fit Swagelok. See the figure below
for the alignment.
All 1/4” tubing type fittings from Swagelok will fit into the Nose Cone. You can use tubing
up to 15’ long (5m). Longer tubing lengths attenuate the soun
d. The easiest way to make
a wave guide is to use the nose cone. Insert the nut and the two ferrule pieces on the
tubing as shown in the following figure, then pass them through the female fitting in the
nose cone and screw the nut finger tight. Use a 1
/2” wrench on the fitting and 9/16” on the
nut and turn the nut one full turn. Do not exceed the 0.23” length of the tube from the face
of the nose cone, you will damage the sensor.
The tubing material can be plastic, copper, steel etc. If you use metals ensure the nose
cone is tight on the horn before inserting to minimize thread loading and potential
stripp
ing. Plastic is available from Superior Signal in precut pieces of 6”, 18”, and in bulk
as well as the fittings, ferrules and O-rings.
