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3.3 Optical sensor
The sensor uses an invisible infrared beam
to detect vibrations of the belt. A nar-
row angle orange LED generated beam is
provided to guide the aiming of the sensor.
The very best signal from the belt is seen
when the sensor is held perpendicular to the
belt at the centre of the span at 9,5 mm (3/8
in) distance. When physical restrictions are
present, it is possible to get useable readings
with the sensor up to 50 mm (2 in) distance
from the belt and/or tipped up to 45° from
perpendicular.
It is possible to take measurements from the
edge of the belt. The toothed side of a belt is
equally acceptable as a target for the sensor.
The sensor LEDs should be kept clean by
wiping with a soft cotton cloth. Solvents are
never to be used.
3.4 Acoustic sensor
The acoustic sensor uses a CLAVIS patented
technique for detecting the belt vibration
signal whilst minimising ambient noise. The
acoustic sensor is particularly suitable for
belts which vibrate poorly or where the
amplitude of belt vibration is very small. The
'jaws' of the sensor should be positioned over
the centre of the belt and placed mid length
of the belt span. The sensor should not be
allowed to touch the belt as this will reduce
the belt vibration signal. A range of sensors
is available to suit belts of differing widths.
The standard Type 3 sensor is suitable for all
automotive applications.
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