Chapter 4 - Installation
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The glass bead density (which determines the percent of
retro- reflectiveness) of garden variety retro-reflective tapes
(such as that found on highway cones or survival jackets) is
less than 50 percent of our target in most cases. In most
cases these tapes are inadequate as retro-reflective targets for
the photocell.
The correct size of the retro-reflective target depends on the
distance between the photocell and the reflective target, as well
as the speed of the retro-reflective target as it passes through the
photocell beam.
The orientation of the photocell can also vary, depending on the
size of the target. A single strip of the Honeywell retro-reflective
target, aligned so it dwells in the photocell beam for the longest
period of time, is usually adequate. For details, see the the
information in Section 4.4.2.4 Photocell Placement.
4.4.2.2
General Photocell Use
The photocell triggers, that is it sends the timing pulse to the
balancer, as the target leaves the photocell beam. This being the
case, if the user wants to do really accurate alignment of the
target in the beam between adjustments, simply pull the target
through the photocell beam until the alignment light on the back
side of the photocell just goes out, then stop.
Using an erasable marker, make two marks next to each other,
one on the spinner and one on the cowl. It doesn't matter where.
One can then always align these marks and know the photocell
beam is aligned with the target on every adjustment. Over the
long haul, this accuracy will save quite a bit of time, and
eliminate errors in target placement.
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