54 Chadwick-Helmuth Company, Inc.
Chapter 4 - Installation
4.4.2.4 Photocell Placement
When mounting the photocell system, the user must take care in
positioning the photocell probe. The two lenses of the photocell probe
work best when
• They are tangent to the arc created by the retro-reflective target (see
the illustration on page 56).
• The retro-reflective target is aligned tangent to the arc created by the
radius where it is attached.
Photocell Procedures -
Locate a specific placement for the photocell
probe, as follows:
1. Rotate the component to be balanced to a position where a blade or
some easily identifiable part of the rotating assembly crosses the
photocell beam.
2. Place a retro-reflective target on the rotating component where it can
be illuminated by the photocell beam. Make sure to align the target
strip tangentially relative to the component’s circular motion.
NOTE: The user can locate correct placement of the target by
checking the small LED, pulsating on the back of the photocell
probe. This LED is the alignment indicator. As the LED pulses
faster (at a higher rate), it indicates better alignment. However, if
the pulse rate is too fast to observe, the user must reduce the size of
the target.
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