R55 Color Mark Sensor
page 2
The R55 offers maintenance-free solid-state
reliability, with the sensing performance
until now offered only by short-lived
incandescent color mark sensors. The R55
reliably detects all color contrasts found in
common product registration color mark
applications – even such extremely low
contrasts as 20 percent yellow printed on
white. In addition, a green LED light source
and hybrid optics eliminate the need to
switch between different color light sources
for different color contrasts.
50 microsecond sensing response produces
excellent registration repeatability, even in
ultra-high-speed applications. This fast
response, coupled with the small 0.05" x
0.15" sensing image, allows color marks to
be made small and inconspicuous.
The R55 has built-in pulse-stretching output timing logic to permit reliable interfacing
to slower inputs, such as those associated with some programmable logic controllers
(PLCs). A 4-position DIP switch is accessed beneath the tethered switch cap (see
figure 2). Switch #1 selects light operate (outputs energize when the lighter of the two
colors is sensed) or dark operate (outputs energize when the darker of the two colors
is sensed). Switch #2 selects a 50 millisecond non-retriggerable one-shot pulse.
Switch #3 selects a 50 millisecond off delay. When switches #2 and #3 are both
turned to OFF, the output is a 100 millisecond retriggerable one-shot.
The R55 offers a 10-element moving LED light bar which displays signal strength,
relative to the switch point setting. The display is invaluable during setup (see
“Sensitivity Adjustment” on page 5). Switch #4 is used to disable the light bar display
during normal operation, if desired.
The sensor has two bipolar outputs: one sinking (NPN) and one sourcing (PNP). Both
switching outputs will switch loads up to 150 mA. A third dedicated 0 to 10 mA
analog output may be used for applications such as measuring or monitoring surface
brightness or texture. See Specifications and Hookup (pages 6-7) for more
information.
The construction of the R55 is extremely robust with a die-cast metal housing, plastic
optics, and IP67 and NEMA 6 leakproof design for harsh sensing environments.
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