User's Guide _______________________________________________________________________
66 ___________________________________________________________________ M211107EN-C
Day/Night Photo Switch
In certain applications it is necessary to calculate a special night visibility
value from the measured MOR. In these cases a simple day/night photo
switch is sufficient for discerning between day and night ambient light
conditions. A low voltage (12 DC) model of the photo switch has to be
used. The switch output can be connected to the photo switch input on
the FSC202 processor board. See Figure 36 below for wiring details. For
system configuration, refer to section Day/Night Sensor on page 99.
A closed contact of the Day/Night Photo Switch corresponds to darkness
that is nighttime.
NOTE
The cable shield of the photo switch cable must be properly grounded in
the cable gland of the interface unit's enclosure, see
Figure 29 on page
.
1303-067
Figure 36 Wiring Day/Night Photo Switch
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