Using Photoelectric Sensors Instead of Vehicle Loops
6-12
SlideSmart Installation and Reference Manual
Revision C
The ideal reflector mounting suspends it inside a 12-inch long piece of 3-inch PVC conduit. Cut the opening
of the PVC conduit at a 45-degree angle to act as a drip shield. Hold the reflector against the backside of the
PVC conduit by attaching a 3-inch male connector. Do not cement the connector. This would prevent the
reflector from being reached for future cleaning. To create a mounting base, attach a 3-inch aluminum flange
(electric meter hub) to the connector. This whole package can be mounted to any flat surface.
Locate the reflector in the center of the invisible beam of infrared light to achieve the most sensitive alignment.
The beam center is determined by the following test: while holding the reflector in your hand, slowly raise it
until the beam is no longer returned and the photo eye trips. Mark this maximum height. Now lower your
hand and determine the lower limit of the infrared beam by watching for the trip point. Mark this position as
well. Repeat the same procedure for left and right at the center elevation of the beam, as determined by the
previous test. Once the four limits have been determined, either mount the reflector in the center of the area
outlined or realign the eye for the position of the reflector. If the photo eye is realigned, be sure to perform the
centering test again to verify that the reflector is truly in the center.
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Some site conditions (for example, dirt or gravel roads) may warrant using photoelectric sensors as vehicle
detectors. Refer to Figure 6-11.
Read the information about photo eyes found under
Installing Photoelectric Sensors For Secondary Entrapment
Protection Only
, but connect the photo eyes to the Smart Touch DC Controller loop detector inputs. See
Figure 6-10.
EYE
OPEN
EYE
CLOSE
EXIT
LOOP
BLOCK
EXIT
IN OBS
LOOP
OUT OBS
LOOP
CENTER
LOOP
EDGE
EYE
COM
+ 24 V
EMERG
OPEN
SHOW
LEDs
RADIO
EDGE +24V
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Photo Eye connections for
Free Exit detectors
Photo Eye connections for
Inside Obstruction detectors
Photo Eye connections for
Outside Obstruction detectors
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