Polarized retroreflective mode sensors have both the transmitter and receiver in the same housing and use a corner-cube reflector to establish a light path. The target is detected when it blocks the beam from the sensor to the reflector.
A polarized filter in the lens of the sensor allows only light at a certain phase angle into the receiver. This enables the sensor to see a shiny object as a target and not incorrectly as a reflector. A corner-cube reflector causes a phase shift in the light waves that would not occur from light reflected from a shiny, reflective target. A polarized retro-reflective sensor must be used with a corner-cube reflector. These reflectors have the ability to accurately return the light energy, on a parallel axis, back to the sensor.
Pepperl+Fuchs offers a wide range of sensors that are tailored to the gate, door and elevator industry. This includes sensors that can detect direction and differentiate between people and vehicles, sensors that monitor elevator doors and sliding or swinging doors, and sensors that provide absolute position and protection against pinch points and collisions. No matter the application, Pepperl+Fuchs has a sensor to suit your needs.
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| Model Number | Features |
|---|---|
| RLK31-54/25/31/115 | Sensor with 9m range, 2m cabled, AC/DC supply, SPDT relay |
| RLK31-54/25/31/115 SET | Sensor, OMH-RL31-01 bracket, and REF-C110-2 reflector |
| Model Number | Features |
|---|---|
| OMH-RL31-01 | Wide mounting bracket for all RLK31 sensors |
| OMH-RL31-02 | Narrow mounting bracket for all RLK31 sensors |
| OMH-RL31-03 | Shroud bracket for all RLK31 sensors; extra protection by enclosing sensor on three sides |
| REF-C110-2 | 3 inch round reflector with center mounting hole |
| Reflector Weather Cap | Reflector weather cap/hood for REF-C110-2 reflector |
Large, industrial garage doors utilize a retroreflective photoelectric sensor to reliably detect when vehicles are in the gate path. The RLK31 is used because its one-piece design consists of an emitter and a receiver in the same housing. This one-piece design simplifies installation because a power source is required only on one side of the garage door. Since a reflector is mounted on the other side, a separate power source is not required.
The RLK31 has a waterproof IP67 rating, perfect for installations that require it to be externally mounted. Gate housings often have built-in shrouds specifically for an external mounted sensor. A variety of mounting accessories are also available, including a shroud bracket which protects the RLK31 on three sides from accidental damage.
A parking garage using a roll up gate system, rather than an actual gate arm. The application is still the same, requiring a photoelectric sensor to safely detect vehicles and people in the path before lowering the gate. The RLK31 is discretely tucked away behind the gate and creates an invisible path across the door opening to the reflector on the other side.
Because of its small size, the RLK31 easily integrates into the automated gate system housing. Since there is nothing to adjust, installation only requires aligning the RLK31 to the reflector. The wide voltage range is compatible with a variety of gate systems and the built-in 3A relay can also control the gate motor.
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