SICK Retro-reflective Photoelectric Sensor

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Retro-reflective Photoelectric Sensor

A retro-reflective sensor is a photoelectric sensor that uses the interruption of a reflected light beam to detect objects. They provide reliable, consistent object detection with no incorrect switching, regardless of the shape, surface, or position of the objects. The sensors do not need to be realigned if the object shape or position changes.

Retro-reflective sensors can be used to replace complicated, cost-intensive installations using several sensors in series.

See model selection chart below.

  • Photoelectric retro-reflective sensors
  • Type of light: Visible red light 
  • Understanding detection principles:
    • Dual Lens - A lens body consisting of two lenses, a sender and a receiver, which are produced virtually in one piece.  In the dual lens system, the sent and received beams are physically separate and are positioned at a shallow angle to one another. The beams only overlap in a certain segment of the sensing range. At close range, there is a blind zone in which objects cannot be detected. So, when using sensors with dual lens optics, it is important to always maintain at least the minimum range.
    • Autocollimation - Autocollimation uses only one optical lens. The beam of light emitted by the sensor and the light beam reflected by the reflector lie on a single optical axis. The emitted light passes through a semi-transparent mirror before exiting the optical unit. After being reflected, the light beam is diverted to the receiver with the aid of the same mirror. Unlike dual lens sensors, autocollication sensors have no blind zone in front of the sensor.
  • Understanding switching modes:
    • Ligh switching - Sensor switches its output ON when the light beam is returned to the receiver.  If normally open operation is required, a light switching diffuse sensor can be used.
    • Dark switching - Sensor switches its output ON when the light beam is blocked from returning the beam to the receiver.  If normally open operation is required, a dark switching retro reflective or through beam sensor could be used.
    • Light/dark switching does both light and dark switching modes
Functional Principle Sensing Range Switching Output Adjustment Switching Mode Click for Price and Availability
Dual lens 0 to 5 m NPN None Dark Switching ZLD18-4EZ4A8
0.01 to 0.7 m PNP Potentiometer, 270° Light/dark switching  WL150-P420
0.03 to 6.5 m NPN None Light/dark switching  HL18-N4A3BA
0.03 to 6.5 m PNP None Light/dark switching  HL18-P4A3AAS06 
0.03 to 7.2 m | Cylindrical PNP None Light Switching GRL18S-P2336
0.035 to 4 m PNP Single teach-in button (Sensing range)
Manual, via Touch-Teach-in
Light/dark switching  VL18-4P2240V
≤ 5 m PNP Potentiometer, 270° Light/dark switching  GL6-P0211S77
0.08 to 12 m PNP Potentiometer, 270° Light/dark switching  WL100L-F2131
0.1 to 10 m  PNP Potentiometer, right
Sensitivity
Potentiometer, left
Light/dark switching
Light/dark switching  HL18L-P4A5BH
0.15 to 8 m PNP None Light/dark switching  WL11-2P2430

0.15 to 12 m

0.15 to 10 m 

PNP Potentiometer, 270° Light/dark switching  GL10-P4211

0.01 m to 15 m

0.01 m to 12 m

PNP Potentiometer Light/dark switching  WL280-2P2431

0.3 to 9.5 m

0.3 to 8 m

PNP None Light switching GL10-F4551

0 to 22 m 

Relay, electrically isolated Potentiometer Light/dark switching WL24-2R240
Autocollimation 0 to 3 m  PNP Single teach-in button, Cable  Dark switching WL9-3F2234S20
0 to 4 m  PNP Single teach-in button Light/dark switching  WL12G-3V2572
0 to 4 m PNP/NPN Potentiometer, 11 turns Light/dark switching  WL12G-3B2531
0 to 4 m PNP Potentiometer, 11 turns Light/dark switching  WL12G-3O2431S51
0 to 5 m | Stainless Steel PNP Single teach-in button Light/dark switching  WLG4S-3P2432V
0 to 5 m | Stainless Steel NPN Single teach-in button Light/dark switching  WLG4S-3N2432V
0 to 12 m PNP Single teach-in button Light/dark switching  WL9L-3P2432
0 to 18 m PNP/NPN Potentiometer Light/dark switching  WL12L-2B530
Retro-reflective sensor 0.01 m to 4.5 m PNP None Light Switching WLG4-3F2132
0.05 m to 3.7 m PNP None Light Switching  VL18-3F3340

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