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.

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Full Description

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
Retro-reflective sensor	0.05 m to 3.7 m	PNP	None	Light Switching	VL18-3F3340

Product Documentation