Delock Fork Light Barrier 5 mm Type L with 4 Open Cable Ends NPN L/D Selectable 2 m

On a busy packaging line, a sensor must detect the leading edge of a cardboard flap without physical contact. The Delock 91866 fork light barrier sits astride the conveyor, its 5 mm gap allowing the flap to pass through while an infrared beam monitors presence. When the beam is broken, the NPN output switches, signaling the PLC to trigger the next station. The L/D selectable logic means the same unit can be wired for light-on or dark-on operation, adapting to reflective or matte targets. With four open cable ends, integration into custom harnesses is straightforward, and the 2 m lead reaches the control cabinet without extension.

Key specifications

• Sensor type: Fork light barrier (slot sensor), through-beam principle
• Sensing gap: 5 mm
• Output: NPN, light-on/dark-on selectable (L/D)
• Light source: Infrared LED
• Operating voltage: 10 - 30 V DC
• Max. switching current: 100 mA
• Switching frequency: 1 kHz, response time 0.5 ms
• Connection: 4 x open cable ends, 2 m cable length, 26 AWG
• Housing: ABS, IP50, M3 screw mounting (2 holes)
• Indicators: Yellow LED (output), green LED (power)
• Operating temperature: -25 °C to +55 °C

Why choose it

The Delock 91866 offers precise edge detection in a compact, easy-to-mount fork housing. Its selectable light-on/dark-on output provides flexibility for different application requirements, while the robust ABS body withstands industrial environments. The open cable ends allow custom wiring lengths and connector choices, reducing installation time and cost.

Ideal use cases

• Edge detection on conveyor belts and packaging machines
• Counting small parts passing through a slot
• Position verification in automated assembly lines
• Label detection on rolls or sheets
• Presence sensing in narrow gaps where diffuse sensors are impractical

Good to know

This sensor is designed for clean, dry environments (IP50). For dusty or wet conditions, consider a sealed alternative. The 5 mm gap limits target thickness; ensure the object fits without contact. The NPN output requires a sinking input on the controller. Mounting screws M3 are not included.