Delock 5 mm Fork Light Barrier Type K with 4 Open Cable Ends, NPN, Light/Dark Switchable, 2 m

Featuring a rapid 1 ms response time and a 1 kHz switching frequency, the Delock 91864 fork light barrier delivers precise, high-speed object detection in a compact 5 mm slot. This through-beam photoelectric sensor is engineered for reliable presence sensing in industrial automation, packaging, and assembly applications where space is limited and accuracy is critical.

Overview

The Delock 91864 is a fork light barrier (also known as a slot sensor) with a 5 mm gap. Its infrared LED emitter and matching receiver are housed in a rugged PBT body, providing a fixed optical axis that eliminates alignment issues common with separate emitter/receiver pairs. The sensor offers both Light-ON and Dark-ON output modes, selectable via a dedicated white wire, making it adaptable to diverse control logic requirements. With an NPN output capable of sinking up to 100 mA, it interfaces directly with PLCs, microcontrollers, and relays.

What stands out

• Ultra-fast response: max 1 ms, enabling detection of fast-moving objects
• Switchable Light-ON / Dark-ON via white wire for flexible integration
• Wide operating voltage range: 5–24 V DC, suitable for both 5 V logic and 24 V industrial systems
• Robust PBT housing with IP50 protection for industrial environments
• Four open cable ends (2 m) allow custom connector termination
• Built-in output status LED for quick diagnostics

Technical details

• Sensor type: Photoelectric fork sensor (through-beam)
• Sensing gap (slot width): 5 mm
• Output type: NPN (open collector)
• Operating mode: Light-ON / Dark-ON (switchable)
• Operating voltage: 5 – 24 V DC
• Max. output current: 100 mA
• Max. current consumption: 20 mA
• Response time: ≤ 1 ms
• Switching frequency: 1 kHz
• Light source: Infrared LED
• Protection class: IP50
• Housing material: PBT (Polybutylene terephthalate)
• Operating temperature: -25 °C to 55 °C
• Mounting: Screw mounting (M3 holes)
• Indicator: Output status LED
• Cable length: 2 m
• Connection: 4 x open cable ends (Brown: +V, Blue: GND, Black: Output, White: L/D select)

Our verdict

The Delock 91864 fork light barrier is a dependable, high-speed sensing solution for tight spaces. Its switchable output logic and broad voltage compatibility make it a versatile choice for system integrators and OEMs seeking a compact, easy-to-install sensor without compromising performance.