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

In automated production lines and packaging machinery, detecting small objects as they pass through a narrow gap can be a challenge. The Delock 91870 fork light barrier solves this with a compact 5 mm slot that reliably senses objects as small as a few millimeters, even at high speeds. Its through-beam principle ensures stable detection regardless of object color or surface finish.

Who is it for

This sensor is ideal for system integrators, machine builders, and maintenance technicians who need precise, fast, and dependable presence detection in tight spaces. It suits applications such as counting small parts on conveyors, detecting labels or edges in printing, and monitoring the position of components in assembly fixtures.

Main features

• Forked photoelectric sensor with 5 mm slot width for precise object detection
• Through-beam sensing principle for reliable operation with various object types
• NPN output with switchable Light-ON / Dark-ON modes for flexible integration
• Fast response time of max. 0.5 ms for high-speed applications
• Infrared LED light source (880 nm) for stable performance
• 4 open cable ends (2 m) for easy wiring to controllers or relays
• Compact PBT housing with IP50 protection for industrial environments
• Yellow LED indicator for quick output status verification

Specifications

• Sensor type: Forked photoelectric sensor
• Sensing principle: Through-beam
• Sensing gap: 5 mm
• Output type: NPN
• Switching mode: Light-ON / Dark-ON switchable
• Light source: Infrared LED (880 nm)
• Operating voltage: 10 - 30 V DC
• Max. output current: 100 mA
• Current consumption: Max. 20 mA
• Response time: Max. 0.5 ms
• Cable length: 2 m
• Connection type: 4 open cable ends
• Housing material: PBT (Polybutylene terephthalate)
• Protection class: IP50
• Operating temperature: -25 °C to 55 °C
• Indicator: Yellow LED (output status)
• Cable material: PVC
• Cable diameter: 3.5 mm

Tips

When wiring the open cable ends, refer to the color coding: typically brown for positive supply, blue for ground, black for output, and white for mode selection. Ensure the sensor is mounted securely to avoid vibration-induced false triggers. For dusty environments, consider additional protection as the IP50 rating is not dust-tight.