Infrared Barrier No name AN900-20 — single-beam AN900-20 (MPN AN900-20)

Infrared Barrier No name AN900-20 is a single-beam infrared detection device designed for basic perimeter and opening protection. The unit emits and receives one infrared beam to detect interruptions caused by passage or intrusion. Intended for straightforward installations, the sensor is suitable for doors, gates, narrow corridors and small perimeter zones where single-beam detection provides the required level of monitoring and alarm activation.

Advantages

The single-beam design offers a compact, low-complexity solution with simple alignment and minimal maintenance. Its straightforward functionality makes it easy to integrate with common alarm panels and access control systems. Because the device focuses on one detection axis, it requires fewer mounting points and wiring runs compared with multi-beam systems, which can reduce installation time and cost while providing reliable presence or intrusion detection for defined openings.

Suitable for

• Doorway and gate monitoring
• Narrow corridors and passageways
• Small perimeter openings and fence gaps
• Basic intrusion detection integrated with alarm panels
• Access-control trip detection for turnstiles or doors

Key specifications

• Detection type: single infrared beam
• Application: perimeter and opening protection
• Typical mounting: wall or post alignment on opposite sides of opening
• Installation: wired connection for alarm input and power
• Environmental use: designed for outdoor or indoor mounting (installation-dependent weather sealing recommended)

How to use

Mount the emitter and receiver units directly opposite each other across the protected opening, ensuring a clear line of sight between them. Align the units so the beam is centered on the receiver; tighten mounting hardware to maintain alignment. Connect the device to the local alarm or access control input following the system wiring diagram and supply the appropriate power. After powering, verify beam alignment and perform a walk-test through the beam to confirm the alarm output and detector response. Periodic checks of alignment and lens cleanliness help maintain reliable detection.

Usage recommendations

For consistent performance, protect the beam path from heavy rain, fog or debris when possible, and mount units at a height that minimizes accidental triggering by small animals. Use appropriate weatherproof enclosures or seals if the installation site is exposed. When integrating with alarm or access-control panels, configure input parameters to match the panel’s expected contact type and supervise wiring where required.