Optex SL-350QFRI Quad Photobeam Detector

Product Description

The OPTEX SL-350QFRI is a quad-beam photoelectric detector designed for perimeter security and intrusion detection applications. It ships as a single unit and includes an integrated transmitter, making it a self-contained beam system ready for field installation. The quad-beam configuration uses four stacked infrared beams to reduce false alarms caused by small animals, debris, or environmental interference. With a 350-foot range in outdoor conditions and a 700-foot range in indoor environments, this detector is suited for long-span coverage where single or dual-beam units fall short. Licensed security and low-voltage technicians are the primary installers of this type of equipment.

The SL-350QFRI is applicable to commercial and industrial perimeter protection where extended detection ranges are required. It is suited for outdoor fence lines, building perimeters, warehouses, large interior spaces, and similar installations where a reliable, long-range photobeam barrier is needed. The included transmitter pairs with a compatible receiver to form a complete detection zone. This unit is sold individually and is intended for professional security system integration.

Key Features

• Quad-beam infrared detection reduces nuisance alarms from small objects and animals
• 350-foot outdoor detection range for perimeter fence and open-area applications
• 700-foot indoor detection range for warehouse and large interior coverage
• Transmitter included — no separate transmitter purchase required
• Sold as a single unit (each) for flexible deployment

Compatibility

Designed as an OEM-style photobeam detector for professional perimeter security systems requiring long-range quad-beam coverage. Confirm receiver compatibility with your specific system before installation.

Installation Notes

Installation should be performed by a licensed low-voltage or security systems technician in accordance with applicable local codes and manufacturer guidelines. Power down the security panel and any connected zones before making wiring connections. Align the transmitter and receiver carefully along a clear line of sight, as obstructions or misalignment will cause detection gaps or nuisance faults. Outdoor mounting hardware should be rated for the installation environment to ensure long-term performance.