SL-350QFR

The SL-350QFR provides infrared perimeter detection across distances of up to 100 metres. Its long-range coverage suits industrial facilities, logistics centres, warehouses and large commercial perimeters.

The SL-350QFR operates using lithium batteries, eliminating the need to install power cables along the perimeter. When connected to a compatible wireless transmitter, alarm signals are also communicated without dedicated signal cabling.

This significantly simplifies installation, particularly across existing properties, remote boundaries and locations where trenching would be disruptive or expensive.

Four high-power infrared beams provide stable intrusion detection across the 100m range. All four beams must be interrupted simultaneously to trigger an alarm, helping reduce unwanted activations from birds, falling leaves and small animals.

The sealed housing protects against dust and water ingress, while the UV-resistant polycarbonate cover helps maintain infrared transmission over time.

Four selectable frequency channels allow multiple SL-350QFR beam pairs to operate in close proximity. Installers select different channels to minimise interference when stacking beams or protecting several perimeter sections.

A 2× magnification viewfinder, upper/lower beam selection and receiver-side LED and sound assistance support accurate optical alignment. Horizontal adjustment of ±90° and vertical adjustment of ±10° provide flexibility when positioning transmitter and receiver units across the 100m detection distance.

The SL-350QFR combines quad beam detection with adjustable beam interruption times to help minimise unwanted alarms in outdoor environments.

All four infrared beams must be interrupted simultaneously to trigger an alarm. This helps prevent small animals, birds and falling leaves from causing unnecessary activations.

Installers can also select from four interruption times: 50, 100, 250 or 500 milliseconds. This allows the detection response to be adjusted to suit the site, helping the system ignore brief interruptions while maintaining effective intrusion detection.

For installers, this means fewer nuisance alarm callouts, less time spent adjusting the system after installation and improved confidence in alarm performance.

Outdoor perimeter detection systems are exposed to changing weather conditions throughout the year, from heavy rainfall and freezing temperatures to dust and prolonged sunlight. The SL-QNR Series is designed to withstand these challenges, providing reliable perimeter protection in demanding outdoor environments.

Its IP65-rated housing protects internal components against dust and water ingress, while the anti-frost hood design helps prevent frost from forming over the optical sections, reducing the risk of interference with infrared beam transmission. The durable, UV-resistant construction also helps protect the sensor against prolonged exposure to sunlight and environmental wear.

Together, these features help maintain consistent detection performance throughout the seasons, reducing weather-related disruption, unnecessary maintenance and the need for repeated site visits. This makes the SL-QN a dependable choice for exposed fence lines, industrial facilities, warehouses and other outdoor perimeter applications.