Product Details

OPTEX expands on its industry leading outdoor battery-powered intrusion line by adding the quad beam SL-350QFR, a 350 ft. battery-powered photoelectric detector requiring no trenching or wiring. Because of this, Integrators and Dealers can offer a significant cost saving alternative to traditional hardwired systems, while End Users will benefit from less downtime to business operations during install. The iSeries SL-350QFR includes a multi functional backbox that accepts most manufacturers wireless transmitters, and comes with four batteries per set, with the option of expanding to eight for up to 10 years of battery life. In addition, the SL-350QFR is compatible with the AX-TW200 line of beam towers for a clean, concealed, wireless mounting option.The SL-350QFR is the perfect solution for perimeter protection where labor costs or trenching is an issue.

  • Quad Beam Detection
  • 4ch selectable beam frequency
  • Long battery life (2 batteries per transmitter and receiver included)
  • Accepts most major wireless transmitter
  • Sniper viewfinder for easy alignment
  • Water protection IP65
  • 5 to 10 years battery life operation for detector

OPTEX National Defense Authorization Act Declaration


  • Perimeter
  • Garden

Key Features

  • 350ft. Outdoors, Battery-Powered Wireless 4-Channel Quad Photoelectric Detector
  • With Batteries included, works with most manufacturers wireless systems.
  • 4ch selectable beam frequency


The key success of a reliable active infrared intrusion system relies on the accuracy of the beam or beam tower alignment. If the transmitting ‘beams’ and the receiving ‘beams’ are not well aligned, there is a risk of severe environmental interference from fog and sunlight, even more so if the beams are 350 feet or 650 feet apart.

When installing beam towers around a perimeter there is the tendency to think that the towers should be at a 90 degree angle from each other. Actually, a 90 degree angle can restrict the view for the signal due to the tower extrusion lip. Our technical team recommends mounting the beam towers at a 45 degree angle on the ground, this allows the beam mounted inside the tower a clear view and gives the installer some flexibility for alignment.

If you are using a floor mount enclosure, the same principle applies: you should dig a 45 degree angled square in the ground to install the ground bracket. For a more efficient method, our tech team highly recommends using theTW SSL (Included in our beam enclosure) an adjustable mounting plate specifically designed for our Smart Line Beam series. The Smart Line beam can be fixed on to the TW SSL then the plate can be clipped in to the beam tower. Using this method, alignment can be easily facilitated by simply adjusting the plate up or down in the grooves to set it at the right height.

OPTEX also recommends using a voltmeter during the beam alignment process. Please refer to the owner's manual for the proper voltage needed for beam alignment.

The beams can operate between 10.5vDC to 30vDC. When connecting to an intruder system, 12vDC will be sufficient. If however, you’re using a heater unit (HU-3) you will need a 24vDC supply. Our wireless beams will need 2 or 4 3.6v lithium batteries.

View all FAQs

Other products you may be interested in