Product Details

The QX Infinity (QXI) Series is a family of high or low mount outdoor PIR and dual-tech sensors providing a 120° wide and 40ft detection area. The new Quad-Element technology provides highly reliable detection performance within a compact and sleek design, fit for any residential or commercial applications. It also features OPTEX’s sensing analytics, called the Super Multi-Dimensional Analysis (SMDA), to reduce any noise created by the environment.

Hardwired PIR & Microwave dual-tech model

  • 120° wide and 40ft detection area, with OPTEX's new Quad-Element technology providing highly reliable detection performance within a compact and sleek design.
  • Fit for any residential or commercial applications.
  • Selectable mounting height & pattern
  • Multiple level & pet alley pattern
  • anti-masking function (QXI-RDT)
  • Double conductive shielding (QXI-DT/RDT)

OPTEX National Defense Authorization Act Declaration


  • Approach
  • House
  • Garden
  • Driveway

Key Features

  • 40' 120° Outdoor Quad-Element Technology Hardwired Dual Tech Microwave & PIR
  • Hardwired PIR & Microwave dual-tech model
  • High (7'-9') or low mounting (2.6'-4') options available
  • Double conductive shielding


Anti-blocking is a feature for the QXI-DT in multi-level mode only. Anti-blocking is used when the detector suspects that it is being blocked by a person or object and will trigger the trouble output. The logic steps are as follows:

  1. PIR detects first
  2. Microwave then receives strong signal within 10-30 seconds of the first PIR detection
  3. No PIR detection within 10-30 seconds
  4. Trouble signal is generated

Masking strips are supplied with the QXI in the box. You can mask individual sections of the detection area by placing the corresponding strip to the lens. The latches that hold the lens in place can be found at the top, bottom, left and right of the lens. The lens can be removed easily by unlocking each latch with your thumb or screwdriver and gently push the lens out. Please ensure that you place the masking strips on the inside of the lens, not on the outside.

The QXI is in multi-level mode by default which accommodates mounting heights between 7 ft. – 9 ft. Low mount is for the pet alley function which can be achieved by removing the main unit from the backbox and gently flipping the mirror into the horizontal position. Be aware to not touch the mirror face, only the sides. The mounting height for the pet alley pattern is 2.6 ft – 3.9 ft. If the QXI is mounted higher than this and is in the pet alley pattern, that human detection may be compromised. Please note, anti-blocking feature is not available when the QXI is in pet alley mode.

No, PIR sensors detect the temperature difference between the detection goal and the bottom inside the detector’s field of view both when the difference is positive or negative. During the day the flat temperature can reach 122-140 degrees Fahrenheit, whereas the human body maintains it at 98.7 degrees Fahrenheit. This 20-degree difference is more than enough to detect intruder’s presence.

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