Optex qxi wired 250x150

Product Details

The QX Infinity (QXI) series is a range of outdoor PIRs and dual-technology sensors providing 120° wide and 12m (40ft) detection area, which can be adjusted with the masking strips provided. Sleek and compact, the QXI sensors are small and well suited to any residential or commercial building as they provide reliable, animal tolerant intrusion and motion detection to trigger alarm panel of CCTV camera. QXI-DT is the hard-wired model with anti-blocking and dual-technology.

Dual-technology and Tough microwave module

The QXI series' integrated PIR and Microwave algorithm provides the ultimate stability in detection performance as the alarm is only triggered when both PIR and Microwave layers of detection detect motion. It features the Tough microwave module too, specifically developed to prevent corrosion from condensation and humidity.

Selectable mounting height

The QXI outdoor intrusion sensors can be installed at a high mount between 2.2 and 2.7m creating a multi-level volumetric detection pattern, allowing it to ignore small animals. In environments with larger animals, the sensor can be mounted between 0.8 and 1.2m height, to provide a pet alley.

Detection analysis to filter out false alarms

The QXI outdoor intruder sensors are designed to be not affected by environment or small animals. The alarm will not be triggered by changes of weather, vegetation sways or pets in the detection area, contributing to reliable outdoor detection. Additionally the series features double conductive shielding which filters out visible light and RFI disturbance.

QXI-DT is also equipped with Anti-blocking

The QXI-DT model offers an anti-blocking function in high mount utilising the microwave module to detect attempts to mask the sensor, particularly when the alarm is disarmed.


  • Approach
  • House
  • Garden
  • Driveway

Key Features

  • 12m, 120 degree outdoor PIR with anti-blocking
  • Dual-technology for greater stability, double layered detection and pet tolerant
  • High (2.2-2.7m) mount or low mount (0.8m-1.2m) for pet alley mode
  • SMDA logic and double conductive shielding to minimise nuisance alarms


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 2.2m – 2.7m. 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 0.8m – 1.2m. 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 50-60 degrees Celsius, whereas the human body maintains it at 30 degrees Celsius. This 20-degree difference is more than enough to detect intruder’s presence.


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