Passive infrared technology has been the gold standard for motion sensors for over 20 years, detecting movement by sensing body heat. Qolsys has added its proprietary S-Line sensor technology, creating a secure, encrypted wireless connection to the panel. It is triggered when a person or animal enters an area within its 30-foot range. It can be set to ignore animals smaller than 40 lbs., drastically reducing the chance of a false alarm caused by a pet.



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QS1231-840 Motion Detector Guide

Get started with your new motion detector.

How to Program the QS1231-840 to the IQ Panel 2

View instructions for connecting a motion detector to your panel.

QS1231-840—Battery Replacement

View instructions for replacing your motion detector's batteries.

QS1231-840—Tamper Error

Learn how to fix a sensor tamper error.

QS1231-840—Resolving a Malfunction

View instructions for resolving a sensor malfunction.