The DSC BV-502GB Bravo 5 Ceiling-Mount PIR Motion & Glass Break Detector with Tamper is used for detecting both motion and the sound of breaking glass. Not many sensors offer this type of dual-purpose functionality, and the hardwired DSC BV-502GB with 360 degree coverage pulls it off well.
The motion sensor for the device is a passive infrared (PIR) detector that actively looks for any movement that occurs below. When the device senses a change in infrared energy caused by movement, the sensor will alert the system to the situation. The quad element PIR sensor uses multi-level signal processing (MLSP) to distinguish between motion caused by humans and motion from other sources. Temperature compensation allows the sensor to function properly when the ambient temperature close to one's body.
The glass break sensor is a micro-controller that uses digital signal processing technology. The device uses Dynamic Signal Processing to detect the breaking of plate, laminated, wired or tempered glass. Sounds with similar frequencies, such as "bells" and "ringing" sounds, will be ignored by the sensor. This feature is particularly useful for preventing false alarms from occurring. And with "white noise rejection", the sensor should not be activated by any background noise that is present.
Users should consider a few details when mounting the BV-502GB. For best results, it should be mounted on the ceiling and have a direct line of sight to the glass window or casing. The motion sensor works best when the device is not facing any reflective surfaces, heavy air flow, moisture, sunlight or large obstructions. The sensor should also not be placed directly next to any devices that frequently make noise (such as a phone or doorbell), as they could prevent the glass break sensor from working properly.
Please note that the BV-502GB is the version of the Bravo 5 that uses Form C wiring (normally open or normally closed) for both the motion sensor and the glass break sensor. The BV-502GB also includes a tamper switch. There are also versions of the same sensor that use Form A (normally closed wiring only) for the motion and Form C for the glass break. One version has a tamper switch (BV-501GB), and the other does not (BV-500GB). DSC also offers versions of these same three sensors with only the PIR motion and no glass break sensor (BV-502. BV-501 and BV-502).