OD850 outdoor TriTech PIR/microwave detector

July 2004 Perimeter Security, Alarms & Intruder Detection, Cyber Security

The OD850 is a 15 m by 15 m PIR/microwave intrusion detector that is intended for use outdoors and in other harsh environments. By using Motion Analyzer II PIR signal processing and linear travel distance (LTD) microwave processing, the detector can measure the linear travel distance of a target to provide excellent catch performance of people while ignoring stationary objects with slight movement such as tree limbs and hanging signs. The combination of advanced processing techniques and mechanical design combine to provide a detector that offers superior performance in a wide range of weather conditions.

The wall mount outdoor OD850 TriTech PIR/microwave detector is a detector intended for use outdoors and in other harsh environments. It uses Motion Analyzer II PIR signal processing and linear travel distance (LTD) microwave processing to provide excellent catch performance of people while ignoring slightly moving objects such as tree limbs. Advanced processing techniques and mechanical design combine to provide a detector that offers superior performance in a wide range of weather conditions.

Motion Analyzer II PIR signal processing uses multiple thresholds and timing windows to analyse timing, amplitude, duration, and polarity of signals to make an alarm decision. It will not alarm on extreme levels of thermal and illumination disturbances caused by hot and cold draughts, sunlight, or lightning.

Linear travel distance microwave signal processing measures the linear travel distance of a target to make an alarm decision. It eliminates alarms for objects that move but do not travel, such as tree limbs and hanging signs.

The detector features two user-selectable PIR sensitivity settings - standard sensitivity: recommended setting for maximum false alarm immunity. Tolerates environment extremes on this setting; and intermediate sensitivity: recommended setting for any location where an intruder is expected to cover only a small portion of the protected area. Tolerates normal environments on this setting. This setting will improve your intruder catch performance.

In addition to an alarm relay, there is a Form 'C' unsupervised, timed relay contact that transfers one second after an alarm and follows a user-selectable timer. A DIP switch allows the user to specify whether or not the unit will alarm only during the night. Setting the switch to ON suppresses the alarm and timed relays during daylight. If the LEDs are enabled, then LED indications will still continue.

The high-efficiency LED indicators (one red and one green) use the same technology as traffic lights to make them visible in sunlight. A DIP switch setting allows the user to disable these LEDs during normal operation to save power.



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