Passive Sensor PA-4820A

Passive sensor for wall and corner mounting adopting fuzzy theory.

■Adoption of Fuzzy Theory The two outputs from the newly developed dual twin element are divided into two pieces of information: the temperature difference and shape difference between the detection object and the background. Using fuzzy theory, it accurately determines whether the detection object is a human or a small animal and outputs an alarm. Even when phenomena that are likely to cause malfunctions, such as small animals (like mice), stray light, drafts, and external noise occur, the dual twin effect ensures that there is little to no impact. ■Abnormal Alarm Function While the sensor is in a standby state, the built-in program allows the sensor itself to monitor the following functions. If an anomaly is detected, it notifies of the abnormality through continuous alarm output and the continuous illumination of the alarm indicator light. ●Low Power Voltage Abnormality… The newly developed CPU constantly monitors the power supply voltage provided to the sensor. If the power supply voltage drops below a certain level, the abnormal alarm is activated. ●Equipment Abnormality… In the unlikely event that damage or disconnection occurs in the internal circuits or connections of the sensor, the abnormal alarm is activated. ●Aiming Position Abnormality… Even if the aiming device is forgotten to be returned after confirming the surveillance area, the abnormal alarm is activated.

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