Passive Sensor PA-4820A

Passive sensor for wall and corner installation adopting fuzzy theory.

■Adoption of Fuzzy Theory The two outputs from the newly developed dual twin element are separated by the CPU 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 if phenomena that are likely to cause malfunctions, such as small animals (like mice), stray light, drafts, or external noise occur, the dual twin effect ensures that there is almost 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 continuous illumination of the alarm indicator light. ●Low Power Voltage Abnormality… The newly developed CPU constantly monitors the power voltage supplied to the sensor. If the power voltage drops below a certain level, an abnormal alarm is triggered. ●Device Abnormality… In the unlikely event that damage or disconnection occurs in the circuit or connection parts inside the sensor, an abnormal alarm will also be triggered. ●Aiming Position Abnormality… After confirming the surveillance area, if the aiming device is forgotten to be returned, an abnormal alarm will be triggered.

Security Sensor Systems