Double Beam Active Infrared Security Sensor Border on the Lock Reliable Perimeter Intrusion Detection for Long-Term Applications. ► Universal PIDS detector; ► Inbuilt heater for cold climate; ► Wide application field. CVD-123 off-the-shelf double beam detector is suitable for any perimeter intrusion detection system. CVD-123 outputs an alarm when the infrared pulse beam emitted from its transmitter is not received by the receiver for a certain period of time. Transmitter ...