Triboelectric Perimeter Security Sensor Border on the Lock Reliable Perimeter Intrusion Detection for Long-Term Applications. ► 2 lines x 250 m; ► Adaptive threshold minimizing false alarms; ► Detects climbing, damaging or digging attempts. CVD-111 is a vibration-sensitive triboelectric perimeter security sensor applied to secure metal fences and detect any intrusion attempts. A reliable solution for enhancing the security of metal fabric fences including: chain link, razor wire and welded ...