Digital single channel loop detector for access control system

Digital single channel loop detector for access control system Technical parameters Dimension: 78*40*108mm Operating temp: -20℃ ~ +65℃ Operating voltage: 230V AC , 115V AC, 24V DC/AC, 12V DC/AC Shell material: PC+ABS engineering plastic Loop inductance: Ideal 100µH~300µH Max 50µH~1000µH Frequency range: 20kHz ~ 170kHz Loop conn. Wiring: Max length is 20meters, twisted at least 20 times per meter, total resistance