The TLD-110 is a single channel inductive loop detectors. The principle is based on a change in the inductance within the loop which is caused by the metallic components of passing vehicles. The changes are picked up and evaluated by a microprocessor. Ease of use due to the automatic calibration when the operating voltage is applied. 3. Technical Data  Supply voltage AC: 220V, 110V, 24V, 12V  Supply voltage DC: 24V, 12V  Sensitivity: adjustable in 3 increments (high .medium. low)  Operating temperature: -20°C to +65°C  Storage temperature: -40°C to +85°C  Frequency range: 20 kHz to 170 kHz  Reaction time: 100ms  Loop inductance: Ideal:80μH to 300μH (incl. conn. wiring) : max:50μH to500μH  Loop connection: <5m optimal  Loop connection wiring: Maximum length 200 meters, Twisted at least 20 times per meter  Dimensions: 35x74x85 mm (WxHxL)  Net Weight: 300g