Дорожное движение барьер автоматический бум

*Reflection-coating aluminium alloy boom *Electrophoresis steel shell with polyester surface *SMT microcomputer control technology device *Adjustable anti-extrusion protecting device *Intelligent limit device using microcomputer control technology *Machinery release control device *Optical balance spring or electric control device *Barrier boom clutch, machinery rise while power-off and automatic reset while power available *One special chip to fit both compression and tension springs *Three keys control the barrier bar up, down and stop.*Intelligent obstacle-sensitive return device *Infrared ray for anti-dropping *Compatible with built-in or built-out loop sensor *Three control ports: open, close, stop *Compatible with RS485(optional) *Traffic light communication port(220VAC) *Automatic heating-up while external temp. lower than O°C*Running time 3s(Boom length≤4.5m) 6s(Boom length≥5m)