Ultrasonic sensors control the lowering of barriers, In car parking lots and parking garages, entry is controlled using barrier systems. The barrier must not be lowered when there is a vehicle underneath. … They detect objects regardless of vehicle type or color and monitor the entire area below the barrier.
There are various technologies for an automatic boom barrier. One of them is electro-mechanical, which is widely used due to its reliability. The other technologies are often manufacturer specific. This electro-mechanical device comes with a 24VDC drive unit that can run continuously without generating heat, so electromechanical boom barriers can be operated continuously and in an intensive duty cycle.