What is a Radar and Laser Level Switch?

Radar and laser level switches are basically non-contact switches that emit ultraviolet radar rays and microwaves to transmit and reflect waves. The waves strike the surface of the media and reflect back to the transmitter. It then measures the distance or height of the medium by measuring the time taken to transmit and receive and the speed of the wave. Velocity will be constant, but time will vary. This causes the electrical output to change.