The microwave linear sensors FMW-50 are intended for the protection of different sites and for detecting an intruder crossing the detection zone. The sensors are intended for the protection of direct perimeter sectors. The sites include industrial facilities, airports, sites of force structure, power plants, private premises, etc. Available and effective sensor for the protection of different sites with maximum number of positive testimonials. Operation on 10,525 GHz allows to increase the width of the detection zone. Like this we make it difficult for the intruder to cross it. The easiest configuration using control units on-board of the Rx does not require high qualification of staff. Multimeter and screw driver are enough for configuration. The sensor is successfully used on outdoor perimeter sectors free from buildings and big vegetation. The sensor assures reliable protection of the site under control.