The detectors are used for protection of perimeters of objects with a complex configuration, as well as a second line of defence or in the absence of an exclusion zone.
The RELEF-2 detector is a dual-flanking version of the RELEF detector and has one two-channel receiver and two transmitters. When organising the protection of long perimeters it is more economically feasible to use the RELEF-2 detector.
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