FlowTrack sensor nodes are installed in buildings according to a systematic schema. They are ideally placed discreetly within close proximity to entrances, exits and stairs as well as before elevators on or below the ceiling. Neuralgic points, where paths cross or there are particular points of interests, are also suitable. Under optimal conditions, a single FlowTrack sensor covers a circular measuring area of up to 1,500 sqm. The measuring area can be affected by structural conditions.