The main electronic unit of this model may be placed with an easy access for maintenance. For example, the main electronic unit may be situated at a distance in the operating staff room, or on the wall directly opposite the controlled point, or right in the controlled location up above 1.5 m. In all these cases the external optical sensor will be in the very spot indicated on the plan. For instance, in vast spacious areas the external optical sensor may be adjusted in a juncture of supporting walls with window openings at about 10 metres height. Mind that the sensor should be above the window level.
Ceiling and floor voids are easy to control with the external optical sensor – a strong advantage that may help to meet the requirements. When it is the interior that matters the very possibility to conceal and minimalize flame detectors becomes extremely relevant.
Moscow and St. Petersburg restaurants, the Tretyakov Gallery found it to be the best design choice.