Fire protection thru-beam sensor LA28/LK28-FC-Z/31/116, Compact fire protection photoelectric sensor, Thru-Beam Sensors, Compact fire protection photoelectric sensor for safety devices on fire barriers, Approval in accordance with VdS Test Report FSA and externally monitored manufacture (?? Symbol), Not sensitive to ambient light, even with switched energy saving lamps, Installation in Zone 2/Class I, Div. 2, For FOUNDATION Fieldbus H1, Fixed, high-availability terminator, No spacing required between modules