FDR26 Optical Smoke Detector is designed to detect smoke and signal a fire alarm.
- If the detector senses smoke, a relay is activated. Since FDR26 does not react to temperature changes, it is suitable for installation in data centers and telco rooms.
- Optical smoke detection reacts to smoke that enters the detection chamber. Presence of smoke is indicated by turning on a LED and switching a relay. Smoke is detected only if it directly "hits" the sensor. The alarm ends when the detection chamber is free of smoke particles.

| Power: | 10.5...14V DC |
| Start-up time: | 60 s |
| Alarm indication: | Red LED, switching a relay |
| Relay contact: | up to 1A / 30V DC (0.5A / 125V AC) |
| Detection: | Contains an optical detection chamber |
| Protected area: | Max. 40 m2 (430 sq. ft), max. height 7 m (22 ft) |
| Distances: | Max. distance between detectors 8 m (25 ft), max distance from a wall 4 m (13 ft) |
| Operating temperatures: | 0°C to 70°C (32°F to 158°F) |
| Max. air velocity: | 600 m/min |
| Measuring period: | 3 to 5 seconds |
| Test: | Alarm can be activated by holding a magnet near the TEST point |
| Standard: | Conforms to EN54-7 |
| Operating environment: | Indoor |
| Cover: | IP 42 (EN 60 529) |
