SecuriStar SCD 573

  • Temperature-supported scattered light principle 
  • Digital signal processing 
  • Individual addressing 
  • High level of security thanks to SecuriLine® ring circuit wiring

The SCD 573 (Smoke Criteria Detector) provides early detection of smouldering, glowing and open fires with smoke development. Light transmitters and receivers are arranged at right angles in the sampling chamber to prevent the light beam of the transmitter from striking the receiver directly. First, the smoke-scattered light (Tyndall effect) reaches the receiver and then is converted into an electrical signal. If it reaches the alarm value, an alarm is sent automatically to the control unit. An advance warning stage constantly monitors the detector for contamination and communicates its condition to the control unit. This self-monitoring feature guarantees that the detector functions optimally. Detector sensitivity adapts to the prevailing ambient temperatures in the area and automatically regulates smoke sensitivity (Cubus Adaptation).

Technical data  
24 VDC Operating voltage
16 bis/to 30 VDC Permitted voltage range
460 µA Operating current, quiescent (max.)
20 mA Operating current, alarm (max.)
EN 54-7 and 17 Standards
LED red Individual display
6,8 V/5 mA External display

–25°C to +60°C



Ambient conditions

Operating temperature range

Short-term relative humidity

Constant relative humidity

IP 44 Protection class
White Colour
ABS/PC Housing material
125g Weight
G 208196 VdS approval
0786-CPD-20606 CPD approval


Product summary  
SCD 573 Scattered-light smoke detector
USB 501-1 Universal SecuriStar® base



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