Smoke Detector

The FireGuard detects emerging fires already at their early stages (cold smoke). The sensor uses the available natural air stream in the tunnel. Any influence caused by fog will be eliminated by optional heating elements. The sensor is very compact and has neither movable parts nor wear parts nor does it need consumables. As a light source, an economical LED is used. An adjustable bracket allows mounting at the wall, in the arched section or at the ceiling. Special models for installation in the intermediate ceiling or directly in the ventilation dampers are available. Various ways of connections allow a flexible system integration. Individual setting of parameters allows an optimal object and location related setting of alarms, there are no false alarms. Maintenance is limited to occasional cleaning and the automatic adjustment with a control rod. Soiling monitoring provides information on the state of the instrument. Maintenance is only necessary when required, from experience only about every 5 years, and the time required per instrument is normally between 15 and 25 minutes at the most.
  • Rapid, reliable smoke detection without false alarms
  • Fog elimination by optional heating elements
  • Compact design, no movable parts


Measuring principle

120° Scattered light

Nominal range

0 .. 3 E/m


670 nm


0.001 E/m

Temperature sensor

-30 °C .. + 55° C

Reaction time

5 s @ wind speed 1.5 m/s


Wall mounting, under-ceiling mounting, intermediate ceiling mounting, mounting in ventilation damper


Stainless steel 1.4571


IP66 (only for electronic part)

Flow cell material


Ambient temperature

-30 °C .. +55 °C


0 .. 100% rel. Humidity

Supply voltage

24 VDC

Power input

4 W (without heater)
13 W (heater, optional)


ca. Ø107 x 283 mm


0.9 kg


Optional: WLAN module; IEEE 802.11 b/g/n access point with web server

Connection box SIPORT 2:

  • Power supply: 85 .. 264 VAC; 47 .. 63 Hz
  • Power input: max. 25 W
  • Protection: IP66
  • Enclosure: Polyester, fibre glass reinforced
  • Weight: 1.3 kg
  • Dimensions: approx. 220 x 120 x 95 mm

Modules for SIPORT 2:

  • Interface Module Profibus DP
  • Interface Module Modbus RTU
  • Interface Module PowerRel:
    - 2 x 0/4 .. 20 mA, max. 500 Ω, galvanic separated
    - 2x Semiconductor relays max. 30 V, max. 0.12 A, Ron max. 25 Ω