« SecuriSens ADW 511A - the linear heat detector »
No limits to effective fire protection
The protection of people, assets and the environment becomes crucial whenever conventional fire
protection methods are no longer adequate. Corrosive gases, extreme humidity, high
temperatures and polluted air entail difficult operating conditions for reliable fire detection. The
ADW 511A system is false alarm-proof and failsafe. Intelligent electronic signal evaluation means
that fires are detected quickly and reliably. With continuous, fully automatic monitoring,
maintenance work is reduced to a minimum. The ADW 511A meets the response behaviour
according to EN 54-5, class A1-G, is VdS, UL and Atex approved. The system has been tried and
tested world-wide in:
  • Road, railway and underground tunnels
  • Railway stations, passenger areas, connecting
  • Locomotive and tramway depots
  • Underground car parks and semi-open multi-storey
    car parks
  • Warehouses for combustible gases and liquids
  • Fuel reloading stations and open loading ramps
  • Areas subject to explosion hazards
  • Mines and conveyor installations
  • Chemical/pharmaceutical plants, painting plants
Mode of operation
Linear heat detectors are based on the physical principle
that, for a given volume, the pressure of a gas changes
whenever its temperature changes. Over a distance of
approx. 100 m a copper sensor tube monitors the
ambient temperature. A fire source will heat up the
sensor tube locally and, with it, the air it contains. The
change in pressure is instantly registered by an
electronic pressure sensor connected to the extremity of
the tube.
To exclude faulty measurements due to pressure losses, a test motor generates a specific
overpressure in the sensor tube at regular intervals. If the pressure rise actually measured does
not correspond to the programmed measured value, a malfunction indication is displayed. The
system is user-friendly, immune to electrical, thermal and mechanical interference, and can be
used as a combined rate-of-rise temperature detector/fixed temperature heat detector.
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