Kidde Deugra - A Hamilton Sundstrand Company

Fire alarm/fire detection:


Line/Point detectors and smoke detectors

Detectors help to detect specific areas in which they trigger an alarm signal, for example, during fire, overheating, or smoke development.

This is much more than a simple smoke detector. The control unit of the onboard protection system evaluates the alarm signal and transmits it to the vehicle information system in order to initiate the necessary counter measures.

Point-shaped linear temperature detectors and optical smoke detectors serve as detectors. They are able not only to report the start of a fire, but also that the fire has been extinguished. And, as a rule, these detectors are again ready for operation after the successful fire fighting operation.


UNITWIRE: A temperature detector produced in standard lengths of 150 cm to 600 cm.

UNITWIRE is a fire alarm wire in the form of a stainless steel capillary with coaxial electrode.

During a temperature rise, both resistance and capacity change. If a selected threshold value is exceeded, the operation of the extinguishing system is triggered.

UNITWIRE can be installed in the area to be protected in such a way that it continuously monitors the entire area of the room.

Low-cost variant: Linear temperature detector, whose coating melts the moment the trigger temperature is reached and generates a short circuit. This alarm system is intended for single use only, and must be replaced after the alarm is triggered.

Point detector


Fire alarm resetting switch
The fire alarm resetting switch operates according to a mechanical principle: During a rise in temperature, the cylindrical sleeve expands, so that the alarm is triggered at a predetermined breaking point. As soon as this temperature drops to a lower level, the alarm contact opens: The alarm stops and the switch is again ready for operation. 

Mechanischer Punktmelder.

Mechanical point detector.
Mechanical point detectors operate according to the principle of specific thermal expansion: If a set temperature is exceeded, the point detector transmits a triggering signal to the respective control unit. And after the fire fighting process, the detector simple resets.

Thermo-differential alarm


Thermo-differential alarm.
The thermo-differential alarm monitors the ambient temperature. An alarm is triggered not only if a preset temperature is exceeded, but also in the case of a rapid rise in temperature. The latter is monitored by two balanced temperature resistors.

Optical smoke detector:

Der optische Rauchmelder.

The optical smoke detector.
The optical smoke detector operates according to the light-scatter principle: Inside the detector, a measuring chamber is located in which a light diode regularly emits light rays. As soon as the smoke enters the chamber, the light from the smoke particles is reflected and detected by a photographic lens. This results in triggering the alarm.