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FIDA Systems

Products Detail

Detection Devices


There are several types of detector, each of which responds to a different product of combustion (smoke, heat etc). The differences between various types of smoke are caused by the variation in size of the particles that make up the smoke. As a general rule the hotter the fire the greater the number of very small (invisible) smoke particles. Conversely a fire with low temperature decomposition produces proportionally larger (visible) smoke particles. Manual call points are used to provide a means for people in the building to raise the alarm.

Detection Devices

Optical Smoke Detector

These detectors respond quickly to large smoke particles but are less sensitive to small particles that do not constitute visible smoke.


Ionisation Smoke Detector

These detectors respond very quickly to smoke composed of very small particles (even those invisible to the naked eye). However they are less sensitive to the dense smoke composed of larger particles.


Carbon Monoxide Detector

These detectors detect the build up of carbon monoxide generated by fires. As carbon monoxide is a gas, it diffuses to form uniform concentration within the space in which it is generated. Therefore they are less affected by obstructions and heat barriers than smoke detectors. In addition a carbon monoxide detector in a corridor may detect fire in an adjacent room before a smoke detector in the corridor, as carbon monoxide will diffuse evenly throughout the corridor, whereas smoke will tend to cool to an extend that there is insufficient buoyancy for it to remain at the level at which smoke detectors are installed. Carbon monoxide detectors are less likely to produce false alarms. 

Carbon Monoxide

Heat Detector

Heat detectors are normally used where the speed of operation of smoke detectors is not required or where, for environmental or other such reasons, smoke detectors cannot be used in the system. There are two types available. These are the rate of rise detector and the fixed temperature detector.

The rate of rise detectors react to abnormally high rates of change in temperature and provide the fastest response. The fixed temperature detectors react at a predetermined temperature.

Heat Detectors

Multi-sensor Detector

Multi-sensors detectors detect both smoke & heat where the output is combined to give the final analogue value. This device is useful over a wide range of applications and highly immune to false alarm sources.


Beam Detector

These consist of two units, a transmitter and a receiver, which are displaced some distance apart (10 to 100 metres). This type of detector is specifically designed for interior use in large open type areas where the installation of point type detectors would be difficult.

Beam Detector

Duct Probe Detector

The duct probe unit is a detector which has been designed for use in situations where the standard smoke and heat detectors cannot be used. Primarily it is used for detecting the presence of smoke in extract ventilation ducting systems.

Duct Probe

Flame Detector

Infra red flame detectors detect electromagnetic radiation, which travels from a flame at the speed of light. They respond to the short wavelengths of very high temperatures such as that present in flames. The flickering shortwave infrared radiation must be maintained for a period of time before an alarm is given. These detectors are designed to respond rapidly to fires that involve clean burning fuels such as alcohol or methane, that is fires that would not be detected by the use of smoke detectors.

Flame Detector