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Smoke/fire sensors

spaceage security systems

While is good to protect your house, office, factory from thieves, it is equally important to protect your valuables from fire.

There are different kinds of fires and hence different types of fire detection sensors. These sensors come in standalone version as well as in a Networked version. If the standalone version the detector has a built in alarm and power back up too. In the networked version all the smoke detectors communicate to a central panel (wired or wireless) which in turn gives out the required alarm.

Mostly whenever there is a fire, there shall be smoke. Unfortunately, depending upon the type of material getting burnt the volume of smoke emitted can vary greatly. Some Smoke detectors make use of this principle to detect fire. They usually have a infrared light beam falling on a receiver (within the smoke detector). When there is smoke around the detector, the path of light gets interrupted and this makes the sensor to send the required signal to central command. Such sensors are most often used though they have a problem in case the material that catches fire does not produce adequate amount of smoke.

Also, whenever there is a fire, there is rise of temperature. This rise in temperature is again unpredictable since if the place is ventilated, by the time the temperature rises to alarming levels it may be too late. This principle is also used by some Fire detectors. Earlier such sensors would be triggered at a specified temperature but this was not found practical, specially where there was a great variation in temperature due to the nature of work or simply the weather. The recent systems now use the rate of rise of temperature instead of a pre-fixed absolute temperature. Such systems see that if the temperature rise is more than a certain degrees within a small time interval then they give out the required signal. These sensors are usually used in conjunction with the smoke detectors, if at all.

The Fires are also associated with emission of various gases like Carbon dioxide, carbon mono-oxide etc. So it also possible to detect fire based on these products but then the amount of such products also varies greatly with the type of ventilation and material getting burnt. Ionization type of fire detectors use such principle. These are also seldom used alone.

The selection of right kind of sensor would determine if you shall be able to get the alarm before the fire spreads too far. For normal applications, Smoke detectors are good enough, though it is advisable to plan your fire systems in consultation with experts.

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