All About Smoke Detectors on Marine Ship

   Smoke detectors are devices which sense the smoke and give the signal to the fire control panel. There are of two type, Photoelectric Detectors and Ionization Detectors.

Must Read > SOLAS Regulation of fire Detection System

Photoelectric Detectors

> The Optical Smoke Or Photoelectric Type Smoke Detector, uses a light source to detect smoke. 

> The Infra-Red LED is a lens that shoots a beam over a large area. 

> If smoke is present in the room, it enters the optical chamber, having smoke particles scatter and sensor sets of the alarm.

> In very large areas where a smoke detector is placed, there are two optical detectors that send the straight line of infra-red beam from a sender to a receiver. 

> Optical Smoke Detectors are less sensitive to false alarm fire, such as minor smoke from candles, cooking, steam etc.

Ionization Detectors

> Ionization smoke detectors detect smoke even it is too small to naked eye

> It is a best and cheap alternative for Photoelectric detector

> Through alpha radiation, the ionization smoke detector passes through the air-filled space container allowing flow of electrons.

> However if any smoke gets inside the chamber and absorbs the alpha particles, it lowers the level of ionization, hurting the flow of electrodes, thus setting off the alarm.

> More commonly placed in accommodation areas.

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