Infrared Flame Detector

IR flame detectors respond directly to the IR, modulated (flickering at 5 to 30 cycles per second) radiation from flames. The sensor design usually incorporates a delayed response, selectable in the range of 3 to 30 seconds, to minimize responses to non-fire sources of radiation. Thus, alarms are caused only by sustained, flickering source of IR radiation.

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Detailed Description for Infrared Flame Detector

IR flame detectors respond directly to the IR, modulated (flickering at 5 to 30 cycles per second) radiation from flames. The sensor design usually incorporates a delayed response, selectable in the range of 3 to 30 seconds, to minimize responses to nonfire sources of radiation. Thus, alarms are caused only by sustained, flickering source of IR radiation.

 

 

Features: 

 

-Wide field of view enables greater coverage for detecting fires utilising fewer detectors

 

-LED status indication provides clear visibility

 

-Continuous Optical Path Monitoring (COPM) checks detector’s electronic circuitry and optical path integrity

 

-Stainless steel construction enables high level of corrosion resistance for Marine environments

 

-EEx e wiring compartment eases field wiring connection

The IR flame detector is ineffective for beginning fires or smoldering. It is used where possible fires would develop quickly (fuels, such as combustible gases and liquids, or loose cotton fiber), and it is capable of protecting a large area if it is mounted high on a ceiling or wall (30 to 50 feet).

The sensitivity of IR detectors to a fire is affected by the distance of the device from the fire. For example, if the distance is doubled, the fire has to be four times as large to be detected. To maintain immunity to possible nonfire sources of alarms, you should usually select longer response delays (10 to 30 seconds) for low (8-foot) ceiling mounting. Shorter delays, in the range of 3 to 10 seconds, are used when detectors are mounted on higher ceilings. For high-hazard areas, the detector can be mounted on a low ceiling and a low delay setting used to obtain sensitivity and fast response. Shields to eliminate possible false alarm sources from the field of view of the detector are sometimes used, especially in a high-sensitivity application of the device.

Some detector models designed for the fast response do not have the "flicker" discrimination feature, but instead have two sensors with different spectral responses. These sensors are used to distinguish between an actual fire and other sources of IR radiation.

Glowing ember detectors are nondiscriminating and fast acting. Ambient light levels must be maintained below 20 footcandles. Location and shielding are important for this type to avoid false alarms caused by incandescent lamps and sunlight.


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