Flame detector ppt
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There are two main types of flame detectors: infrared (IR) flame detectors and ultraviolet (UV) flame detectors. IR flame detectors use photoelectric cells that are sensitive to infrared radiation emitted by flames to detect fires. They work best for open storage areas and can detect fires within 90 meters. UV flame detectors detect the ultraviolet radiation emitted by flames and can be made insensitive to sunlight to prevent false alarms.
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Flame detector ppt
- 2. Types of flame detector 1. Infrared flame detector (IR) 2. Ultra violet flame detector ( UV)
- 3. Infrared flame detector (IR) 1. The bulk of radiant energy from most flames is in the infrared energy. 2. Operating device in an infrared detector is a photo-electric cell which is an sensitive to infrared radiation. 3. Other sources of infrared radiation such as hot steam pipes , hot plate etc . 4. The alarm is only given when this flicker is present and is maintained for a minimum period of time i.e. 15 sec 5. For quick detection in an early stages of fire the radius of detection should be limited to about 90 m. 6. It is useful for protection of open storage area.
- 5. Ultra-violet flame detector (UV) 1. It detects ultra-violet radiation emitted from flames . 2. Possible natural sources of UV radiation are lightening and sunlight. 3. False alarm may be prevented by including delay circuit or by suitable screening. 4. This detector can be made insensitive to sunlight.