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Flame Detectors/Sensors: Aperture

The document discusses flame detectors and sensors. There are two main types of flame detectors - infrared (IR) and ultraviolet (UV), sometimes in combination. Flame detectors activate based on the flickering frequency of flames, which is above 25 Hz for UV and between 4-25 Hz for IR. The front window allows flames within a particular wavelength range, making positioning and angle important. Filters are used to allow the relevant wavelength ranges to the photoelectric cell, which detects light and converts it to an electrical signal. The signal is then amplified and passed to an alarm triggering circuit. Combining IR and UV elements makes some flame detectors very sensitive. Suggested locations for flame detectors include machinery engine rooms, boilers, fuel

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Gokul Raj
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60 views2 pages

Flame Detectors/Sensors: Aperture

The document discusses flame detectors and sensors. There are two main types of flame detectors - infrared (IR) and ultraviolet (UV), sometimes in combination. Flame detectors activate based on the flickering frequency of flames, which is above 25 Hz for UV and between 4-25 Hz for IR. The front window allows flames within a particular wavelength range, making positioning and angle important. Filters are used to allow the relevant wavelength ranges to the photoelectric cell, which detects light and converts it to an electrical signal. The signal is then amplified and passed to an alarm triggering circuit. Combining IR and UV elements makes some flame detectors very sensitive. Suggested locations for flame detectors include machinery engine rooms, boilers, fuel

Uploaded by

Gokul Raj
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Hellooo FLAME DETECTORS/SENSORS

LENS PHOTO
AMP TRIGGER
FILTER ELECT FOR
CELL ALARM

TIMER
Aperture

Two types of flame detectors INFRARED (IR) AND ULTRAVIOLET (UV) &
sometimes a combination of both
Flame detectors activate on the principle of wave length, in other words,
FLICKERING FREQ. OF FLAME
> 25Hz 4 – near 25Hz
FRONT WINDOW :- Allows only flame within a particular range, hence
positioning and angle very important

FILTER : For IR it filters 4 – 25Hz flickering freq

For UV, it filters > 25Hz Freq


PHOTO ELECT CELL : Like any other Photo Elect Cell, it detects only light and
converts it to an electricl signal
AMP : Amplifies the signal and passes it on to the alarm triggering circuit.

SOME FLAME DETECTORS HAVE COMBINED IR/UV ELEMENTS, MAKING


THEM VERY SENSITIVE.

LOCATION OF FLAME DETECTORS – use for Hypermist


System

M/E, BOILERS, PURIFIER (FO), INCINERATOR, GENERATORS

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