What is the principle of flame detector?

For ultraviolet rays with the wavelength of 0. 185~0.260 micron generated by flame combustion, solid substances such as silicon carbide or aluminum nitrate can be used as sensitive elements, and gas tubes such as Geiger-Maitreya tubes can also be used as sensitive elements.

For infrared rays with a wavelength of 2.5~3 microns generated by flame, sensors made of aluminum sulfide can be used, and for infrared rays with a wavelength of 4.4~4.6 microns generated by flame, sensors made of lead selenide or aluminum tantalate can be used. Different sensors can be selected according to the emission spectra of different fuels, and triple infrared (IR3) is widely used.

Extended data:

Installation point:

1. The general principle is to install the detector at twice the height of the highest target in the protected area. Within the effective range of the detector, it should not be blocked by obstacles, including transparent materials such as glass and other spacers. At the same time, it can cover all the targets and areas that need protection, which is convenient for regular maintenance.

2. When the detector is installed, it is generally inclined downward by 30-45 degrees, so that it can look down and forward, and at the same time reduce the possibility of mirror pollution. All possible fires in the protected area should be incident in a straight line to avoid indirect incident and reflection.

3. In order to avoid detecting blind spots, another flame detector is generally installed in the opposite corner, which can also provide backup when one of the flame detectors fails.

When installing a flame detector, you should generally pay attention to the above points. Here, the friendly reminder needs special attention: avoid possible false alarm sources within the cone detection range of the flame detector.

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