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Based on the photoelectric effect. The photons emitted by the flame go through the window in spectrosil (silicon oxide) of the detector and come to strike the cathode of the monotube. This cathode is photo-selective, i.e.that it is covered with a metal which, if it is struck by a radiation lower or equal to 245 Nm, emits electrons.

The electron thus emitted by a photon and animated of a certain energy, will ionize a molecule of inert gas contained in the tube. The electrons thus emitted go,in their turn, each one to be responsible for another ionization and so on. It is the phenomenon of avalanche which characterizes this tube, conferring a very great sensitivity and a negligible response time to him.
The temporary current (impulsion)in this way created between cathode and the anode is located at a frequency proportional to the flow of photons, intensity of UV.

By a maitrized design of technology ultraviolet ray and infra-red, the detectors offlame FL3100 are the reference as regards detection of flame. Based on a technology by microprocessor, these detectors are designed to detect the flames to deliver immediately and precisely an alarm while preserving their immunity against false alarm of which the lightning, the arc cutting; hot objects and other sources of parasitic radiations.
Ces mêmes alarmes sont disponibles par des sorties relais configurables directementdans le détecteur. Par ailleurs le port de communications série permet de raccorder 128 instruments (247 avec répétiteur) à un automate ou tout autre système utilisant le protocole Modbus. Les registres de communication fournissent les états d'alarmes, défauts, et autres informations de fonctionnement : le dépannage ou le paramétrage de l'instrument.

Flame detection IR+IR: