Fire detectors have been replaced in the Zvezda module of the Russian segment of the ISS. As reported by the special correspondent of TASS news agency, Oleg Kononenko, commander of the Roscosmos cosmonaut detachment, the procedure is routine and there is no need to worry.
These infrared detectors, which are installed behind the interior panels and outside, detect the presence of visible smoke in the atmosphere. When a certain level of smoke is reached in the atmosphere, the detector sends a signal to the onboard computer system, where an alarm is generated.
It [the detector] has high sensitivity and gives a signal at a level of smoke that is not yet visible to the eye. Extraneous factors, such as dust, can lead to accidental triggering, but these are inevitable factors. Over a long period of operation on the ISS, optical sensors have shown high reliability and stable operation
Earlier this year, astronauts in Zvezda already discovered and isolated an air leak. It was located in the intermediate chamber of the service module.
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