Polon-Alfa PPW-40REx detector detects electromagnetic radiation within the infrared range. Three detectors detect the mentioned radiation. Signals are amplified, processed, and interpreted by the microcontroller system. The microcontroller controls the operation of the detector, checks the correctness of its basic circuits and, if irregularities are detected, transmit the information to the control panel. The detector has a built-in heater that keeps the detectors optics elements transparency at the appropriate level.