SELF-CALIBRATION DETECTION DEVICE WITH SENSORS AND DEVICE FOR CONTROLLING THESE SENSORS

摘要

P INVENTION CONCERNING A SIGNALING OR ALARM SYSTEM. / P P SELF-CALIBRATION DETECTION DEVICE COMPRISING SENSOR ELEMENT 32, 16 AND CALIBRATION DEVICE 30, 36, 24, 26 , 28 TO MAINTAIN A SUBSTANTIALLY CONSTANT RESPONSE OF THE SENSOR ELEMENT TO A PREDETERMINED INPUT RADIATION SIGNAL, DESPITE THE VARIATIONS IN THE BACKGROUND RADIATION LEVEL ALSO DETECTED. / P P APPLICATION TO FIRE DETECTORS OR EXPLOSIONS. / P