G - Physics – 08 – B
Patent
G - Physics
08
B
358/21, 340/140.
G08B 17/12 (2006.01) G08B 17/107 (2006.01)
Patent
CA 1150359
6694 INVENTORS: J?RG MUGGLI and GUSTAV PFISTER INVENTION: ALARM DEVICE WITH A CONDITION SENSOR ELEMENT ABSTRACT OF THE DISCLOSURE In an alarm installation containing a central evaluation unit and alarm devices arranged re- motely therefrom, the transmission of energy from a radiation source and the reporting back of the signal occurs exclusively according to optical principles by means of radiation conducting elements, so-called light guides or conductors, by means of which the alarm de- vices are connected with the evaluation device. The alarm devices contain a preferably high-ohm sensor element, for instance a smoke-sensitive ionization chamber, whose operating voltage is infed by means of a solar cell which is irradiated by a light guide and whose output signal is fed back to the evaluation device by means of a high-ohm electrical transducer and a light guide. Such type alarm installation preferably is used for fire detection purposes, for gas, smoke temperature detection or intrusion protection, and is particularly suitable for use in an explosion-endangered environment or one subjected to electrical disturbances.
365255
Muggli Jurg
Pfister Gustav
Cerberus Ag
Johnson & Hicks
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