G - Physics – 08 – B
Patent
G - Physics
08
B
358/21
G08B 17/10 (2006.01) G08B 17/11 (2006.01)
Patent
CA 1064625
ABSTRACT OF THE DISCLOSURE The present invention provides a fire sensing arrange- ment comprising at least two ionization chambers and an electrical evaluation circuit arranged to yield an alarm signal when the resistance of one at least of the ionization chambers exceeds a predetermined threshold level as a result of the entrance of smoke into the chamber, one of said ionization chambers being a smoke-sensitive and air-accessible ionization chamber of a first kind including means for ionizing the air which are so constructed and arranged that ions of both polarities are formed in the whole of the space between the electrodes of the chamber, and being provided with means for retarding the entry of air flowing into the chamber, and another of said ionization chambers of a second kind being arranged for substantially unhindered entrance of air and including ionization means so constructed and arranged that a part only of the space between the electrodes so that the ion current flowing in the chamber comprises ions of only one polarity, the evaluation circuit being so arranged that an alarm signal is initiated upon a predetermined increase in the resistance of either or both of the two chambers.
270474
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