Method of operating an ionization smoke alarm and ionization...

Details Method of operating an ionization smoke alarm and ionization... Method of operating an ionization smoke alarm and ionization...

G - Physics

01

N

358/21

G01N 27/64 (2006.01) G08B 17/11 (2006.01) G08B 29/04 (2006.01)

Patent

CA 2010105

A method of the operation of an ionization smoke alarm which has a measuring chamber open to the ambient air and ionizable by a radioactive source. A measuring chamber includes a first electrode to which a supply d. c. voltage is applied and a measuring electrode the potential of which changes in response to the smoke density if smoke enters the measuring chamber. This potential is measured for producing a smoke alarm signal if it reaches a predetermined value. The potential of the measuring electrode is measured for at least one further electric field strength that is compared with at least a second potential which occurs at the second field strength according to the law of the agglomeration of small ions if smoke aerosols are present in the measuring chamber.

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