Smoke detector of the ionization type

Details Smoke detector of the ionization type Smoke detector of the ionization type

1982-05-17

1984-06-19

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250381, G08B 1710

Patent

active

044555539

ABSTRACT:
An ionization type smoke detector (10) includes a chamber having a measuring electrode (12), the voltage on the measuring electrode being a function of the concentration of smoke in the chamber, and further includes a comparison device (A3) for comparing the voltage measured on electrode (12) at two different times, and an output device (K) for producing an output signal if the voltages differ by a predetermined value.

REFERENCES:
patent: 3745552 (1973-07-01), Wilt
patent: 4151522 (1979-04-01), Yamauchi
patent: 4266220 (1981-05-01), Malinowski

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