Patent · US Expired

Ionization smoke detector with increased operational reliability

US4364031A · kind A · utility

3Cited by
8References
6Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 20, 1980
Grant dateDec 14, 1982
Priority date—
Expiry dateOct 20, 2000

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG08B17/11
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

An ionization smoke detector containing at least one ionization chamber operated at an extra low voltage or potential. The ionization chamber contains a sensor employing a measuring electrode and a counter electrode. Ambient air has practically free access to the ionization chamber and there are provided one or more radioactive sources for generating ions, a supply voltage source and an electrical circuit for triggering an alarm. The smoke detector possesses increased operational reliability since circuit elements are provided which enable signal reporting to a central station by means of a low-voltage of about 200 volts, however the sensor is operated at an extra low voltage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.