G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 17/11 (2006.01)
Patent
CA 2096548
An ionization type smoke detector comprises a smoke detecting section including an intermediate electrode and an outer electrode to confine an outer ionization chamber therebetween into which smoke to be detected is introduced, and reference resistance section for forming a reference resistance with respect to the outer ionization chamber, sensor output section including a first transistor with its gate connected to the intermediate electrode, and a serial circuit connected to a source of the first transistor and consisting of a first fixed resistor and a first constant- current circuit having a first variable resistor for output adjustment, the sensor output section producing a sensor output from a junction between the first constant current circuit and the first fixed resistor, fire discriminating section including a reference voltage generating circuit having a second variable resistor for reference voltage adjustment, and producing a discrimination output when the sensor output exceeds a reference voltage, and fire signal transmitting section for transmitting a fire signal in response to the discrimination output. Sensitivity is easily adjusted and the current consumed during fire monitoring is not changed with different supply voltages.
Marks & Clerk
Nohmi Bosai Ltd.
LandOfFree
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