Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-08-23
1981-09-01
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250381, G08B 1710
Patent
active
042875161
ABSTRACT:
A combustion products detection apparatus and method are provided. The apparatus is powered by an energy source which provides a relatively low DC output voltage. This DC voltage is multiplied by a voltage multiplier circuit in conjunction with a first oscillator having an output of a first predetermined frequency. The output voltage of the voltage multiplier circuit is applied to a combustion products sensor circuit. Upon detection of a predetermined concentration of combustion products in the region being monitored by the sensor circuit, a second oscillator is enabled. The second oscillator has an output of a second predetermined frequency which is a greater frequency than the first predetermined frequency. The second predetermined frequency output controls the voltage multiplier circuit when the predetermined concentration of combustion products is present. A greater amount of current is thereby delivered to the load of the apparatus when the predetermined concentration of combustion products is present thereby assuring proper indication of the presence of the combustion products.
REFERENCES:
patent: 4096473 (1978-06-01), Sweany et al.
Caldwell Sr. John W.
Emerson Electric Co.
Myer Daniel
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