Combustion – Timer – programmer – retarder or condition responsive control – By sensing of gas leakage – flashback or escaped flame
Reexamination Certificate
2005-06-21
2005-06-21
Price, Carl D. (Department: 3749)
Combustion
Timer, programmer, retarder or condition responsive control
By sensing of gas leakage, flashback or escaped flame
C431S076000, C431S006000, C431S013000, C431S016000, C122S504000
Reexamination Certificate
active
06908300
ABSTRACT:
An apparatus comprising a switch, a fuse, and a sensor that is capable of detecting the presence of flammable vapors and responsively changing in resistance, wherein the sensor enables the switch to supply current to the fuse which opens to shut down an appliance burner. The fuse is connected in series with a control circuit that enables a gas valve to supply gas to the burner.65The apparatus comprises a voltage divider circuit that includes the sensor, which upon exposure to flammable vapors, increases in resistance to provide a voltage input to the gate of a FET100. The FET switches on and conducts a current that blows the fuse to interrupt the appliance burner control circuit and shut down burner operation.
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Emerson Electric Co
Price Carl D.
Pumm Kevin
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