| 摘要 |
A system for detecting the presence of a burner flame in which the flame heats a thermocouple which is connected to the emitter of a transistor. The transistor is connected to conduct heavily when the thermocouple is cold and to conduct less heavily when the thermocouple is hot. A circuit which generates periodic pulses of voltage is connected to the transistor to cause it to conduct heavily upon the occurrence of each pulse, thus causing a substantial change in the conduction of the transistor only when the thermocouple is hot. This change in conduction generates a control voltage which is used to activate a control relay to control the flow of fuel to the burner.
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