| 摘要 |
PROBLEM TO BE SOLVED: To sense a fuel leakage at an oil feeding route from an electromagnetic pump to a vaporizer difficult to visual inspect by comparing a sensed flame current value with a predetermined flame current value, and sending a signal of continuation or stop of operating the pump to a driving circuit of the pump in response to a high or low amplitude of the current value. SOLUTION: When an operation switch of the combustion equipment such as a petroleum fan heater or the like is turned ON, a vaporizer heater is started to be energized. A temperature of the vaporizer 5 is sensed by an attached thermistor. When the temperature arrives at a set temperature, kerosene 2 in a fuel tank is fed under pressure to the vaporizer 5 through an oil feed pipe 4 by an electromagnetic pump 3, and burned by a burner 7 surrounded by a combustion chamber 6. Then, a change of a combustion state when a combustion is continued for one minute by a maximum heating amount is sensed by a flame sensor 11, and compared with a preset flame current value by a microcomputer. If the flame current value is a preset flame current value or below, it is decided that a leakage occurs at an oil feed passage from the pump 3 to the vaporizer 5, and its operation is stopped.
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