Leak detector, leak detection method, and plant to which the leak detector is applied

摘要

PROBLEM TO BE SOLVED: To obtain a leak detector, whose constitution is made compact and which can be installed by being inserted directly into an apparatus, in which the meter is to be installed, by a method, where the gap between the inside of a protective pipe surrounding a solid electrolyte-type sensor and the outside of the sensor is formed as a flow passage of the fluid to be detected. SOLUTION: This leak detector 1 is constituted, in such a way that a sensor part 2 composed of a solid electrolyte-type sensor is provided at the inside and that the circumference of its support pipe 3 is surrounded by a protective pipe 4. A heater 6 heats a fluid to be detected, which flows into from a fluid entrance, and the gap between the support pipe 3 and the protective pipe 4 is formed as the flow passage 7 of the fluid to be detected. The heated fluid to be detected is moved upward along the flow passage 7 and flows out to the outside of the leak detector 1 from a fluid exist 8. In the sensor part 2, a comparison gas is filled into a comparison-gas filing part 9 which is under predetermined pressure. Electromotive force is generated according to the difference between its pressure and the pressure of the same kind of gas obtained in the fluid to be detected, flowing in the flow passage 7. A voltmeter 10 measures the electromotive force, and a termometer 11 measures the temperature of the fluid to be measured, which passes through the inside of the flow passage 7.