To obtain a device with less troubles having the good response at a low cost without delaying the sucking speed of leaked gas even when the dilution amount for diluting the leaked gas having high concentration becomes much by arranging the diluting device in the vicinity of a gas sucking port.
A gas leakage sensor S is used for detecting the gas leakage from a gas pipe 9 embedded under the ground. For checking the presence or absence of the gas leakage from the gas pipe 9, a boring hole 14 is formed, and a gas sucking conductor 8 is inserted. Then, through the gas sucking conductor 8, the leaked gas is sucked by a sucking device 3 into a detection sensor 2 in a detector main body 7 through the gas sucking conductor 8 from a gas sucking port 8A at the tip of the gas sucking conductor 8. Since a diluting device 1 is arranged in the vicinity of the gas sucking port 8A, the sucking speed of the leaked gas becomes quick. As a result, the time lag of the concentration detection by the response delay of the detecting sensor 2 is not caused. Therefore, it is not necessary to adopt the two-pump system, and the increment in size of the device is suppressed.
| WO/1991/019971 | NOX SENSOR AND PROCESS FOR DETECTING NOX |
| JP4010681 | Gas leak detector |
KOSHIMIZU YUJIRO
MURATA KIYOSHI
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