PURPOSE: To provide a gas sensor which can measure the concentration of a gas, such as carbon dioxide contained in an always continuously flowing liquid like a carbonated spring even in the flowing state of the liquid.
CONSTITUTION: The title sensor is provided with a liquid current tube 3 which is provided with a liquid inlet 1 and liquid outlet 2 and has a rectangular cross section, cylinder 5 formed on the upper wall 4 of the tube 3 between the inlet 1 and outlet 3, air vent 6 formed through the cylinder 5, air passage 8 which is formed on the internal surface of the cylinder 5 and communicated with the side face and bottom surface of a piston 7, and blocking surface 10 which is formed below the opening 9 of the passage 8 and blocks the vent 6. In addition, valves 11 which respectively block the inlet q and outlet 2 when the surface 10 blocks the vent 6, airtight cell 12 formed of the valves 11 and piston 7, ultrasonic vibrator 14 incorporated in the tube 3 constituting the cell 12, and pressure sensor 15 which is provided above the vibrator 14 and faced to the vibrator 14 in the cell 14 are also provided.
KUSANAGI SHIGEKAZU
KAWAGOE HARUMORI
MORII SHOICHI
DOI KANEYUKI
MATSUGI SHIN
FUKUI MASANORI
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