| 摘要 |
PROBLEM TO BE SOLVED: To provide a bubble type level gage generating few failures with a simple structure, requiring little consumption of compressed air, having no pulsation of the compressed air and no fluctuation of an indication value, and capable of stable display. SOLUTION: This level gage has an air supply pipe 12 at least whose lower end is sunk into liquid 14 in a tank 10, a compressed air supply source 34 for supplying the compressed air into the air supply pipe 12, a pressure sensor 54 for measuring the pressure in the air supply pipe 12, and a display part 58 for displaying the liquid level in the tank 10 based on a detection signal by the pressure sensor 54. The level gage also has the first solenoid valve 65 for opening/closing a compressed air supply route from the compressed air supply source 34 to the air supply pipe 12, and the second solenoid valve 66 for opening/closing a pressure detection route from the air supply pipe 12 to the pressure sensor 54. In an air supply mode wherein the first solenoid valve 65 opens the compressed air supply route, the second solenoid valve 66 closes the pressure detection route, and in a measuring mode wherein the second solenoid valve 66 opens the pressure detection route, the first solenoid valve 65 closes the compressed air supply route. COPYRIGHT: (C)2006,JPO&NCIPI
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