| 摘要 |
For the apparatus and method to measure the water depth and level using a gas bubble type level meter, the measurement pipe for water column pressure is composed of plastic pipes of inside diameter of 2-4 mm; two measurement pipes for water column pressure are bounded that the elevation difference between the ends of two measurement pipes for water column pressure is DELTA h; the upper ends of two measurement pipes for water column pressure are connected to the buffer tank using valves; the pressure sensor to measure the gas pressure in the buffer tank and the temperature sensor to measure the gas temperature in the buffer tank are installed; the supplying pipe of compressed gas with a valve is connected to the buffer tank; the outputs of pressure sensor and temperature sensor are sent to the apparatus to calculate the specific gravity, water depth and level; the level calculating apparatus contains an apparatus to convert displayed and calculated values of level to electrical or coded signals, and an apparatus to store the elevations of the upper and lower ends of the measurement pipes for water column pressure, elevation difference between the lower ends of the measurements pipes for water column pressure, elevation of reference point for level measurement, pressures and temperatures of compressed gas used at the reference state and the specific gravity of gas at the reference state; for case of automatic measurement, the valve controller is connected with valves which the valve connected to a long measurement pipe for water column pressure is opened, the valve to supply the compressed gas is opened, the valve connected to a long measurement pipe for water column pressure is closed and the valve connected to a short measurement pipe for water column pressure is opened; Then, this is the measurement method to measure water depth and level with significantly decreased water depth measurement error through the compensation of air (gas) column pressure and specific gravity of water (liquid). When measuring the water column pressure with submerged pressure sensors, the level is measured through the measurement of specific gravity of water by installing the two pressure sensors at the interval of DELTA h.
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