| 摘要 |
PURPOSE:To obtain a measured value with a high reliability by determining the pressure in an air transmission pipe when gas forced from the upper end thereof inserted into a liquid to purge all the liquid out of the air transmission pipe to compute the value from the pressure value and the specific gravity of the liquid. CONSTITUTION:When measuring the liquid level, first, an operating valve 7 is opened and a pressurized gas 4 is forced into an air transmission pipe 3 to purge the liquid 2 in the air transmission pipe 3 with a gradual rise in the pressure therein 3 causing the liquid level therein 3 to lower. Then, when the liquid level in the air transmission pipe 3 reaches the lower end of the air transmission pipe 3 and bubbling is just taking place at the lower end thereof 3, the operating valve 7 is closed to stop the feeding of gas 4 under pressure. Then the pressure in the air transmission pipe 3 is measured with a manometer 5. Based on the current pressure and the specific gravity of the liquid 2, the height H to the liquid level from the lower end of the air transmission pipe 3 can be determined by a well-known formula. |
