| 摘要 |
PURPOSE:To improve extensive usability, by detecting the position of a liquid level by the increase in internal pressure; when a gas is supplied into a tubular body, which has a gas supplying means and a gas pressure detecting means and is provided with a hole at the lower end, and the lower end approaches the liquid or it is contacted with the liquid. CONSTITUTION:A cylinder control part 10 is operated. A compressed gas is sent into a cylinder 7 from a cylinder gas supplying port 11. A piston 6 are a tubular body 4 are lowered by said pressure. At this time, the gas is exhausted from a lower end hole 3 and a gas pressure measuring hole 2 of the tubular body 4. The tubular body 4 is gradually lowered. When the lower end approaches the liquid or it is contacted with the liquid, the pressure that is applied to the hole 3 is increased. Therefore, the amount of the gas exhausted from the gas pressure measuring hole 2 is increased. The pressure of the gas exhausted from the measuring hole 2 is measured by a gas pressure detector 12. When said pressure becomes a preset value or more, the point is made to be the liquid level. |
