| 摘要 |
<p>A liquid level and specific gravity indicator which is capable of providing signals to a remote location is disclosed. The indicator has an upper section that contains a light source and a light sensor and a lower section which extends into the container being monitored. The lower section has a pair of light pipes each of which leads to a deflecting prism. Light rays from the light source pass along one of the light pipes, is reflected from one prism to the other and is passed along the second light pipe to the light sensor when the level and the specific gravity of the liquid is satisfactory. A floating ball contained in a channel acts as a shutter to block the light between the prisms when the liquid level or the specific gravity of the liquid is low. One or more porous filters over exterior openings in the ball channel preclude gas bubbles that could otherwise cause erroneous signals.</p> |
