| 摘要 |
<p>The limit switch (1) includes a probe tube (2) which is installed vertically, and a liquid sensor (3) which is air-tightly adjoined at the lower end (2a) of the probe tube. A downwardly open longitudinal plastic sleeve (4) is further arranged at the lower end of the tube. A downwardly open longitudinal slot (5) is arranged at the edge of the plastic sleeve, according to the level of the sensor. The slot is covered with two metal layers.</p> |
