| 摘要 |
Apparatus is provided for indicating when the water level rises to a predetermined height, of the type that includes a float assembly (44) with a float that rises along a guide of a fixed housing assembly (40) until an activator (74) on the float assembly activates a switch (70) on the housing assembly. The guide is in the form of a downwardly-extending post (42), and the float assembly includes a hollow shaft (52) that extends upwardly from the float and that surrounds the post. As a result, the sliding surfaces (60, 62) along which the float assembly slides upwardly along the post, is isolated from the environment to ensure reliable sliding despite a hostile environment that could damage any exposed sliding surfaces and prevent reliable sliding.
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