| 摘要 |
<p>1. Electric switch triggered by immersion, comprising at least two electrodes (1) and (2) placed inside a casing (3, 23) and adapted to be electrically connected by the aqueous medium in which the switch in immersed, said electrodes being connected to an electronic circuit (4) preferably including at least one thyristor (4a) whose triggering threshold is reached when the aqueous medium connects the two electrodes (1) und (2), characterized in that on the one hand the casing (3) has at least one opening closed by a filter (5, 25) through which the aqueous medium can pass only when it is at a pressure whose value is at least 1000 Pa (0,01 bar) higher than the value of the pressure prevailing in the inside chamber (6, 26) of the switch, and in that on the other hand the distance between the two electrodes (1) or (2) and the inside surface of the filter (5, 25) is less than 3 millimetres.</p> |
