| 摘要 |
Has a housing(1) surrounding a probe(2). The housing(1) is designed to fill itself with liquid from the reservoir when it is submerged in the liquid, The housing has an input(4), into which liquid is introduced during the control of the detector, a liquid evacuation orifice(6), which is smaller than the input pipe(4), and means(7), consisting of a physical barrier, for preventing any contact between the liquid and the probe sufficient to activate the detector, except that due to the filling of the housing with the liquid. The physical barrier includes an internal screen separating the probe from the introduced liquid, or an envelope(7) surrounding, which has an opening at the level of or near to its lower end, so as to permit input of the rising liquid level..
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