| 摘要 |
In a leak detector of a kind suitable for mounting externally of a flexible hose to detect leakage of fluid through at least a part of the hose and generate a warning signal in response thereto, test means is provided for checking the operating capability of the detector. The test means is of a kind operable from outside of the detector, for example by means of a magnet or an ultrasonic signal. Accordingly particularly when the leak detector is used in underwater situations the operating capability of the detector may readily be checked in situ.
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