POOL ALARM

摘要

A safety device for detecting the introduction and/or presence of a foreign body or object in or on a body of liquid. The safety device firstly comprising a first liquid-communicating detection means for detecting a first parameter from the liquid, said first parameter being indicative of the possible introduction and/or presence of a foreign body or object in or on the body of liquid. Secondly the device comprises a second air-communicating detection means for detecting a second parameter from the air located around the liquid, said second parameter being indicative of the possible introduction and/or presence of a foreign body or object in or on the body of liquid. Finally the device comprises an indicating means, which indicates the introduction and/or presence of a foreign body or object in or on the body of liquid only in the event at least both said first and second parameters are detected by said first and second detection means respectively.