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Device for a bed alarm

Image Number 3 for United States Patent #7916035.

The invention relates to a device (1) for an alarm (2) intended for beds (3) and similar locations that, e.g., old people, demented or handicapped persons are arranged to stay on and that is formed of a sensor (7) distributed on the bed and coupled to a monitoring unit (6) that is arranged to provide alarming. The sensor (7) is arranged to co-operate with a radio receiver (9), positioned remotely from the sensor (7), via radio communication, and is formed of a unit that is arranged to measure the difference of the capacitance of a medium in a compressed and in a free state, respectively. The sensor (7) is formed of a compressible plastic core having a conductive gel applied on at least one side thereof and that is covered, on each side, by an electrode each.

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