| 摘要 |
The invention concerns a system and a method of monitoring live beings, which combines zone and water alarms, including an alarm unit to be arranged on a being's body and a portable alarm centre handled by a person that monitors the being, wherein the alarm unit includes a sender for continuous wireless transfer of intermittent signals on a first channel and transfer of an arbitrary type of signal on a second channel, and wherein the alarm centre receives signals sent from both channels for status monitoring of the alarm unit. Activation of an alarm is achieved in the alarm centre when the intermittent signal differs from a predetermined intermittent signal state. The arbitrary type of signal is sent on the second channel or channel 2 when a water sensor, included in the alarm unit, detects contact with a predetermined quantity of water. Signaling on the first channel is turned off by a switch in the alarm unit when the arbitrary type of signal is sent to the alarm center. A normal state for monitoring is within a distance zone from the alarm center when the intermittent signal is in the mentioned predetermined signal state, and the risk of a drowning accident exists when the arbitrary type of signal is emitted on the second channel, wherein a drowning accident alarm is activated in the alarm center, and wherein the switch turns off the intermittent signal. This means that the system has raised the alarm twice for a drowning accident through the prevailing signal states on both channels. A third drowning accident alarm is achieved in that the signal on the second channel does not reach the alarm center when the alarm unit is located at a sufficiently great depth of water.
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