Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-07-22
2000-12-05
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
340539, 340604, G08B 2300
Patent
active
061573035
ABSTRACT:
The present invention relates to a portable water safety monitoring device including a transmitter to be worn on a person, and a base station for monitoring any transmission from the transmitter indicating immersion of the transmitter in water. The device is particularly applicable for monitoring children near a swimming pool or other body of water to prevent drowning accidents. The transmitter is a compact printed circuit board carrying a capacitance water sensor and a sealed circuitry for detecting a change in capacitance and transmitting an alarm signal to the base station. Advantageously, on opposing sides of the printed circuit board large perimeter conductors provide a sensor able to register a varying level of capacitance. This can reduce false alarms due to incidental wetting. As a further advantage, the use of a compact printed circuit board eliminates any exposed leads in the construction, which could be damaged or disconnected by a child deactivating the monitor. A masked encapsulating sealant protects the circuitry from exposure to water while the sensor remains exposed. The design achieves additional compact efficiency by using one of the perimeter conductors as an antenna for transmitting the signal.
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Bodie John
George Douglas
Gibson Scott
Lee Benjamin C.
Terrapin Communications Inc.
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