Resistive water sensor for hot tub spa heating element
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United States of America Patent
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-
Nov 5, 2002
Grant Date -
N/A
app pub date -
Sep 25, 2000
filing date -
Sep 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dry fire protection system for a spa and the spa's associated equipment. A heating element heats the spa's water. A resistive water level sensor senses that the level of water around the heating element is higher than a predetermined height or lower than a predetermined height, and a heating element deactivation device electrically deactivates the heating element when the water level around the heating element falls below a predetermined level. In a preferred embodiment, the heating element deactivation device is an electric circuit comprising a comparator circuit and a control circuit.
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