Combination temperature unit/intruder sensor utilizing common components
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United States of America Patent
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Jun 9, 1998
Grant Date -
N/A
app pub date -
May 29, 1997
filing date -
May 29, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A combination temperature unit/intruder sensor is described wherein the thermistor used for adjusting the sensitivity of a passive infrared detector in a microprocessor of the unit is also used for the secondary purpose of indicating whether the ambient temperature of a protected zone falls outside a pre-selected temperature range. The detector, in addition to providing signals indicative of an intruder, can provide indications of possible freezing, thawing, or fire conditions. Both the intruder detection and temperature sensing capabilities are provided in a single, inexpensive housing.
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