Multi-station RF thermometer and alarm system
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United States of America Patent
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-
Apr 4, 2000
Grant Date -
N/A
app pub date -
Nov 12, 1997
filing date -
Nov 12, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-station RF thermometer and alarm system measures temperatures at remote locations by RF thermometers, and displays received temperature telemetry on a multi-station base station that provides out-of-bounds alarm signal indications whenever temperatures are outside of user-selectable minimum and maximum values. Randomized transmission times lessen the possibility of on-going collisions between two or more transmitters contending for the base station at the same time. Redundant data transmission lessens the possibility of environmental noise interference. The redundant data transmitted at random times includes a unique channel ID code, house-keeping data, the current temperature and/or time-to-next-transmission data. The temperature sensing transmitters operate at a low duty cycle with low peak current consumption resulting in long battery life. The multi-station base station may be AC- or battery-powered. Channel and station ID switches are provided on the remote temperature sensing transmitters and on the multi-station base station.
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