Control system with timer redundancy
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United States of America Patent
Stats
-
May 23, 1989
Grant Date -
N/A
app pub date -
Sep 10, 1987
filing date -
Sep 10, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fail safe control circuit for supplying gas to a burner is disclosed and includes a plurality of timers, two of which set upper and lower bounds on a window or acceptable time interval during which a third timer must issue a control signal for that signal to be valid. The timers are operated from at least two different sources of timing signals so that a failure of either source of timing signals as well as a malfunction of any one of the three timers will result in an invalid control signal and the control will lock out to preclude burner operation.
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