Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-01-04
1990-02-27
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250554, 431 79, G08B 1712, F23N 508
Patent
active
049049860
ABSTRACT:
A flame detector, for use with a photocell which produces a flame signal when the photocell is exposed to a flame, is used for detecting the presence of a flame. An input circuit is coupled to the photocell for receiving and buffering the flame signal. The buffered flame signal is filtered and amplified in a filter. An output circuit further amplifies the filtered flame signal providing an output flame signal. A switch is also used in the flame detector for substantially short circuiting the flame signal to a known value upon receiving a switch-close signal from either a test computer or from a hot refractory detection circuit. A flame-out condition is detected by the hot refractory detection circuit which generates an HRD signal causing the flame signal to be substantially short circuited to a known value thereby eliminating a false flame signal caused by hot refractory shimmering.
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Honeywell Inc.
Mullen Jr. Thomas J.
Swann III Glen R.
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