US PATENT SUBCLASS 431 / 25
.~.~ Utilizing unidirectional electrical conducting effect of flame

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
24  DF  .~ With test circuit checking or analyzing flame sensing circuit for malfunction {2}
25.~.~ Utilizing unidirectional electrical conducting effect of flame

DEFINITION

Classification: 431/25

(under subclass 24) Apparatus in which the circuit has one response to the flow of current through a gap device in the flame area when the current has been changed from alternating to direct by the rectifying effect of the flame and another response to an unrectified current which is an indication of a short circuit at the gap or some other abnormality in the sensor circuit.

SEE OR SEARCH CLASS

340, Communications: Electrical,

579, for an electrical communication system of general utility in which a flame sensor responds to the ionization or rectification properties of a flame.