Device for detecting flame in open-type combustor and oxygen den

Details Device for detecting flame in open-type combustor and oxygen den Device for detecting flame in open-type combustor and oxygen den

1981-06-26

1984-03-13

Barrett, Lee E.

Combustion

Timer, programmer, retarder or condition responsive control

By combustion or combustion zone sensor

431 37, 431208, 328 6, 340579, F23N 524

Patent

active

044365055

ABSTRACT:
A device for detecting the presence or absence of flame in a combustor and an oxygen density of room air used to operate the combustor. An ion current detecting sensor increases a flame ion current value in the combustor to an ion current value at which erroneous detection of the presence or absence of flame is prevented. A timer outputs a high level signal when combustion starts and starts a timer operation for holding the high level signal until the ion current is stabilized. Thereafter, the time outputs a low level signal which grounds a circuit to lower the flame presence or absence detecting ion current value detected by the sensor. A voltage comparator compares a flame presence or absence detecting ion-current developed voltage and a room air oxygen density detecting ion-current developed voltage with a predetermined reference voltage corresponding to a value at which both the presence or absence of flame and the oxygen density in the room can be detected to provide an output signal when the flame presence or absence detecting ion-current developed voltage or the room air oxygen density detecting iron-current developed voltage is larger than the reference voltage.

REFERENCES:
patent: 2705296 (1955-03-01), Weber
patent: 3879667 (1975-04-01), Kraty et al.
patent: 4125356 (1978-11-01), Ohashi et al.

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