Check circuit for combustion process control timer

Details Check circuit for combustion process control timer Check circuit for combustion process control timer

1978-09-07

1980-12-16

Lowrance, George E.

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 15, 431 26, 431 73, F23N 524, F23Q 2300, F23Q 908, F23N 500

Patent

active

042394783

ABSTRACT:
A check circuit for checking operation of timers of a digital type combustion process control apparatus comprises flip-flops each having a preset terminal. The preset state of the flip-flops is inverted by an operation starting signal. The inversion is detected by a detector circuit the output signal of which is utilized for driving the control circuits for a combustion apparatus. The detector circuit is composed of a flip-flop circuit having input terminals applied with the operation initiating signal and the inverted output signal from the timer circuit.

REFERENCES:
patent: 3541549 (1970-11-01), Graves
patent: 3553664 (1971-01-01), Tucker
patent: 3574495 (1971-04-01), Landis
patent: 3849056 (1974-11-01), Schuss
patent: 3958126 (1976-05-01), Bryant
patent: 4078879 (1978-03-01), Dietz
patent: 4087046 (1978-05-01), Borucki
patent: 4101258 (1978-07-01), Jacobsz
patent: 4116613 (1978-09-01), Matthews

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