Flame detection system with isolation between burner and electro

Details Flame detection system with isolation between burner and electro Flame detection system with isolation between burner and electro

1983-03-31

1985-05-28

Scott, Samuel

Combustion

Timer, programmer, retarder or condition responsive control

With test circuit checking or analyzing flame sensing...

431 78, 340579, F23N 500, F23Q 2300

Patent

active

045197717

ABSTRACT:
A method for detecting the operation of a burner uses the rectifying effect of the burner flame, when an alternating voltage is applied between the burner (1) and an electrode (2). A control device (18) is connected to the primary of an isolating transformer (6) which receives a high frequency alternating voltage from a generator (7). The current rectified by the flame provides dumping of the circuit at the secondary of the transformer which is used to detect the presence of a flame. An igniter (25) may be connected to the same electrode of the burner via an element (28) whose resistance varies with the voltage.

REFERENCES:
patent: 2170497 (1939-08-01), Gille
patent: 2313943 (1943-03-01), Jones
patent: 2379873 (1945-07-01), Lange
patent: 3614280 (1971-10-01), Yamaguchi
patent: 3902839 (1975-09-01), Matthews
patent: 4113419 (1978-09-01), Cade
patent: 4177033 (1979-12-01), Wallace
patent: 4238184 (1980-12-01), Schilling
patent: 4459097 (1984-07-01), Riordan et al.

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