Automatic ignition and flame detection system for gas fired devi

Details Automatic ignition and flame detection system for gas fired devi Automatic ignition and flame detection system for gas fired devi

1981-04-28

1983-09-06

Scott, Samuel

Combustion

Timer, programmer, retarder or condition responsive control

Sensor of electrical condition or temperature of electrical...

431 71, 431 72, 361264, F23N 500

Patent

active

044026633

ABSTRACT:
Improved automatic ignition system (10) for gas fired devices such as boilers, clothes dryers, ranges, and the like. The system (10) is of the type including a variable resistance ignition means (16) having a particular temperature characteristic disposed in proximity to the burner (14) for igniting gas flowing therethrough when the ignition means (16) is energized. The improved system includes detection means (12) for repeatedly measuring the resistance of the ignition means (16) and for comparing such measurements, and activating means (12) for activating the gas valve opening means (56) to open the valve (60) when the detection means (12) establishes that the ignition means (16) is in the portion of its temperature characteristic where the temperature thereof is sufficient to ignite gas. The preferred system (10) also includes means (12) for detecting a flameout, means (22) for detecting a low gas pressure condition, and visual means (28) for indicating system status as well as the existence and nature of system malfunctions.

REFERENCES:
patent: 3620659 (1971-11-01), Fox
patent: 3649154 (1972-03-01), Palmer et al.
patent: 3784351 (1974-01-01), Wolfe et al.
patent: 4188181 (1980-02-01), Rippelmeyer et al.
patent: 4289476 (1981-09-01), Visos et al.
patent: 4298355 (1981-11-01), Riordan et al.

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