How does a flame sensor work?

Answer

A flame sensor works by sensing the temperature of an igniter. When the igniter reaches a certain temperature the sensor opens the valve which then causes the igniter to ignite. This is used in gas appliances like a dryer. You can find more information at www.appliancejournal.com
Q&A Related to "How does a flame sensor work?"
Generally its either by thermocouple or flame rectification. Tc is where a probe is heated and a small microvoltage differential appears between the outher and inner core usually
http://www.quora.com/How-does-a-flame-sensor-work
Flame sensors, whether they are used in a home furnace or on a large industrial boiler, indicate the presence of a flame and are part of the safety circuit. If the flames go out and
http://www.ehow.com/how-does_4924695_furnace-flame...
Its not a flamesensor its a pilot generater it generates a small amound of electricity to open the main valve that way if your pilot light goes out it wont let gas escape and couse
http://wiki.answers.com/Q/How_does_a_flame_sensor_...
Cadmium sulfide photocell sensor is a high resistance semiconductor which conducts when light is sensed in a distance. Resistors connected in series may interpret color soignal it
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2 Additional Answers
A flame sensor is basically a safety mechanism that resided in furnaces or boilers in home, it acts to send a signal to the furnace telling it to light or not light the furnace.
In order for a flame sensor to work the sensor must be able to see the flame at all times. It does not have to be in constant contact with the flame. When the flame sensor is engulfed by the flame, the AC voltage is rectified and a DC current is produced. Most sensors are equiped with a filter to keep the flame view clear for accurate readings. The ignition control module has a curcuit to detect the DC current and closes the relay when it is verified that the burner is properly lit.
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