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A flame rod is a simple piece of heat-resistant metal (nichrome, inconel, etc) in contact with a flame. A flame consists of ionized particles undergoing chemical reactions and therefore is conductive. The flame rod takes advantage of that fact. The rod has a small potential on it and when the flame touches it, a small current flows from the rod through the flame to ground. This current is detected and uses to "prove" the flame. A flame acts as a diode but I don't recall the direction of electron flow and that effect isn't used in this application. The rod's response is instantaneous. That, and there being nothing to degrade, are the two main benefits. The major detraction is that active, powered electronics are needed to process the signal. All pilotless gas systems use flame rods. If the ignition system is by spark then the flame rod and the ignition rod may be the same. Other systems use separate spark and flame rods. Yet other ignition systems such as the hot body ignitor don't involve the use of sparks at all. A similar application is the pilot light sustainer. This little gadget detects when the pilot light goes out and sparks to relight it.
What else can I help you with?
How do you check a flame rod?
To check a flame rod, disconnect it from the control circuit and use a multimeter set to read resistance in ohms. Insert one probe into the terminal of the flame rod and the other probe to the metal rod itself. A good flame rod will typically have a resistance reading between 3 to 30 ohms. If the flame rod shows no continuity or a significantly high resistance, it may need to be cleaned or replaced.
Wrap a thin paper strip tightly around an iron rod . try to burn the paper with candle while rotating the iron rod continuously . does it burn .explain your observation?
If you introduce the rod with the round strips into the flame of a candle, the paper will not catch fire. The fire will lick the paper but not burn down until the iron rod becomes hot. This is because iron rod just like any other metal is a good conductor of heat, it leads away the heat obtained by paper from the candle flames. Replace the iron rod by a wooden stick and paper will burn because wood is a poor conductor of heat. With copper rod the experiment is more successful.
How do you produce such flame?
Burn hydrogen
What color does helium burn in a flame test?
Helium does not burn in a flame test because it is an inert gas and does not react with the flame to produce a characteristic color.
When you hold a metal rod over a flame the end of the rod away from the flame gets hot how does this happen?
Metals generally exhibit good thermal conductivity. When one end of the metal rod is held in the flame it absorbs thermal energy and becomes hot. Thermal energy is conducted quickly along the material (from hotter to cooler parts of the rod), and the other end eventually becomes hot. This principal is used in cooling systems for electronics (for example) with heat sinks drawing thermal energy away from hot components in order to radiate it elsewhere.
Why is a yellow flame observed when glass rod heated?
The yellow flame observed when heating a glass rod is due to the presence of impurities on the surface of the rod, such as residual organic materials or contaminants. When these impurities are heated, they undergo combustion and emit a yellow-colored flame. Heating the glass rod to a higher temperature can help burn off these impurities and restore a clear flame.
What does a flame need to burn?
For a flame to burn it needs fuel, oxygen, and heat.
How do you check a flame rod?
To check a flame rod, disconnect it from the control circuit and use a multimeter set to read resistance in ohms. Insert one probe into the terminal of the flame rod and the other probe to the metal rod itself. A good flame rod will typically have a resistance reading between 3 to 30 ohms. If the flame rod shows no continuity or a significantly high resistance, it may need to be cleaned or replaced.
How does a flame rod work?
The main circuit board in your furnace sends a small ac signal to the flame rod so now you have an ac potential from the body of the furnace to the flame rod, When the flame comes on between the body of the furnace and the rod it rectifies the ac in to dc, The flame actually acts like a diode. When this dc voltage is sensed by the control board it knows there is a flame present and thus keeps the gas valve on. Hope this helps
What will not burn?
flame retardant
What will burn?
flame retardant
Wrap a thin paper strip tightly around an iron rod . try to burn the paper with candle while rotating the iron rod continuously . does it burn .explain your observation?
If you introduce the rod with the round strips into the flame of a candle, the paper will not catch fire. The fire will lick the paper but not burn down until the iron rod becomes hot. This is because iron rod just like any other metal is a good conductor of heat, it leads away the heat obtained by paper from the candle flames. Replace the iron rod by a wooden stick and paper will burn because wood is a poor conductor of heat. With copper rod the experiment is more successful.
What homophone means to burn with sudden flame?
A word that means to burn with sudden flame is flare. The homophone for flare is flair. Sear can also mean to burn with a sudden flame, and its homophone is sere.
Why do you have an olympic flame?
to burn ppl
How do you produce such flame?
Burn hydrogen
Why you have an Olympic flame?
to burn ppl
Does the Bunsen burner flame roar or burn quietly?
A Bunsen burner flame can both roar and burn quietly, by allowing more oxygen to reach the flame by opening a valve it will roar, by closing the valve the flame will flicker
