Propane Flame Projector Controller

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How about home-brew heating elements made from coiled nichrome wire (toaster/electric fire element), running off 24VAC?
 
4pyros said:
You can not test for flame rectification without AC power.
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True, but you can test for flame conduction. Flames conduct in both directions, but better in one direction, which accounts for the DC offset/rectification that is often used. However, that use is often in a situation when AC is readily available. If AC is not available, then DC will conduct when there is a flame and not conduct when there isn't. Here is a patent using DC: https://www.google.com/patents/US2684115

John
 
alec_t said:
How about home-brew heating elements made from coiled nichrome wire (toaster/electric fire element), running off 24VAC?
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Alac; I am thinking about it.
I would call it a Hot Wire Igniter.
 
Thanks John; I will look into that.
 
Seems it has been done before but needs lots of power.
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Yes, it will need lots of power. The gas blowing on the hot wire will cool it! I expect whatever you use will need a fair bit of power .
 
Any idea how this works?
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I would hazard a guess that the 'transformer' at bottom left plus a few adjacent components form an inverter putting out a high voltage (>1kV?) which is applied to the probes. Conduction between the probes when ions in a flame are present would then be detected by the rest of the circuit to energise the relay at bottom right.
 
I am not entirely sure high voltage is needed, I saw one schematic that ran off 12 volts but could not find much info on it.


 
A Google of "uv flame detector" will bring up some of what I mentioned. However, the suckers aren't cheap
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I finally found this and yes not cheep about $50!
**broken link removed**
 
The IR sensors I have seen are about $100 for a sealed unit and around $20 for a hobby board that could melt.
 
Thats really cool! I vote IR as well, I use IR transistor detectors on my railway, if you put them down a small dark tube a little way then they are pretty immune to outside light and very directional
 
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