Propane Flame Projector Controller

Status
Not open for further replies.
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.
Click to expand...

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?
Click to expand...
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.
Click to expand...
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?
Click to expand...
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
Click to expand...
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
 
Status
Not open for further replies.

Similar threads

  • Question
Sun projector
2
Replies
32
Views
5K
shokjok
S
A
  • Question
Finally got my heat sensor / controller / heating element working.. now, how can I add an on/off switch?
Replies
1
Views
2K
ZipZapOuch
S
  • Question
Omnibus door controller build
Replies
4
Views
2K
Tony Stewart
R
  • Question
Need help with that cranky motor controller again ..... Sorry
Replies
17
Views
3K
ramblin
R
A
  • Question
Help putting together some off the shelf low voltage heating components
Replies
5
Views
2K
abapper
A
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…