At 05:00 AM 9/11/2010, Peter wrote: >Dwayne Reid planet.eon.net> writes: > > I think that you are missing the point - there can't be any flame if > > there is no spark because without spark, the fuel supply must be disabl= ed. > >Hmm. I see, it is a chicken or egg problem in your case. > > > In other words, I have to prove that spark exists before the fuel > > supply is allowed to be enabled. > > > The other requirement is that the spark proving system must be > > approved by either CSA or UL. I can't 'roll my own' system without > > submitting it for approval. > >Can't you cheat a little? Use a certified IPI controller and your system >too, on top of it? I mean the requirement is for the pilot igniter to >be always on but if you provide a second igniter for the main flame >you are still within specs as far as the regulator is concerned no? In >fact you would be over-engineering the system? > >I mean have a normal IPI and its spark gap and pilot light, and its >main gas valve control output enabling a main gas valve and your system >modulating a second fast gas valve after it and igniting it supplementaril= y >with a second spark gap. My situation is an interesting problem. The fuel supply is liquid,=20 and normally considered to be non-flammable until it is=20 atomized. The fire department people REALLY like this system,=20 especially compared to the more normal propane and LNG systems these=20 guys also use. It is far safer than either propane or LNG. But - bottom line is that there is no pilot flame, and no gaseous=20 fuel supply available for a pilot flame. > > That's what it looks as if we are going to have to do. Design it, > > make sure that it works properly, then pony up the several thousand > > dollars for certification. > >That looks expensive. Also it would have to be done for each country afaik= .. It *is* expensive. We are right now in the process of finding out=20 just how expensive its going to be. We plan to get certification for use in both Canada and USA. That=20 pretty much covers our anticipated customer base. We'll worry about=20 EU certification if and when it comes up. Thanks for your thoughts! dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .