At 12:57 PM 9/1/2010, Marcel Duchamp wrote: >It may be hard to find because it is an indirect measurement of flame >presence. It only tells you if spark current is going somewhere. A >fault in the HV cable insulation allowing a spark to ground won't be >detected and in that case there will be no spark at the ignitor. Actually, that's not the case. I will be monitoring the ground side of the spark=20 gap. If the arc is going somewhere else, no=20 current will flow on that electrode. The reason for monitoring spark rather than flame=20 is that the fuel does not actually begin to burn=20 until it is about 10 inches past the spark gap. The velocity is that high. >What brand is the uv flame sensor? I have a Hamamatsu "R2868 FLAME >SENSOR UV TRON=AE R2868" that works fine in broad day light - in direct >sun light, it does not fire. But a BIC lighter at 15 feet away is detecte= d. Thanks for the suggestion - I will check it out. Many thanks! 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 .