Good day to all. Its a long shot, but I thought that I'd ask here. A company I work with has developed a new flame effect system that is=20 now in use. Its actually really cool, but that's not really relevant=20 here. Later, maybe. Anyway, the flame is ignited with a spark gap fed from a standard=20 spark ignition transformer such as those used in natural gas=20 appliances. The spark is monitored with a commercial flame control=20 system that uses a UV sensitive sensor. The problem is with the UV flame sensor. Its actually quite=20 sensitive and can get false-triggered even when there is no spark if=20 the system is being used outdoors. That's causing us some grief. What I want to do is change to using a system that monitors the spark=20 directly. That is: it would monitor for spark current in the ground=20 electrode. If spark is present, fuel flow is enabled. This system uses continuous spark - the spark is operating anytime=20 flame is being called for. That makes spark proving a viable option=20 for safety. The problem is that I can't find any spark proving systems that don't=20 rely on a UV sensor. That might be because I'm using the wrong=20 search term ("spark proving" or "spark proving system") or it might=20 be because I'm looking in the wrong places. I'm hoping that someone here might be able to offer search or product=20 suggestions. If worst comes to worst, I can build something. I've actually got a=20 design in mind - it looks to fail-safe under all conditions and will=20 pass the multiple-failed-components test. The problem is the cost of=20 getting it approved. If it turns out that someone doesn't make a spark proving system, I=20 guess that's the way I'll go: build it and get it approved. I should=20 be able to sell more of these in the future if no one currently makes=20 these units. 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 .