>There are small IR detector IC's available for under $5.00, but you would >have to build a power circuit since most run on 1.5 to 5 VDC. >Allen G. Wiesner ++++++++++++++++++++++++++++++++++++++++++++++++++++++
Xerox used some IR detectors in one of their copiers back in the 70's. When it detected flame it would fire off a large firebottle. The system was a bit unreliable so guess what they converted to. A monofilament line (fishing line). It was strung across the heat roll area with one end secured and the other end attached to a switch actuator with the switch wired through the normally closed contacts. The line held the switch actuated with the normally closed contacts open and when a fire would melt the line it tripped the firebottle. Worked every time. Just size the line for the "burn time". Larry Flesner
