R-C 100 provides safety on continuous, 24-hour burner applications for single burner as well as multi-burner applications. The dual/redundant self-check ultraviolet flame sensor and combustion safeguard control may be used only with 6642 Protectofiers, which have a 180-degree phase power supply. The system contains two UV tubes in one ultraviolet sensor to monitor one burner flame. Each UV tube is powered during a different time cycle to eliminate interference between the two UV tubes. It has no moving parts and displays high signal strength.