It handles both the initial electrical spark ignition of the gas burner and continuous thermal flame detection
After sparking, the sensor verifies the physical presence of a stable flame to allow continuous fuel delivery and prevent unsafe gas buildup
MFG# 2528420
California residents: Prop 65 Warnings
Warning
WARNING: This product can expose you to chemicals which is known to the State of California to cause cancer, or birth defects, or other reproductive harm. For more information, go to http://www.P65Warnings.ca.gov/