Auburn CS-13044 FRS-3 PX21 21” Flame Rod Sensor

The Auburn CS13044 FRS-3 flame rod sensor is a 22.50-inch flame-detection probe designed for reliable flame sensing in industrial burners, boilers, and ovens. It features a 12.75-inch center electrode mounted inside a ceramic insulator, with 7.19 inches of ceramic length measured from the bottom of the thread, and uses a 1/2-14 NPT mounting thread with a 15/16-inch hex head and an adjustable nut to position the tip in the flame. The electrode is Nichrome, selected for stable conductivity and high-temperature resilience in combustion environments. This FRS-3 unit is compatible as a direct replacement for Crown CA410 and Maxon 27634, with Westwood E5-FRS-3 listed as a cross-reference, making it a common choice when retrofitting or stocking spares for Auburn ignition systems. The overall length is 22.50 inches, with the electrode itself measuring 12.75 inches, allowing installation in deeper assemblies while maintaining flame contact. Rated for high-temperature operation, it supports service in environments reaching up to 2100°F (1149°C), which suits demanding flame-sensing tasks in industrial firing applications.