This specific flue temp sensor is designed for the Burnham Alpine series

note that the contacts are not rated for electronic ballasts

This ASME Section IV certified safety valve is essential for preventing catastrophic pressure buildup in large-scale hydronic boilers

meaning it will interface with your current controller using the same sensor parameters

The T678A1361 is ambient compensated

Johnson Controls SEP81A-601R Power Element Refrigerant This specific flue temp sensorThe Johnson Controls SEP81A 601R Power Element is a high precision replacement component engineered for seamless integration with 2 inch and 2 1 2 inch V46 series valves. Designed primarily for industrial and commercial refrigeration applications, this power element is optimized for R22 and R502 refrigerant systems, ensuring accurate pressure regulation within a 160 to 260 psig range. For technicians managing high capacity cooling systems, the SEP81A