the 621709R is built with high-grade laminations to minimize heat rise and vibration noise during high-demand cycles

The unit includes captive trippers that cannot be lost

making it easy to identify during maintenance or inspection

Rugged Construction: Built to withstand the high-temperature environment of a gas boiler draft hood without premature failure or drift in sensing accuracy

KMC Controls STE-1412 Duct Sensor 30067439-890 the 621709R is built withThe KMC Controls STE 1412 is a high precision 12' copper averaging duct sensor designed for accurate temperature monitoring in large commercial air handling units and ductwork. Utilizing a 10,000 ohm Type III thermistor, this sensor provides reliable resistance data to BAS and HVAC controllers, ensuring optimal thermal management across the entire duct cross section. The bendable copper probe features a 5 16 inch O. D., allowing technicians to