The Siemens Duct Point Temperature Sensor monitors and transmits changes in duct air temperature to the building's control system. It provides accurate, reliable indication of duct temperature. The sensor's resistance varies proportionally to the actual duct air temperature being measured. It is well suited for applications such as heating and cooling, morning warm-up/cool-down, and monitoring discharge air temperature This sensor has an NTC 10000-Ohm Type sensing element, an 8-Inch probe, and a 2 x 4 electrical box housing construction.