Siemens QFM2120 DUCT RH AND TEMP SENSOR, 5 PERCENT, RH: 0-10 VDC, T: 1K OHM NICKELSiemens QFM2120 Duct RH and Temp Sensor, 5 percent, RH: 0 10 Vdc, T: 1K ohm Nickel This Q Series Duct Relative Humidity and Relative Humidity Temperature Sensor monitors and transmits changes in humidity and temperature to the building control system. This unit is especially suited for applications where precise, stable humidity sensing is required. This sensor has a 5 percent accuracy rating, a 0 to 10 Vdc humidity output signal, and a 1000 ohm