Siemens Building Technology QFM3171D Humidity Temperature Duct Sensor Display 4-20mA

A Siemens QFM3171D Temperature-Humidity Duct Sensor is an accurate and highly reliable sensor designed for use in HVAC applications which monitor and control air quality duct. The sensor produces analog signals and can be used with a wide variety of control systems. The LCD display increases convenience and usability by making on site readings simple. Suggested for use with a wide variety of HVAC equipment including air handling units and ventilation systems the QFM3171D operates from 13.5–35 V DC.