Siemens Humidity and Temperature Sensor (QFA3171/QFA3171D)

The Siemens QFA3171 temperature and humidity sensor is for use in ventilation and air conditioning plants where high accuracy and short response times for measuring relative humidity are required. The measuring range covers the entire humidity range of 0...100 %. The instrument has a very high measuring range across the entire measuring range. The QFA3171 is also available with an LCD display (QFA3171D) to view both temperature and humidity. The sensor can also be outdoor mounted using the AQF3100 accessory. With a wide variety of possible applications and wide range of measurement of both temperature and humidity, the QFA3171 is the ideal solution for your monitoring needs.

Application :

  • Storage and production facilities in the paper, textile, pharmaceutical, food, chemical and electronics industry, etc.

  • Laboratories

  • Hospitals

  • Indoor swimming-pools

  • Computer and EDP centers

  • Greenhouses


Operating voltage DC 13.5...35 V
Measuring range, temperature 0...50 °C, -35...35 °C, -40...70 °C
Measurement range humidity 0...100 % r.h.
Measurement accuracy Humidity at 0...100 % r.h. and 23 °C: ±2 % r.h., Temperature, at 15...35 °C: ±0.6 K, Temperature, at 40...70 °C: ±0.8 K
Time constant Humidity: <20 s, Temperature: <8.5 min
Connection, electrical Screw terminals
Signal output temperature DC 4...20 mA
Signal output humidity DC 4...20 mA
Degree of protection IP65 / IP40
Dimensions (W x H x D) 80 x 144 x 39 mm

Note: For more detailed specifications, please download the additonal documents