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Siemens® QFM2171 Duct Sensor

KSh 25225

In stock

Siemens® QFM2171 Duct Sensor transmits changes in humidity and temperature to the building control systems. These sensors are mainly suitable for applications where precise, stable humidity sensing is required.

Applications: Air Ducts, HVAC Systems, etc

Siemens® QFM2171 Duct Sensors are for use in air ducts of ventilation and air conditioning plants for acquiring

  • Relative Humidity
  • Temperature

The sensors are used as:

  • Control sensors in the supply or extract air
  • Reference sensors, e.g. for shifting the dew point
  • Limit sensors, e.g. in connection with steam humidifiers

Additional information



Model No


Measuring Parameters

Temperature and Relative Humidity

Temperature Range

-35 to +35 °C, -40 to +70 °C, 0 to 50℃

Temperature Accuracy

±0.3 °K

Humidity Range

0 to 100% RH

Humidity Accuracy

±3% RH


DC 13.5…35 V

Response Time

Humidity: 20 s, Temperature: 20 s

Immersion Length

90…154 mm

Connection Type

Screw terminals

Protection Class

IP 54


DC 0…10 V, DC 4…20 mA

Signal Output Temperature

DC 4 to 20 mA

Signal Output Humidity

DC 4 to 20 mA


80 X 88 X 39mm


590 Grams

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Siemens® QFM2171 Duct Sensor

KSh 25225

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