Product Description
Siemens QFM81.2 Humidity Sensor
The Siemens QFM81.2 is a high-precision duct sensor designed for measuring relative humidity in ventilation and air conditioning (HVAC) systems. It is engineered for reliable and accurate air quality control, providing a DC 0…10V output signal corresponding to the measured humidity. Its robust construction and capacitive sensing element ensure long-term stability and performance, making it an ideal choice for controlling and monitoring humidity levels within air ducts to maintain optimal comfort and energy efficiency in commercial and industrial buildings.
Technical Specifications:
- Operating voltage: AC 24 V or DC 13.5…35 V
- Humidity measuring range: 0…95 % r.h. (non-condensing)
- Output signal humidity: DC 0…10 V
- Sensing element: Capacitive
- Measurement accuracy: At 23 °C, ±5 % r.h. (30…70 % r.h.)
- Degree of protection: IP54

Siemens QFM81.2 Humidity Sensor
Siemens QFM81.2 duct sensor for reliable relative humidity measurement in HVAC systems. Features a 0-10V output signal and high accuracy for efficient air quality control.







