Description
The Siemens QFM4171 is a professional-grade duct-mount relative humidity and temperature sensor engineered for building automation and HVAC control applications. Delivering accurate, continuous monitoring via a 4-20mA analog output signal, this sensor integrates seamlessly with building management systems (BMS), DDC controllers, and energy management platforms.
Key Features
- Dual-parameter measurement: Relative Humidity (0–100% RH) and Temperature, both transmitted via 4-20mA output signals
- Adjustable insertion depth probe ranging from 3.5 to 8 inches, accommodating a wide range of duct sizes and configurations
- Terminal block connection for fast, secure, and reliable field wiring
- No display model — ideal for installations where a local readout is not required, reducing cost and complexity
- Designed for duct-mount installation in air handling units, VAV systems, and commercial HVAC ductwork
- Manufactured by Siemens Building Technology, a globally recognized leader in building controls and automation
Output & Signal
- Humidity Output: 4-20mA, scaled to 0–100% RH
- Temperature Output: 4-20mA analog signal
- Connection Type: Terminal Block
Mechanical Specifications
- Probe Length: Adjustable, 3.5 to 8 inches insertion depth
- Mounting: Duct-mount with adjustable probe for versatile installation
- Display: None
Applications
- Commercial and industrial HVAC duct humidity and temperature monitoring
- Building automation system (BAS/BMS) integration
- Air handling units (AHUs) and variable air volume (VAV) systems
- Demand-controlled ventilation and energy management strategies
- Dehumidification control and indoor air quality monitoring
The Siemens QFM4171 offers the reliability and precision that HVAC professionals demand in commercial environments. Its adjustable probe length and standard terminal block wiring make installation straightforward across a variety of duct dimensions, while the 4-20mA output ensures compatibility with virtually any modern building controls platform.
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