The Siemens Building Technology QFM2101 is a precision duct-mount relative humidity sensor engineered for commercial and industrial HVAC building automation applications. Delivering a universal 4–20 mA analog output signal, it integrates seamlessly with building automation systems (BAS), DDC controllers, and energy management platforms that require reliable, continuous humidity monitoring within air handling ducts.
Key Features
- 4–20 mA analog output signal for direct integration with BAS and DDC controllers
- Full-range 0–100% relative humidity (RH) measurement capability
- Adjustable insertion depth probe: 3.5 to 8 inches to accommodate various duct sizes and configurations
- Terminal block connection for straightforward, tool-friendly field wiring
- No display — ideal for installations where local readout is not required, reducing cost
- Duct-mount design for accurate in-stream humidity sensing
Application
The QFM2101 is well-suited for commercial HVAC systems requiring accurate duct humidity monitoring for dehumidification control, economizer strategies, demand-controlled ventilation, and indoor air quality management. The adjustable probe length ensures compatibility with a wide range of rectangular and round duct dimensions without the need for additional adapters.
Specifications
- Output Signal: 4–20 mA
- Measurement Range: 0–100% RH
- Probe Insertion Depth: Adjustable, 3.5 – 8 inches
- Connection Type: Terminal Block
- Display: None
- Mounting: Duct-mount
- Brand: Siemens Building Technology
- SKU: QFM2101
Why Choose the Siemens QFM2101?
Siemens Building Technology is a globally recognized leader in HVAC controls and building automation. The QFM2101 reflects that heritage with robust construction, accurate sensing, and flexible installation features that save time on the job. The 4–20 mA output is immune to signal degradation over long wire runs, making it a dependable choice for large commercial buildings and industrial facilities alike.
