Siemens Building Technology QFM2100 Sensor

The Siemens Building Technology QFM2100 Sensor is a professional-grade duct relative humidity sensor designed for accurate integration into commercial HVAC and ventilation systems. Engineered for high-stability monitoring, this unit provides a precise 0-10Vdc output signal corresponding to 0-100% relative humidity. It serves as an essential component for building automation systems (BAS), ensuring optimal indoor air quality and moisture control. As a technical professional, you can rely on this sensor for mission-critical applications such as economizer control, humidification management, and process monitoring in environments like data centers or hospitals.

This model is the primary direct replacement for the HT-6703-0N00P, facilitating seamless retrofits without extensive re-wiring. The device features an adjustable insertion depth ranging from 3.5 to 8 inches, allowing for flexible mounting across various duct sizes and profiles. Its robust design includes a terminal block connection for secure field wiring and an IP54-rated housing that protects the circuitry from contaminants. Operating on a multi-voltage platform (24 VAC/VDC), the QFM2100 provides consistent performance across its entire humidity measurement range without the need for frequent recalibration.

• Universal Compatibility: Seamlessly replaces legacy equipment like the HT-6703-0N00P and integrates with most 0-10V controllers.
• Variable Probe Length: Adjustable insertion depth from 3.5" to 8" accommodates multiple duct dimensions.
• High-Accuracy Monitoring: Delivers precise 5% or better accuracy for demanding humidity-sensitive applications.
• Rugged Industrial Build: All-polymer probe and IP54 enclosure withstand standard duct air velocities and commercial environmental conditions.

Common Questions

Is the QFM2100 a direct substitute for Johnson Controls humidity sensors?
Yes, the QFM2100 is the recommended industrial replacement for the HT-6703-0N00P model. It utilizes a similar 0-10Vdc signal architecture, though you should confirm power consumption and terminal assignments during installation.

Does this unit require a separate mounting flange?
The sensor typically includes a mounting flange that supports the adjustable probe depth, enabling secure fastening to the duct wall while maintaining an airtight seal.

What power source is required for the QFM2100?
The unit is compatible with standard HVAC 24 VAC or 13.5 to 35 VDC power supplies, making it versatile for both new installations and existing control loops.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.