Description
The Siemens QFA3171 is a precision room relative humidity sensor engineered for building automation and HVAC control applications. Designed to deliver accurate, continuous monitoring of indoor humidity conditions, this sensor outputs a standard 4-20mA signal across the full 0–100% relative humidity (RH) range, making it fully compatible with a wide variety of building automation systems (BAS), DDC controllers, and data acquisition equipment.
With its terminal block connection type, the QFA3171 offers straightforward field wiring without the need for specialized connectors, simplifying installation and reducing commissioning time. The absence of a local display keeps the unit compact and cost-effective for applications where readings are monitored remotely through a central control system.
Key Features
- Measures relative humidity from 0% to 100% RH
- 4-20mA analog output signal for reliable long-distance signal transmission
- Terminal block connection for easy and secure field wiring
- No local display — ideal for centrally monitored BAS installations
- Compact room-mount form factor
- Siemens Building Technology quality and reliability
Applications
- Commercial HVAC humidity monitoring and control
- Building automation systems (BAS/DDC)
- Indoor air quality (IAQ) management
- Ventilation and dehumidification control
- Data centers, offices, and institutional facilities
Specifications
- SKU: QFA3171
- Brand: Siemens Building Technology
- Measurement Range: 0–100% Relative Humidity (RH)
- Output Signal: 4-20mA
- Connection Type: Terminal Block
- Display: None
- Mount Type: Room
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