Siemens QFA3171D Outdoor Humidity and Temperature Sensor – 4–20 mA Outputs, Integrated LCD Display

General
The Siemens QFA3171D is a combined relative humidity and temperature sensor designed for demanding HVAC, building automation and environmental monitoring applications. It measures relative humidity from 0 to 100% RH and temperature across selectable measuring ranges.

The sensor provides separate 4–20 mA outputs for humidity and temperature, supporting integration with building management systems (BMS) and compatible industrial controllers. An integrated LCD display allows users to view measured values locally.

Features
- Combined relative humidity and temperature measurement.
- Integrated LCD display for local readings.
- Separate 4–20 mA outputs for humidity and temperature.
- Humidity measurement range: 0–100% RH.
- Humidity accuracy: ±2% RH.
- Three selectable temperature measuring ranges.
- Pt1000 temperature sensing element.
- Suitable for demanding HVAC and building automation applications.
- IP65 housing protection and IP40 protection at the measuring tip.

Key Specifications
- Brand: Siemens
- Model: QFA3171D
- Manufacturer Part Number: BPZ:QFA3171D
- Product Type: Combined humidity and temperature sensor
- Humidity Measuring Range: 0–100% RH
- Humidity Accuracy: ±2% RH
- Humidity Output: 4–20 mA DC
- Temperature Measuring Ranges: 0–50°C (factory setting), −35 to +35°C, −40 to +70°C
- Temperature Output: 4–20 mA DC
- Temperature Sensing Element: Pt1000
- Temperature Accuracy: ±0.6 K at 15–35°C; ±0.8 K at 40–70°C
- Humidity Response Time: 20 seconds
- Temperature Response Time: 510 seconds
- Operating Voltage: 13.5–35 V DC
- Power Consumption: Maximum 1 W
- Display: Integrated LCD
- Electrical Connection: Screw terminals
- Connection Cable: 2-wire
- Housing Colour: Grey
- Protection Rating: IP65 (housing), IP40 (measuring tip)
- Dimensions (W × H × D): 80 × 144 × 39 mm
- EAN: 7612914053763