Standard Humidity and Temperature Transmitter – Rotronic HF3A
The HF3A is a robust humidity transmitter from the HygroFlex3 Advanced series, designed for HVAC and light industrial applications. It offers precise relative humidity and temperature measurement, including calculated psychrometric parameters. Configuration is fast and flexible via NFC — even when unpowered. Its versatile design allows for wall, duct, or cable probe mounting.
Key Features:
• Versatile design for HVAC and light industrial use
• High-accuracy measurement of humidity and temperature
• Calculated psychrometric parameters available
• NFC configuration – even when device is unpowered
• IP65-rated, durable housing
• Versions for wall, duct, or cable mounting
• Display with trend indicator, LED status, and optional backlight
Technical Specifications
| Specification | Details |
| Sensors | Humidity: ROTRONIC Hygromer® HT-1 Temperature: Pt100 1/3 Class B |
| Accuracy | ±1.2 % rh and ±0.1 °C at 23 °C |
| Measurement Range | Humidity: 0–100 % rh Temperature: –50 … +100 °C (depending on version) |
| Initialization Time | ~5 seconds |
| Sampling Interval | 1 second |
| Analog Outputs | 4–20 mA, freely scalable (e.g., 0–10 V, 0–1 V, 0–20 mA) |
| Analog Output Resolution | >15 bits |
| Digital Output | RS-485 (HF3A-D version) |
| Power Supply | HF3A-2: 10–28 VDC HF3A-3/D: 18–36 VDC |
| Current Consumption | HF3A-2: 2 × 23 mA Others: < 50 mA |
| Connectors | 1 × M12 (2 × M12 for HF3A-D) |
| Interfaces | UART, NFC, USB (compatible with HygroSoft software) |
| Housing Material | PC-ABS, lead-free, RoHS-compliant |
| Dimensions | Wall: 122 × 172 × 40.5 mm Duct: 122 × 82 × 265.5 mm Cable: Probe 144 × 15 mm |
| Weight | Wall: 204 g Duct: 226 g Cable: 332 g |
| IP Protection | IP65 |
| Certifications | CE 2014/30/EU, GAMP5 compliant |
| Optional Accessories | NFC-USB Reader, HygroSoft PC software |
