Rotronic HygroFlex1 HF1 Series – Wall, Duct & Space Mount Humidity & Temperature Transmitters
HVAC-grade humidity & temperature transmitters with Hygromer® IN-1 sensor, ±2% accuracy (Wall & Duct), IP65 housing (W/D), and 4–20 mA / 0–10 V outputs for BMS and industrial HVAC applications.
The Rotronic HygroFlex1 (HF1 Series) is a cost-effective HVAC transmitter range designed for reliable humidity and temperature monitoring in buildings, air handling units, duct systems, cleanrooms, and climate-critical environments. Using the Hygromer® IN-1 sensor, the HF1 family provides high accuracy, fast response, and solid long-term stability.
Rotronic Hygromer® IN-1 humidity sensor
Accuracy:
Wall (W): <±2% RH (10…90% RH)
Duct (D): <±2% RH (10…90% RH)
Space (S): <±3% RH (10…90% RH)
Adjustable at 35% RH & 80% RH
Temperature range:
W, D: –20…60 °C
S: –20…50 °C
Two scalable analog outputs (humidity and temperature)
4…20 mA (HF120 / HF132 variants)
0…10 V (HF135 duct model)
Long-term stability: <1.5% RH/year
IP ratings:
Wall (W): IP65
Duct (D): IP65
Space (S): IP30
Fast RH response time (t63): 30 s
CE/EMC compliant (2004/108/EC)
| Parameter | Wall (W) | Duct (D – 100 mm) | Space (S) |
|---|---|---|---|
| RH Range | 0–100% RH | 0–100% RH | 0–100% RH |
| RH Accuracy | <±2% RH (10–90%) | <±2% RH (10–90%) | <±3% RH (10–90%) |
| Temp Range | –20…60°C | –20…60°C | –20…50°C |
| Temp Accuracy | ±0.3°C | ±0.3°C | ±1°C |
| Response Time | 30 s | 30 s | 30 s |
| Sensor | Hygromer® IN-1 | Hygromer® IN-1 | Hygromer® IN-1 |
| Parameter | Specification |
|---|---|
| Supply Voltage | 12–28 VAC / 15–40 VDC |
| Current Consumption | 2-wire <40 mA; 3-wire <15 mA (voltage), <55 mA (current output) |
| Outputs | 4–20 mA (2-wire or 3-wire) / 0–10 VDC (duct HF135) |
| No. of Outputs | 2 analog outputs (scalable) |
| Version | Dimensions (mm) | Weight | IP Rating |
|---|---|---|---|
| Wall (W) | 105 × 70 × 32 | 140 g | IP65 |
| Duct (D) 100 mm | 105 × 70 × 32 + 100 mm probe | 140 g | IP65 |
| Space (S) | 86 × 86 × 24 | 90 g | IP30 |
Probe diameter for Duct: Ø15 mm
HVAC & BMS systems
Ventilation ducts
Air handling units (AHUs)
Cleanrooms & labs
Office & commercial spaces (Space version)
Energy-efficient building automation
Fan-coil units & VAV systems
HygroFlex1 HF1 (Wall / Duct / Space version)
Mounting screws
User sheet & wiring guide
Wall & Duct: <±2% RH
Space: <±3% RH
Yes—both outputs (RH + Temperature) can be scaled using Rotronic SW21.
No—the space version is IP30 (indoor use only).
Wall & Duct are IP65.
100 mm (Type D) is standard.
300 mm (Type F) is also available but not included in this listing.
4–20 mA (2-wire or 3-wire)
0–10 V (duct HF135)
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