Rotronic HF1 Basic Humidity and Temperature Transmitter
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.
KEY FEATURES
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)
TECHNICAL SPECIFICATIONS
Measurement Specifications
| 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 |
Electrical Specifications
| 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) |
Mechanical & IP Ratings
| 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
APPLICATIONS
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
WHAT’S IN THE BOX
HygroFlex1 HF1 (Wall / Duct / Space version)
Mounting screws
User sheet & wiring guide
FAQS
Q1. What is the accuracy difference between versions?
Wall & Duct: <±2% RH
Space: <±3% RH
Q2. Are the outputs scalable?
Yes—both outputs (RH + Temperature) can be scaled using Rotronic SW21.
Q3. Is the Space version IP65?
No—the space version is IP30 (indoor use only).
Wall & Duct are IP65.
Q4. What probe length is available for the duct version?
100 mm (Type D) is standard.
300 mm (Type F) is also available but not included in this listing.
Q5. Which output types are available?
4–20 mA (2-wire or 3-wire)
0–10 V (duct HF135)