This document is the user guide of HygroFlex HF3 transmitters and thermo-hygrostats, which introduces the function, features and usage of the products
The Rotronic HF3 series includes transmitters (HF32, HF33) and thermo-hygrostats (HF34) designed for fixed installation in cost-sensitive HVAC applications. These instruments measure temperature, relative humidity, and dew or frost point using the ROTRONIC AirChip 3000 digital technology. The series supports various output signals, including analog voltage/current and relay outputs, and features digital calibration and automatic sensor testing.
| Measured parameters | Relative humidity, Temperature, Dew or frost point |
|---|---|
| Operating temperature range | -40 to 60 C |
| Operating humidity range | 0 to 100 %RH |
| Power supply (HF32) | 10...28 VDC |
| Power supply (HF33) | 15 to 40 VDC or 12 to 28 VAC |
| Power supply (HF34) | 8 to 40 VDC or 12 to 28 VAC |
| Analog output resolution | 16-bit |
The minimum supply voltage is 20 VDC.
Yes, using the ROTRONIC HW4 software, the HF3 can be configured to calculate either the dew point or the frost point.
The HF3 is configured using the ROTRONIC HW4 software via a service connector.