This document is a user guide for HygroFlex HF3 transmitters and thermo-hygrostats from Rotronic AG. The document provides information on the models, mechanical configurations and dimensions, display options, power supply, measured parameters, calculated parameters, analog output signals, relay outputs, service connector, sensor protection, and more.
The HygroFlex HF3 series includes transmitters (HF32, HF33) and thermo-hygrostats (HF34) designed for fixed installation in HVAC applications. These devices measure temperature, relative humidity, and dew or frost point using ROTRONIC Hygromer® IN1 capacitive sensors and Pt100 RTDs. The series supports various output signals, including 4…20 mA, 0…10 V, and relay contacts, with options for duct, wall, or space mounting.
| Measured parameters | Temperature, relative humidity, dew or frost point |
|---|---|
| Operating temperature range | -40 to 60 °C |
| Operating humidity range | 0 to 100 %RH |
| Sensor type for humidity | ROTRONIC Hygromer® IN1 capacitive sensor |
| Sensor type for temperature | Pt100 RTD |
| Power supply (HF32) | 10…28 VDC |
| Power supply (HF34) | 8 to 40 VDC or 12 to 28 VAC |
The HF3 series is designed for conditions within the range of -40 to 60 °C.
Humidity is measured with a ROTRONIC Hygromer® IN1 capacitive sensor, and temperature with a Pt100 RTD.