Rotronic HF34 Series Thermo-Hygrostat

DISCONTINUED ITEM-Replacement Models Available: Humidity Transmitters

The HF34 thermo-hygrostat is designed for applications where conditions are within the range of 0 to 100 %RH and -40 to 60°C (-40 to 140°F). Depending on the model, the HF34 has one or two relays corresponding to relative humidity, temperature or to the dew or frost point. The HF34 is well suited for simple tasks such as alarming, the switching of dryers, humidifiers, etc. The key features of the HF34 will satisfy application requirements ranging from the most basic to demanding.

The HF34 is available in different configurations - see ordering codes - and has an extensive set of settings and functions that can be configured and enabled by the user with the ROTRONIC HW4 software.

In spite of its sophistication, the HF34 can still be used just as a simple conventional humidity and temperature thermo-hygrostat.

Note: When ordering, be sure to clearly specify the adjustment span of each set point potentiometer. To facilitate a precise adjustment of the set point , it is highly recommended to specify a narrow span for the potentiometer.Note: When ordering, be sure to clearly specify the adjustment span of each set point potentiometer. To facilitate a precise adjustment of the set point , it is highly recommended to specify a narrow span for the potentiometer.

• Measures relative humidity and temperature, or humidity only, or temperature only
• Calculates the dew or frost point
• Integral probe – cannot be separated from transmitter. Duct (through-wall probe) or wall mount configurations
• Configurable: parameter corresponding to relay, adjustment range of the set point potentiometer and dead band
• Automatic RH sensor test with optional sensor drift correction
• Configurable fail safe mode: fixed humidity and temperature signals in the event of a humidity or temperature sensor failure
• Internal service connector for full access to the HF34 settings and functionsNote: When ordering, be sure to clearly specify the adjustment span of each set point potentiometer. To facilitate a precise adjustment of the set point , it is highly recommended to specify a narrow span for the potentiometer.

The HygroFlex3-series is ideal for all applications where exact measurement of humidity and temperature is of decisive importance. The transmitters can be used in a variety of fields for heating, ventilation and air conditioning applications, greenhouses, museums, warehouses, libraries, railway stations and for climate control in office buildings. Thanks to the exceptional long-term stability of the sensors and auto-diagnostics, the transmitters are both service-friendly and reliable and will save you time and money.

• Operating Limits: 0…100%RH and -40…60°C / -40…140°F
• Accuracy at 23 °C: ± 2.0 %RH and ± 0.3 °C
• Supply Voltage: 8 to 40 VDC / 12 to 28 VACNote: When ordering, be sure to clearly specify the adjustment span of each set point potentiometer. To facilitate a precise adjustment of the set point , it is highly recommended to specify a narrow span for the potentiometer.

• Rotronic HF3 Data Sheet.pdf
• Rotronic HF3 Manual.pdf