Starting at $365.00

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  • Integrated sensors
  • ROTRONIC Hygromer IN-1 humidity sensor
  • Pt100 1/3 Class B temperature sensor
  • ±2.0 %rh / 0.3 K accuracy
  • < 0.02 %rh / 0.01 K resolution AirChip3000
  • Less than 10 sec response time τ 63

The new Rotronic HygroFlex3-Series Humidity Transmitter is the latest development in HVAC transmitters for relative humidity, temperature and dew point. Based on AirChip3000 technology, the Rotronic HygroFlex3-Series achieve a degree of accuracy not seen before.

In combination with advances in sensor technology and integration, the Rotronic HygroFlex3-series provides superb precision and state-of-the-art functionality, taking humidity, temperature and dew point measurements to a whole new level of performance and reliability (less than 2 %rh / 0.3 K).

The Rotronic HygroFlex3-series is highly flexible with two freely selectable and scalable analog outputs. The analog outputs are assignable to relative humidity, temperature or dew point with 2-wire or 3/4-wire systems. Two integrated relay contacts are available to convert the transmitter to a thermostat / hygrostat. Thanks to the high long-term stability of the sensors and auto- diagnostics, the transmitters are both service-friendly and reliable and will save you time and money.

AirChip3000 Technology

AirChip3000 technology compensates humidity and temperature over 30,000 reference points, has a 2000 data point memory, calculates dew/frost point, has sensor auto-diagnostics and automatic correction. AirChip3000 also includes active alarming and information, as well as ASIC (Application Specific Integrated Circuit); micro-controller and EEPROM on one chip.

Rotronic HygroFlex3-series Outputs

The highly flexible HygroFlex3-series allows the user to freely select the analog outputs by entering the type of output signal and scale. Switch actuation points for relative humidity and temperature are easily set using a potentiometer for the relay outputs option.

Rotronic HygroFlex3-series Applications

The HygroFlex3-series transmitter is ideal for all applications where exact humidity and temperature measurement is critical. The transmitters can be used in a variety of fields including:

  • Heating, ventilation, air conditioning
  • Greenhouses
  • Museums
  • Warehouses
  • Libraries
  • Railway stations
  • Climate control in office buildings


Rotronic Calibration Devices
Various calibration devices for Rotronic probes


Please consider these optional accessories.

Rotronic Probe Filters
Filters for Rotronic humidity probes
Rotronic Service Cables
Service cables for connecting Rotronic HF3 transmitters to a PC
In Stock
Rotronic Mounting Flange
Mounting Flange for Duct Mount Transmitters (max 100°C)