Starting at $510.00

Some models in stock. View available part numbers.

Need Help? Call a Calibration Engineer 1-800-884-4967

We're open Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET


  • 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 and temperature. Based on AirChip3000 technology, the Rotronic HygroFlex3-Series achieve a degree of accuracy not seen before.

AirChip3000 Technology

AirChip3000 technology compensates humidity and temperature over 30,000 reference points, has a 2000 data point memory, and 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 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)
Part Number Price Available
Show Configuration
Base Price
Input Voltage & Output
18 to 40VDC (13 to 28VAC) input, 3-wire, 4 to 20mA output
Installation Type
Space mount with fixed probe
Humidity and temperature
Temperature Output
0 to 100°F
LCD display (HF32: no backlight, HF33: backlight) (+$190.00)
$700.00 1

Interested in Other Part Numbers?

Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 2-3 weeks". Click here to select options