Rotronic Hygroflex HF4 Transmitter

In stock


Rotronic Hygroflex HF4 Transmitter is designed to measure Temperature, Relative Humidity, and Dew Point calculation and displayed on the LCD screen. This Hygroflex4 Transmitter has a Temperature measuring range of up to 100 °C and Relative Humidity range of up to 100 % RH. This device is user friendly and can be Wall or Duct mounting.  
Applications: museums, greenhouses, warehouses, libraries, railway stations, indoor environments

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Rotronic Hygroflex HF4 Transmitter is used to measure Temperature, Relative Humidity, and Dew Point calculation. This Transmitter has a graphic LCD with a backlight. This Hygroflex4 device has internal memory and data that save up to 2000 points for data logging functions. This Rotronic Hygroflex device has a protection class of IP65. 
Features of Rotronic Transmitter:

  • This HF4 Transmitter compensates for Temperature and Humidity over 30,000 reference points 
  • It has 2,000 data point memory 
  • Dew/ frost point calculation 
  • Sensor auto-diagnostics and automatic correction 
  • This Rotronic Hygroflex4 Transmitter helps users to Activate alarm and information 
  • Application Specific Integrated Circuit, micro-controller, and EEPROM on one chip 

Additional information



Model No

HF 420

Measuring Parameters

Temperature And Humidity

Temperature Range

-50 to 100 °C

Temperature Accuracy

±5 °C

Temperature Sensor

Pt100 1/3 Class B

Humidity Range

10 to 100% RH

Humidity Accuracy

±1.0 %RH

Response Time

10 sec

Sensor protection

Polyethylene filter

Long-term stability

<1 % RH /yr

Cable Connection

1 x M16 x 1.5, on terminals

Power Supply

20 to 28 VDC

Power Consumption

HF42: max 40 mA

IP Rating


Housing Material



Backlit graphic LCD


220 Grams

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Rotronic Hygroflex4 Transmitter

Rotronic Hygroflex HF4 Transmitter