Rotronic HF4 High Accuracy HVAC Transmitters for Relative Humidity, Dewpoint, and Temperature

The Rotronic HF4 is a fixed installation humidity transmitter used in HVAC and light industrial applications. This transmitter can measure temperature and humidity, and can calculate dew/frost point, within range of 0 to 100 %RH and -58° to 212°F (-50° to 100°C).

There are two different versions of these transmitter: the duct version, and the wall version. Both of these transmitters have a 2 or 2 x 2-wire or 3/4 wire session power option.

This HF4 transmitter can be set to multiple settings and functions and can be configured with the ROTRONIC HW4 software.

Key Specifications

  • Measures relative humidity and temperature, humidity only, or temperature only
  • Calculates the dew or frost point
  • Accuracy: ± 1.0 %RH and ± 0.2 K at 23°C
  • Range of application electronics: -40° to 140°F (-40° to 60°C)/ 0 to 100 %RH; 14° to 140°F (-10° to 60°C) with LCD
  • Configurable analog output signals (signal type, parameter and range)
  • Optional LCD display and keypad
  • Configurable fail safe mode

Specifications, Manuals, and Supporting Literature

Click the file icon to view the file online, or right-click on the file icon and select "Save Target As..." to download the file to your computer for later viewing.
Tip: If you want to print a large file, download it to your PC first.


Subscribe to the Lesman Instrument Company YouTube channel.Lesman Instrument Company on YouTube

Video is a great way to learn about instruments and technology, and it's available whenever you need it. Watch step-by-step instructions on how to configure a transmitter, tune a controller, or troubleshoot a safety valve. We'll post videos we create, and those our manufacturer partners share with us, so you don't have to look in multiple places to find the video training you need.

Subscribe to Lesman's YouTube channel, and you'll get email notifications as soon as we add new training videos and webinars.