Humidity and Temperature Transmitters

HygroFlex3 - HF3 - HVAC transmitter

R-Type / S-Type
Measures relative humidity and temperature and calculates the dew/frost point in offices and rooms where good looks play a role.

W-Type / D-Type
Measures relative humidity and temperature and calculates the dew/frost point in HVAC applications focused on relability and repeatability.


• Accuracy: ±2 %rh / ±0.3 K at 23°C ±5 K
• Temperature limit at probe: -40…60 °C / 0…100 %rh
• Range of application electronics: -40…60 °C / 0…100 %rh, -10…60 °C with LCD
• Service interface
• Adjusted at 23 °C and 10, 35, 80 %rh

More Information
Probe type Integrated
Accuracy at 23 ±5 °C ±2.0 %rh / ±1.0 %rh (Type R), ±0.3 K / ±0.2 K (Type R)
Reproducibility Airchip <0.02 %rh / 0.01 K
Response time t 63 <12 s for 63% of a 35> 80% (1 m / sec air flow at the sensor)
Power consumption 15…40 VDC or 12…28 VAC/ <100 mA
Dimensions Wall: ø 82 x 43, probe length 100 mm Duct: ø 82 x 43, probe length 207 mm Room: 82 x 82 x 26 mm
Operating range -40…60 °C / -10…60 °C (Models with display) 0…100 %rh, non-condensing
Allowed wind speed 20 m/s, with filter
Display type Optional graphics display. Presentation configurable.
Backlight with Backlight
Alarm indicators Yes
Exploitation software ROTRONIC HW4
Trend indicator Yes, for models with display
Psychrometric calculations Dew or frost point
Analogue outputs scaleable by the user Yes
Remote control functions Via HygroPalm and service cable
Software Update With internet and HW4 software
User information from Software HW4 (devicemanager)
Data processing via HW4 with interface cables
Type of output signals 2
Digital output signal (standard) UART
Service Interface Mini USB (UART)
IP protection rating HF3x-S/ HF3x-R: IP20
HF3x-W/ HF3x-D: IP65
Fire protection class Complies UL94-HB
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible
Change of output signal w/o adjustment Yes
Measuring range with integrated probe -40…60 °C / 0…100 %rh
Measurement interval typically 1 second (without calculations)
Probe adjustment by software Yes, with service cable
Device Protection by password Yes
Analog output signal (standard) 0…20 mA, 4… 20 mA; 0… 1 V, 0… 5 V, 0… 10 V
Min. / max. load voltage / current signal V min = 10 V + (0.02 x Load*) * = Resistance in ohms
Service Information Calibration interval
Max. cable length Up to 5 m with passive cable. Up to 100 m with active cable.
Probe material Polycarbonate
Probe protection Polycarbonate plastic cage, white
Filter cartridge Polyethylene dust filter, gray, 20 um
Enclosure material ABS

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