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Rotronic HygroFlex HF-8 Transmitter


The HF8 is a multi-function transmitter designed to meet the requirements of applications requiring multiple instruments with one self contained instrument. The HF8 has an extensive set of optional functions and settings that can be configured and enabled with the ROTRONIC HW4 software after connecting the HF8 to a PC.


Measures relative humidity, temperature and all calculated (psychrometric) parameters in the fields of HVAC, industry and pharmaceuticals.


  • 2 interchangeable HC2 or analog probes
  • Range of application electronics: -40…60 °C / 0…100 %rh; -10…60 °C with LCD
  • Digital outputs, also combinable with analog outputs
  • Analog inputs (U/I)
  • Data logging, up to 10‘000 measured values
  • Relay outputs
  • Use as simulator for system validation *
  • Service interface


Dimensions 192 x 102 x 52 mm
Operating range -40…85 °C / -10…60 °C (Models with display) 0…100 %rh, non-condensing
Accuracy at 23 ±5 °C ±0.8 %rh / ±0.1 K
Measuring range with interchangeable probe 0…100 %rh and -100…200 °C
Power supply / Power consumption 15 ... 40 VDC or 12 ... 28 VAC, 50-60 Hz
9 ... 36 VDC, with galvanic isolation
85 ... 265 VAC, 5 watts, 50-60 Hz with electrical isolation
Psychrometric calculations All psychrometric values
Number of probe inputs 2
3rd party analogue probe input 2
Calibration / adjustment with Software HW4
Initialisation time Typically 1.9 sec.
Measurement interval 1 s (typical)
Engineering units displayed 1 or 2 decimal places
Display type Optional graphics display. Presentation configurable.
Backlight with Backlight
Keypad (with display only) Yes
Alerting Yes
Alarm indicators Yes
Acoustical alarm (Beeper) Yes
Real time clock w.backup battery Yes
Memory size 10,000 pairs of readings (relative humidity and temperature) with HC2; 10,000 readings with 1-channel sensor
Exploitation software ROTRONIC HW4
Trend indicator Yes, for models with display
Probe adjustment by software Yes, with service cable
Probe adjustment by keypad display / keyboard
Firmware update With internet and HW4 software
Data processing via HW4 with interface cables
Circuit type 3/4 wire
Analogue outputs scaleable by the user Yes
Analog output signal (standard) 0…1 V, 0…5 V, 0…10 V, 0(4)…20 mA
Relay type and number SPDT (single pole changeover); Max Switching voltage: 250 VAC*; Max Switching Current: 6A (*resistive load)
Configurable relay outputs 4
Communication interfaces RS-485 / USB / LAN
Service Interface Mini USB (UART)
Reverse voltage protection Protection diode to V +
Max. nr. of devices in RS485 network 64
Max. cable length Up to 5 m with passive cable. Up to 100 m with active cable.
Max. probe cable length 10 m
Probe material Dependent on probe
Enclosure material ABS
Cable connections 1x M16x1.5 or ½ "conduit adapter
IP protection rating IP65 (except models with USB / Ethernet interface)
Fire protection class Complies UL94-HB
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible
Weight 540.0000





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