HygroFlex8 - HF8 - transmitter

HygroFlex8 - HF8 - 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

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

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