HF8 Multi-function transmitter

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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.


  • 2 interchangeable HC2 or analog probes
  • Limits of instrument electronics: -40..85 °C / 0â¦100 %RH; -10â¦60 °C with LCD
  • Digital outputs can be combined 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
Dimensions192 x 102 x 52 mm
Operating range electronics-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 probe0…100 %rh and -100…200 °C
Power supply / Power consumption15 ... 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 calculationsAll psychrometric values
Number of probe inputs2
3rd party analogue probe input2
Calibration / adjustmentwith Software HW4
Initialisation timeTypically 1.9 sec.
Measurement interval1 s (typical)
Engineering units displayed1 or 2 decimal places
Display typeOptional graphics display. Presentation configurable.
Backlightwith Backlight
Keypad (with display only)Yes
Alarm indicatorsYes
Acoustical alarm (Beeper)Yes
Real time clock w.backup batteryYes
Memory size10,000 pairs of readings (relative humidity and temperature) with HC2; 10,000 readings with 1-channel sensor
Exploitation softwareROTRONIC HW4.2
Trend indicatorYes, for models with display
Probe adjustment by softwareYes, with service cable
Probe adjustment by keypaddisplay / keyboard
Firmware updateWith internet and HW4 software
Data processing via HW4with interface cables
Circuit type3/4 wire
Analogue outputs scaleable by the userYes
Analog output signal (standard)0…1 V, 0…5 V, 0…10 V, 0(4)…20 mA
Relay type and numberSPDT (single pole changeover); Max Switching voltage: 250 VAC*; Max Switching Current: 6A (*resistive load)
Configurable relay outputs4
Communication interfacesRS-458 / USB / LAN / WLAN / PoE (Modus B)
Service InterfaceMini USB (UART)
Reverse voltage protectionProtection diode to V +
Max. nr. of devices in RS485 network64
Max. cable length service cable5 m
Max. probe cable length10 m
Probe materialDependent on probe
Enclosure materialABS
Cable connections1x M16x1.5 or ½ "conduit adapter
IP protection ratingIP65 (except models with USB / Ethernet interface)
Fire protection classComplies UL94-HB
FDA/GAMP compatibilityFDA 21 CFR Part 11 and GAMP compatible

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“Industrial Technical Services is a single source Instrumentation and Automation company. We provide certified calibrations, PLC programming, custom controls and Panels”.


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