Rotronic Instrument Corp.

- Model HF3 - HVAC Transmitter

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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 to 100 %RH
  • Range of application electronics: -40 to 60  °C / 0 to 100 %RH, -10 to 60  °C with LCD
  • Use as simulator for system validation*
  • Service interface
  • Adjusted at 23  °C and 10, 35, 80 %RH

  • PROBE TYPE: Integrated
  • OPERATING RANGE: -40…60 °C / -10…60 °C (Models with display) 0…100 %rh, non-condensing
  • ACCURACY AT 23 ±5 °C: ±2.0 %rh / ±1.0 %rh (Type R), ±0.3 K / ±0.2 K (Type R)
  • MEASURING RANGE WITH INTEGRATED PROBE: -40…60 °C / 0…100 %rh
  • POWER SUPPLY / POWER CONSUMPTION: 15…40 VDC or 12…28 VAC/ <100 mA
  • PROBE PROTECTION: Polycarbonate plastic cage, white
  • FILTER CARTRIDGE: Polyethylene dust filter, gray, 20 um
  • RESPONSE TIME T 63: <12 s for 63% of a 35> 80% (1 m / sec air flow at the sensor)
  • ALLOWED WIND SPEED: 20 m/s, with filter
  • PSYCHROMETRIC CALCULATIONS: Dew or frost point
  • REPRODUCIBILITY AIRCHIP: <0.02 %rh / 0.01 K
  • MEASUREMENT INTERVAL: typically 1 second (without calculations)
  • DISPLAY TYPE: Optional graphics display. Presentation configurable.
  • BACKLIGHT: with Backlight
  • ALARM INDICATORS: Yes
  • EXPLOITATION SOFTWARE: ROTRONIC HW4
  • TREND INDICATOR: Yes, for models with display
  • PROBE ADJUSTMENT BY SOFTWARE: Yes, with service cable
  • REMOTE CONTROL FUNCTIONS: Via HygroPalm and service cable
  • FIRMWARE UPDATE: With internet and HW4 software
  • USER INFORMATION: from Software HW4 (devicemanager)
  • DATA PROCESSING VIA HW4: with interface cables
  • DEVICE PROTECTION BY PASSWORD: Yes
  • TYPE OF OUTPUT SIGNALS: 2
  • ANALOGUE OUTPUTS SCALEABLE BY THE USER: Yes
  • CHANGE OF OUTPUT SIGNAL W/O ADJUSTMENT: Yes
  • ANALOG OUTPUT SIGNAL (STANDARD): 0…20 mA, 4… 20 mA; 0… 1 V, 0… 5 V, 0… 10 V
  • DIGITAL OUTPUT SIGNAL (STANDARD): UART
  • MIN. / MAX. LOAD VOLTAGE / CURRENT SIGNAL: V min = 10 V + (0.02 x Load*) * = Resistance in ohms
  • SERVICE INTERFACE: Mini USB (UART)
  • SERVICE INFORMATION: Calibration interval
  • MAX. CABLE LENGTH: Up to 5 m with passive cable. Up to 100 m with active cable.
  • PROBE MATERIAL: Polycarbonate
  • ENCLOSURE MATERIAL: ABS
  • IP PROTECTION RATING: HF3x-S/ HF3x-R: IP2, HF3x-W/ HF3x-D: IP65
  • FIRE PROTECTION CLASS: Complies UL94-HB
  • FDA/GAMP COMPATIBILITY: FDA 21 CFR Part 11 and GAMP compatible
  • 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

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