Measuring instruments and accessories for meteorology

HC2A-S3 - Standard meteo probe

The HC2A-S3 probe is the meteorological probe with a white housing - same specification overall as the HC2A-S probe but with a different filter (larger pore size suitable for meteorological applications). It measures relative humidity and temperature and calculates the dew/frost point.

Features of the meteorological probe

  • Accuracy: ±0.8 %rh, ±0.1 K, at 23 °C (10...30 °C)
  • Range of application: -50…100 °C / 0…100 %rh
  • Digital interface (UART) and scalable analog outputs, 0…1 V
  • Standard output scaling: 0…1 V = -40…60 °C / 0…100 %rh
  • Adjusted at 23 °C and 10, 35, 80 %rh


  • Measures relative humidity and temperature
  • Outstanding accuracy, repeatability and long-term stability
  • Advanced probe housing and construction
  • Available with interchangeable sensor
  • Hot swappable, no calibration adjustment required due to the digital interface with Rotronic devices

Smart Electronic

  • Based on the Rotronic’s AirChip3000
  • Calculates the dew / frost point
  • Alarm generation
  • Saves adjustment data so that probes can be
  • interchanged without re-adjusting
  • Hot-swappable

Flexibility and Compatibility

  • User scalable analog analog ouput signals (2x 0…1V)1
  • Digital interface via UART2
  • Rapidly interfaced with HygroClip2 devices from
  • Rotronic or in OEM3 applications
More Information
Probe type Meteorological probe
Humidity sensor Hygromer HT-1
Temperature sensor PT100 1/3 DIN Class B
Long-term stability <1 %rh / year
Accuracy w. adjustment profile "standard" ±0.8 %RH / ±0.1 K, at 10...30 °C
Adjustment at 23 °C and 10, 35, 80 %RH
Accuracy w. adjustment profile "High Precision" ±0.5 %RH / ±0.1 K, at 10...30 °C
at 23 °C and 10, 20, 30, 40, 50, 60, 70, 80, 90 %RH
Reproducibility Airchip <0.02 %rh / 0.01 K
Response time t 63 <15 sec.
Power consumption 3.3...5 VDC, Calibration @ 3.3 VDC / ~4.5 mA
Dimensions Ø15 x 108 mm
Operating range -50…80 °C / 0…100 %rh
Allowed wind speed 20 m/s, with filter
Exploitation software ROTRONIC HW4
Psychrometric calculations Dew or frost point
Analogue outputs scaleable by the user Yes
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 x 0…1 VDC
Digital output signal (standard) UART
Service Interface UART
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible
Probe adjustment by software 1 Point & multipoint %rh & °C
Device Protection by password Yes
Analog output signal (standard) 0…1 V = 0…100 %rh; 0…1 V = -40…60 °C
Communication interfaces UART
Reverse voltage protection Mechanically in the connector
Max. cable length Up to 5 m with passive cable. Up to 100 m with active cable.
Probe protection Polycarbonate plastic cage, white
Filter cartridge Polyethylene dust filter, white, 40 um
Enclosure material Polycarbonate
Weight 17 g
Filter type Polyethylene, 40 μm

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