Ambient Air Probe for Indicators, Transmitters or Data Loggers

The HC2A-S / HC2A-S3 is the most versatile probe from ROTRONIC and forms the basis of the product portfolio. It measures humidity and temperature and calculates the dew/frost point.

HVAC, food industry, building services equipment, paper, textile and pharmaceutical industries

• Relative humidity, temperature measurement and dew point calculation
• Outstanding accuracy and repeatability
• Excellent long-term stability <1 %RH / year
• Integrated data acquisition and calibration history 
• Auto-diagnostics with error compensation
• Programmable alarm functions
• Advanced easy-to-use calibration features
• 100% field interchangeable

Probe type Standard probe
Dimensions Ø15 x 108 mm
Weight 10 g
Operating range -50…100 °C / 0…100 %rh
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
Power supply / Power consumption 3.3…5 VDC
Current consumption 4.5 mA at 3.3 VDC
Long-term stability <1 %rh / year
Humidity sensor Hygromer HT-1
Temperature sensor Pt100 Class A
Probe protection Polycarbonate plastic cage, black
Filter cartridge Polyethylene
Filter type Polyethylene, 40 μm
Response time t 63 <15 sec.
Allowed wind speed 20 m/s, with filter
Psychrometric calculations Dew or frost point
Reproducibility Airchip <0.02 %rh / 0.01 K
Exploitation software ROTRONIC HW4
Probe adjustment by software 1 Point & multipoint %rh & °C
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 x 0…1 VDC
Analogue outputs scaleable by the user Yes
Analog output signal (standard) 0…1 V = 0…100 %rh; 0…1 V = -40…60 °C
Digital output signal (standard) UART
Service Interface 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 material PEEK
Enclosure material Polycarbonate
Housing Polycarbonate
FDA/GAMP compatibility FDA 21 CFR Part 11 and GAMP compatible