INFWIN DigiGas-VOC TVOC eCO2 and Air Quality Index Sensor
The INFWIN DigiGas-VOC is a multi-gas sensor with SDI-12 or RS485/Modbus-RTU output, built around an ENS161 metal-oxide (MOX) sensing element. It detects a wide range of volatile organic compounds (VOCs) - including ethanol, toluene, hydrogen, and oxidizing gases - and runs onboard algorithms to calculate equivalent TVOC (eTVOC), equivalent CO2 (eCO2), and two air quality indices. Power supply, output interface, connector type, and cable length are configurable via ordering code - the default variant (DigiGas-VOC-AAAB002) ships with default range/accuracy, RS485/Modbus-RTU output, 5–28V DC supply, a cold-pressed terminal connector, and a 2 m cable. Alongside gas readings, the sensor reports air temperature, humidity, and dew point, with automatic temperature and humidity compensation applied to the gas outputs. Reverse power protection and built-in TVS/ESD protection are included. Key Features Integrated ENS161 multi-gas sensor: Metal-oxide (MOX) sensing for a broad range of VOCs Multiple calculated outputs: eTVOC, eCO2, AQI-U (German UBA indoor air quality index), and AQI-S (relative air quality index) Temperature and humidity compensated: Calibrated gas outputs account for ambient conditions Integrated temperature, humidity, and dew point measurement Digital output: SDI-12 (V1.3) for universal datalogger compatibility and low-power use, or RS485/Modbus-RTU for long cable runs or multi-sensor networks, both with built-in surge protection Compact size: 111 × 25.5 mm sensor body Reverse power protection: Built-in TVS/ESD protection Connector options: Cold-pressed terminal or stripped & tinned lead wires Configuration utility: SensorOneSet software (RS485) or SensorOneSetSDI12 software (SDI-12) included for sensor configuration Excellent price-performance ratio Cable length: 2 m standard; custom lengths available, up to 5 m maximum Applications Building automation - HVAC, indoor air quality, and demand-controlled ventilation Home appliances, including cooker hoods, air cleaners, and purifiers Laboratory applications Important Notes eTVOC and eCO2 are equivalent/estimated values calculated by the sensor's onboard algorithm from VOC readings, not a direct measurement of CO2 or a single named compound. Detailed eTVOC and eCO2 accuracy figures are provided in the user manual's Accuracy chapter rather than as a single headline number. The temperature sensing element is rated to +125°C, but the long-term operating temperature for the sensor as a whole is −40°C to +80°C. Custom cable lengths are limited to a maximum of 5 meters for this sensor. IP50 rated - protected against dust ingress and some direct contact, but not rated for washdown, submersion, or outdoor exposure to rain. Wall mounting installation only, in a non-condensing environment. Specifications eTVOC (Equivalent Total Volatile Organic Compounds) Range 0–65000 ppb Resolution 1 ppb eCO2 (Equivalent CO2) Range 400–65000 ppm Resolution 1 ppm Air Quality Index AQI-U (German UBA indoor air quality index) Range 1–5, resolution 1 AQI-S (relative air quality index) Range 0–500, resolution 1 Temperature Range −40°C to +125°C (long-term operating range −40°C to +80°C) Resolution 0.01°C Typical accuracy ±0.2°C Humidity Range 0–100% Resolution 0.01% Typical accuracy ±1.8% RH Electrical Output interface RS485 (Modbus-RTU) or SDI-12, V1.3 (selectable via ordering code) Power supply 5–28V DC Quiescent current (SDI-12) <4 mA (1 sample/sec); <500 µA (1 sample/min); <400 µA (1 sample/5 min), all @ 12V DC Quiescent current (RS485) <7 mA (1 sample/sec); <4 mA (1 sample/min); <3.5 mA (1 sample/5 min), all @ 12V DC Max. current during measurement <15 mA @ 12V DC Mechanical Dimensions 111 × 25.5 mm (sensor body, length × diameter) IP rating IP50 Connector Cold-pressed terminal or stripped & tinned lead wires (selectable via ordering code) Cable length 2 m standard; custom length available, max 5 m Installation Wall mounting Environmental Operating conditions −40°C to +80°C; 0–95% humidity, non-condensing Ordering Code Guide Code 1: Product Series DigiGas-VOC DigiGas-VOC, eTVOC, eCO2, AQI-U, AQI-S, air temperature, humidity sensor Code 2: Range and Accuracy A Default (see specification table) Code 3: Power Supply A X 5–28V DC Customize Code 4: Output Interface A B RS485 (Modbus-RTU) SDI-12 Code 5: Connector B C Cold-pressed terminal Stripped & tinned lead wires Code 6: Cable Length 002 XXX 2 meters Custom (XXX = length in meters, max 5 m) Default Variant: DigiGas-VOC-AAAB002 Measuring parameters eTVOC, eCO2, AQI-U, AQI-S, air temperature, and humidity Range and accuracy Default Power supply 5–28V DC Output interface RS485, Modbus-RTU Connector Cold-pressed terminal Cable length 2 meters Custom variants (power supply, output interface, connector, cable length) are available - contact us to discuss your requirements. Technical Documents User Manual SensorOneSet Configuration Utility (RS485) SensorOneSetSDI12 Configuration Utility (SDI-12) Modbus is a registered trademark of Schneider Electric. SDI-12 is a trademark of the SDI-12 Support Group. INFWIN is a registered trademark of Dalian Endeavour Technology Co., Ltd. MCCI and MCCI Catena are registered trademarks of MCCI Corporation. All other trademarks are the property of their respective owners.