The RS485 VOC, NOx, Temperature & Humidity Sensor (S-AQI-01A) combines VOC and NOx monitoring with temperature, humidity and dew point measurements, providing real-time indoor air quality data over RS485 Modbus RTU.
The SeeedRS485 VOC, NOx, Temperature & Humidity Sensor (S-AQI-01A) is a compact multi-parameter air quality sensor designed for indoor environment monitoring.
Built with the Sensirion SGP41 sensor, it accurately measures VOC and NOx indexes while providing temperature, humidity, and dew point readings for comprehensive air quality analysis.
With 1-second measurement updates, the sensor provides real-time air quality data for monitoring and control systems. It supports RS485 Modbus RTU communication and a wide 5-28 V DC power input, making it easy to integrate into air purifiers, HVAC systems, and other smart environmental monitoring solutions.
The IP50 wall-mounted enclosure supports flexible installation, while built-in surge, reverse polarity, TVS, and ESD protection ensure stable operation in various applications. Ideal for indoor air quality monitoring, scientific research, laboratories, warehouses, cold chain facilities, and demand-controlled ventilation systems.
Please note that this sensor is designed for indoor use and is not suitable for direct outdoor installation. The IP50 enclosure provides protection against dust and is not waterproof, please avoid exposure to rain, water splashes, or high-moisture environments.
Features
Comprehensive Indoor Air Quality Monitoring: Measures VOC index, NOx index, temperature, humidity, and dew point in a single device. The integrated Sensirion SGP41 MOX sensor provides reliable VOC and NOx index values for evaluating indoor air quality, while the built-in temperature and humidity sensing delivers additional environmental context essential for understanding overall air conditions.
High Accuracy with Configurable Calibration: Provides both original and calibrated values for temperature, humidity, and dew point. Configurable temperature and humidity offset calibration allows users to compensate for installation-specific conditions and improve measurement accuracy in different environments.
Flexible RS485 System Integration: Uses RS485 Modbus-RTU for reliable long-distance communication and supports multiple sensors on one bus. Configurable device address (0–255), baud rate (1200–38400 bps), parity, stop bits, and data format simplify integration with PLCs, data loggers, controllers, and monitoring systems.
Low-Power Design for Flexible Deployment: The sensor operates on a wide 5–28V DC power supply with a quiescent current below 5 mA at 12 V DC, making it suitable for energy-efficient and battery-powered applications. The compact IP50 wall-mounted enclosure enables easy installation, while built-in reverse-polarity, surge, TVS, and ESD protection ensure reliable operation.
LoRaWAN® Connectivity with SenseCAP S2100: SenseCAP S2100 Data Logger can connect to Modbus RS485/Analog/GPIO industrial sensors including the Grow Your Idea and transmit data from sensors to the LoRaWAN network. Benefiting from its high robustness and waterproof and dustproof enclosure, the S2100 data logger can work under harsh environments such as high UV exposure, heavy rain, dusty conditions, etc. With built-in Bluetooth, it enables quick setup and OTA updates via the mobile app. It can be battery-powered or connected to a 12V external power supply. When the 12V power supply is connected, the replaceable built-in battery is used as a backup power supply, supporting lower power consumption.
