7Semi SGP41 + SHT45 Temp Humidity VOC NOx Sensor Probe

The 7Semi SGP41 + SHT45 Environmental Sensor Probe is a compact 4-in-1 sensing solution designed to monitor temperature, relative humidity, VOC, and NOx-related air-quality changes. It combines the Sensirion SHT45 for high-accuracy temperature and humidity measurement with the SGP41 gas sensor for VOC and NOx monitoring, making it suitable for indoor air-quality systems, HVAC equipment, air purifiers, smart buildings, environmental monitoring, and IoT applications.

The SHT45 provides ±0.1°C typical temperature accuracy and ±1.0% RH typical humidity accuracy, while the SGP41 detects changes associated with volatile organic compounds and nitrogen oxides. Sensirion's Gas Index Algorithm can convert the gas-sensor signals into separate VOC and NOx Index values from 0 to 500, providing an easy-to-use indication of changes in indoor air quality.

Both sensors communicate through the I²C interface, using separate fixed addresses of 0x44 for the SHT45 and 0x59 for the SGP41. The remote probe construction allows the sensor to be positioned away from heat-generating control electronics, while the 1-meter cable provides flexibility for installation and environmental monitoring applications.

Features

• 4-in-1 Environmental Monitoring: Combines temperature, relative humidity, VOC, and NOx monitoring using Sensirion SHT45 and SGP41 sensors in a single probe.

• High-Accuracy Temperature Measurement: Provides ±0.1°C typical temperature accuracy using the integrated SHT45 sensor.

• High-Accuracy Humidity Measurement: Provides ±1.0% RH typical humidity accuracy for reliable environmental monitoring.

• VOC and NOx Air-Quality Monitoring: Detects changes associated with volatile organic compounds and nitrogen oxides for indoor air-quality applications.

• VOC and NOx Index Output: Supports processed VOC and NOx Index values from 0 to 500 using Sensirion's Gas Index Algorithm.

• Dual I²C Sensor Interface: Provides digital communication with fixed 0x44 for SHT45 and 0x59 for SGP41 addresses.

• Humidity-Compensated Gas Sensing: Temperature and humidity measurements can be used by the SGP41 for compensated VOC and NOx sensing.

• Integrated SHT45 Heater: Includes an internal heater to support operation in demanding humidity and condensation-prone environments.

• Remote Probe Design: A 1-meter cable allows the sensing element to be positioned away from heat-generating control electronics.

• Ventilated Probe Housing: Features ventilation holes that allow ambient air to reach the sensing elements for effective temperature, humidity, VOC, and NOx monitoring.
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• Optional SHT45 Protective Membrane: The SHT45 sensing element can be provided with an optional breathable protective membrane to help protect it from dust, water droplets, and environmental contaminants while maintaining airflow for accurate temperature and humidity measurement.

Customization: The SHT45 breathable protective membrane, probe operating temperature range, and probe dimensions/length can be customized for quantity orders based on application requirements. Contact info@7semi.com for more details.

Resources

SGP41 Datasheet

SHT45 Datasheet

Arduino Library for SHT45

Arduino Library for SGP41