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Assessing BME688 Sensor Performance Under Controlled Outdoor-like Environmental Conditions.

Enza Panzardi1, Ada Fort1, Valerio Vignoli1

  • 1Department of Information Engineering and Mathematical Science, University of Siena, 53100 Siena, Italy.

Sensors (Basel, Switzerland)
|December 11, 2025
PubMed
Summary
This summary is machine-generated.

Low-cost tin dioxide gas sensors show promise for outdoor air quality monitoring. Performance is affected by humidity and temperature, requiring calibration for accurate, comparable data in monitoring networks.

Keywords:
MOX gas sensorsair qualitygas sensor characterizationgas sensorspollution monitoring

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Area of Science:

  • Environmental Science
  • Sensor Technology
  • Materials Science

Background:

  • Miniaturized gas sensors are crucial for outdoor air quality monitoring.
  • Characterizing sensor performance under real-world conditions is essential.

Purpose of the Study:

  • Evaluate the dynamic gas response of the Bosch BME688 tin dioxide sensor.
  • Assess sensitivity, selectivity, and response to key air pollutants (NO2, CO, SO2, isobutylene).
  • Provide quantitative metrics and a physicochemical interpretation of the sensing mechanism.

Main Methods:

  • Controlled experiments in a custom test chamber with precise regulation of temperature, humidity, and gas concentrations (ppm to sub-ppm).
  • Analysis of sensor response, recovery times, and baseline resistance variability.
  • Investigation of humidity and temperature effects on sensor performance.

Main Results:

  • Optimal operating temperatures are 360-400 °C, yielding response/recovery times of a few minutes.
  • Humidity generally decreases sensitivity but improves kinetics, with enhanced CO response via hydroxyl pathways.
  • Baseline resistance variability necessitates normalization and individual calibration for cross-sensor comparability.

Conclusions:

  • The BME688 sensor is feasible for distributed outdoor monitoring if humidity and temperature effects are managed.
  • Normalization and individual calibration are critical for ensuring reliable, comparable data.
  • Findings support the development of robust, low-cost air monitoring networks.