Datasheet ZMOD4510 (IDT) - 9

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8. Gas Sensor Module Characteristics
Additional information about sensitivity and sensor influences are explained in detail in the following sections. All graphs and information show the typical responses that are to be expected from the ZMOD4510 Gas Sensor Module upon exposure to a variety of test conditions. For additional information, including application notes, white papers, blog, and manuals, visit www.idt.com/ZMOD4510.
8.1 Typical Gas Stimulation
The algorithm provided by IDT for the user’s microprocessor uses the output from the ZMOD4510 to determine the relative level of outdoor gases present (see IDT’s ZMOD4510 Programming Manual – Read Me; see section 12). The algorithm features an automated baseline correction function, ensuring that the module can learn from its environment and distinguish elevated levels of outdoor gases under all conditions. The proprietary metal oxide (MOx) used in the sensor ensures that the sensor module can respond effectively to changing Ozone and Nitrogen Oxide levels during long-term operation. There are many sources of poor outdoor air that can elevate the Air Quality Index (AQI). IDT has adopted the definition of Outdoor Air Quality and its impact on user health and comfort proposed by the US Environmental Protection Agency (EPA); see Table 7*. The ZMOD4510 Gas Sensor Module can detect the presence of elevated Ozone (O3) and Nitrogen Oxides (NO2) levels as described by the EPA. Each concentration is considered from a 1-hour class; however, in case the 1-hour value is not available a linear approach was assumed to calculate the AQI value. AQI values above 500 are considered beyond the AQI. The reported AQI from the ZMOD4510 sensor is derived from the calculated combination of NO2 and O3 present. Additional information on this topic, chemical background information, and measurement technologies is available in IDT’s ZMOD4510 White Paper – Overview Outdoor Air Quality.
Table 7. Air Quality Index Levels Described by the EPA* Air Quality Index (AQI) Level of Concern and Air Quality Condition NO2 Concentration [ppb] O3 Concentration [ppb] Color Code
0 to 50 Good 0 to 53 0 to 62 Green 51 to 100 Moderate 54 to 100 63 to 124 Yellow 101 to 150 Unhealthy for Sensitive Groups 101 to 360 125 to 164 Orange 151 to 200 Unhealthy 361 to 649 165 to 204 Red 201 to 300 Very unhealthy 650 to 1249 205 to 404 Purple 301 to 500 Hazardous 1250 to 2050 405 to 604 Maroon * AirNow, United States Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS), 2019 © 2019 Integrated Device Technology, Inc. 9 September 9, 2019 Document Outline 1. Pin Assignments 2. Pin Descriptions 3. Absolute Maximum Ratings 4. Operating Conditions 5. Electrical Characteristics 6. Block Diagram 7. Sensor Module Characteristics 7.1 Gas Sensor Module Characteristics 7.2 Internal Temperature Sensor Characteristics 8. Gas Sensor Module Characteristics 8.1 Typical Gas Stimulation 8.2 Environmental Temperature and Humidity 8.3 Accuracy and Conditioning 9. Assembly Restrictions, Operation, Integration Notes, and Storage 10. Test and Calibration 11. I2C Interface and Data Transmission Protocol 12. Related Websites and Software 13. Glossary 14. Package Outline Drawings 15. Marking Diagram 16. Ordering Information 17. Revision History