Datasheet ZMOD4510 (IDT) - 10

link to page 10 link to page 9 link to page 10 ZMOD4510 Datasheet
8.2 Environmental Temperature and Humidity
The sensor module is tested, qualified, and functional in the operation range of -40°C to +65°C. Figure 2 shows the module’s sensitivity during operation to variations in relative humidity while stimulated with 100ppb Nitrogen Dioxide (NO2). Due to the low influence of humidity, there is additional humidity measurement and no algorithmic compensation necessary.
Figure 2. Humidity Influence on the Sensitivity for 100ppb NO2 8.3 Accuracy and Conditioning
All IDT gas sensor modules come with electrical and chemical factory calibration with data stored in the module’s nonvolatile memory (NVM). Using the software provided by IDT and the calibration coefficients in the NVM will lead to stable measurements of the AQI levels discussed in section 8.1. The ZMOD4510 will respond to typical outdoor gases immediate upon start-up; however, a conditioning period of 48 hours in an outdoor environment is recommended to improve stability and get maximum performance. Users who require an absolute measurement with the maximum achievable accuracy are advised to re-calibrate the sensor with a known outdoor air compound. This enables an absolute accuracy of ±15%; see Table 8. For some environments, an interference response to siloxanes is of concern; however, IDT’s ZMOD4510 gas sensors have been proven to be resistant against siloxanes. A maximum potential life-time exposure has been simulated in all ZMOD4510 operation modes by applying the chemicals D4 (Octamethylcyclotetrasiloxane) and D5 (Decamethylcyclopentasiloxane) in high concentration for several hundred hours.
Table 8. Typical ZMOD4510 Sensor Module Accuracy Achievable with Calibration Symbol Parameter Conditions Minimum Typical Maximum Unit
Accuracy With additional calibration ±15 % Durability to Siloxanes Change in sensitivity ±8 % © 2019 Integrated Device Technology, Inc. 10 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