Infineon recommends that you isolate the sensor from vibration sources. The operating frequency of the sensor is 40 Hz. If vibration is expected at exactly 40 Hz with very high acceleration (≤ 0.3 g), you should do the following to minimize the vibration impact:
However, for a typical application, the impact of vibration is minimal. As shown in Figure 2, for a test setup with three sensors mounted on a commercially available air purifier, the test result shows that with the denoiser filter enabled, the sensor is robust against the vibration generated by a different fan of the air purifier.
Figure 2. Vibration robustness of XENSIVTM PAS CO2
For more details, visit the CO2 sensor website and see the application note, General design in guidelines for XENSIV™ PAS CO2 sensor.
Figure 3. Impact of CO2 on the human body at various concentration levels
One such setup is as follows:
Evaluation kits are already available with major distributors.
Figure 4. Average power consumption
For more information, see Section 3 of the application note, XENSIV™ PAS CO2 for low-power applications.
With the automatic baseline offset correction (ABOC) feature enabled, the sensor accuracy drifts by 1% every year.
Figure 5. Values of pressure and acoustic stability
See Section 4.1.5 - Transfer function table in the datasheet.
Each sensor is calibrated during our production for the complete operating range. Production calibration is done with highly accurate CO2 gas bottle and verified with an ideal reference sensor.
The sensor might show small amount of offset after assembly due to stress generated from the assembly process on the light source. Therefore, to get the best performance, this offset should be corrected using either FCS or ABOC.
For the FCS calibration, you need to have a reference sensor. In the ABOC mechanism, the device keeps track of the minimum value recorded over a week. The offset to the reference baseline is computed and used to calculate the correction factor to be applied for the week after.
Figure 6. Operation of the ABOC feature
See the application note, After-assembly calibration scheme for XENSIV™ PAS CO2 for more details.
Figure 7. Airflow direction
See the application note, General design in guidelines for XENSIV™ PAS CO2 sensor for details.
Note: For more information, see the Community webpage for CO2 sensor where you can find answers to your questions and ask your own.