Adaptability of PAS CO2 for wearable products

[h_nakamura]

Hi,
When the PAS CO2 is built onto the wearable products* then the PAS CO2 is always affected of vibration and shock and can it measure the CO2 concentration accurately?
is there the particular frequency to affect the measurement?
*:Products that fit in your pocket or attach to your helmet

Best regards,
N.N

[George_T]

Hi @h_nakamura,

The design guideline document for CO2 sensor mentions that low frequency vibrations can affect the sensor performance, but the sensor can be isolated from vibration to a great extent. Effective ways to avoid the issue is also explained in the document: proper placement of the sensor and by enabling the denoiser filter (section: 3.2, page: 4-5). The implementation and measurement results in an air purifier in the document shows that vibration effects are not affecting the sensor performance (section: 4.2, page: 9-10).

Regarding the frequency that can affect the measurement, the sensor is affected by low frequencies as it is utilizing a microphone. A robust package ensures that the sensor is acoustically isolated from surrounding noise. Both the data sheet (section: 4.1.6, page: 9) and design guideline document (section: 4.1, page: 9) clearly shows that the sensor is  least affected by pink noise up to 95 dB for frequencies from 100 Hz to 10 kHz. 

Thanks and regards,

George

[h_nakamura]

Hi George,
Thanks for your prompt reply.
I think that the vibration to the wearable device due to walking etc. is about 1Hz to 10Hz, but is there any influence in this range?

Best regards,
H.N

[George_T · Accepted solution]

Hello @h_nakamura ,

The sensor will function properly in the required frequency range (1 Hz to 10 Hz).

Best regards,

George