I am using PAS CO2 sensor in single shot mode. Power up sequence: +3.3V , then +12V, then wait minimum 1s.
PWM_DIS connected to 3.3V, PSEL connected to GND.
I trigger a measurement every minute, enabling ABOC in the field BOC_CFG (register MEAS_CFG). [write 0x05 into MEAS_CFG]
Then I wait minimum 2 seconds, and afterwards I read out the measurement value. Outdoor (country side, clean air) I get values around 800ppm. Whether I enable or not the ABOC, the measured values seem to be the same.
Am I missing something?
In the end I assumed there is a sensor offset of ~400ppm, and I subtracted it from the measured values. Is this a valid approach?Show Less
Actual Measurement Result
When CO2 was injected into the closed space with the PAS CO2 Sensor, the CO2 concentration in the GUI increased immediately.
16:10:49(JST)/500ppm ⇒ 16:10:59(JST)/1500ppm
After that, it stabilizes at 32618ppm.
Leave PAS CO2 from enclosed space to open space (≈400ppm) at 16:16:39(JST)
16:31:39(JST)/436ppm, Finally back to the CO2 concentration of the open space. Why does it take so long, 15 minutes, to get back to normal?
Translated with www.DeepL.com/Translator (free version)Show Less
The effect of voltage input to the accuracy of CO2 sensor?
- I want to know about the effect of input voltage to the accuracy of CO2 sensor. As in the CO2 datasheet, 12V supply voltage is Min = 9.6V and Max = 14.4V. Will accuracy of CO2 sensor change when the input voltage varies in this range?Show Less
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