How to monitor indoor CO2

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How to monitor indoor CO2
Presented by
Hibouair.com
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CO2 is a gas and cannot be monitored with typical
light-scattering laser sensors used to measure
PM.
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Instead, CO2 is best measured with sensors that
use infrared (IR) light to estimate the number of
CO2 molecules in ambient air
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Heres how this works
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Ambient air passes through a CO2 sensor assembly
made up of an IR light source, reflective gas
cell, and IR light detectors.
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IR light shines onto CO2 molecules that pass
through the assembly. The CO2 molecules absorb
much of this light.
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The remaining light that isnt absorbed by CO2
molecules passes through to detectors.
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IR light detectors calculate the change in IR
wavelengths from what was produced by the IR
light source to what remains after CO2 absorbs
the IR light.
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The change in wavelength indicates the
concentration of CO2, which is converted to a ppm
reading
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A standalone CO2 sensor may indicate the presence
of elevated indoor CO2 and meet basic CO2
monitoring requirements for workplaces and
schools.
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A study published by the ACS suggests that indoor
CO2 levels may be one tool to help
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