> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/external-sensors-in-incubators/ivftech-freygen/co2.md).

# CO2

There is no acces port for CO2 sensor but the GMP251 sensor can be installed externally using a flow-through adapter, order code ASM211697SP.

<figure><img src="/files/htxrECK54wlmPRRkuQ0Y" alt=""><figcaption></figcaption></figure>

The flow-through option requires the flow in the range defined in the GMP251 datasheet.

<figure><img src="/files/e9hwHkmb7tAkkIKHynTl" alt=""><figcaption></figcaption></figure>

The flow measured in the incubator is around 0.4l/min and is in the middle of the recommended range.

The sensor is connected in series with the incubator CO2 filter using tubes. This shall be done by the incubator representative technician.

<figure><img src="/files/2sbgDtXJwbI6NZeNEw3e" alt=""><figcaption></figcaption></figure>


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