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# CO₂ calibration

The TX CO2 T\&H AMB is delivered pre-calibrated. If you notice a drift in the measured CO2 values over time, you can manually recalibrate them on a “fresh-air” basis. To ensure the best possible calibration, we recommend calibrating the products by following the procedure below.

## **Calibration procedure** CO₂

<table data-card-size="large" data-view="cards"><thead><tr><th></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><ol><li>When the sensor is powered, place it near a window. The window must be open so that the air in which the transmitter will be calibrated is fresh.</li></ol></td><td><a href="/files/8c60f9a038679a765c673d0a8977408f5b541867">/files/8c60f9a038679a765c673d0a8977408f5b541867</a></td></tr><tr><td><ol start="2"><li>Press the sensor push button until the orange LED lights up. Do not release until the orange LED lights up (after about 15 s). This means the calibration process has started.</li></ol></td><td><a href="/files/6d9728249261c778753bf5ba0c33fe9178c9e9bc">/files/6d9728249261c778753bf5ba0c33fe9178c9e9bc</a></td></tr><tr><td><ol start="3"><li>Move away from the sensor and let the calibration take place. The process takes about 3 minutes. The orange LED flashes periodically during the calibration phase.</li></ol></td><td><a href="/files/0c5b71c413f732067d4563df47a37ae752ec0023">/files/0c5b71c413f732067d4563df47a37ae752ec0023</a></td></tr><tr><td><ol start="4"><li>When the LEDs stop blinking, this means the calibration is complete. You can take the sensor back and install it in its final location.</li></ol></td><td><a href="/files/b65b7cc557e472f9503531585834b0e1a37d22cf">/files/b65b7cc557e472f9503531585834b0e1a37d22cf</a></td></tr></tbody></table>


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