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Altitude Compensation for Gas Sensors

Altitude Compensation for Gas Sensors

A customer called recently and said we had sold him a defective CO2 sensor module. He had calibrated it precisely at 0.0ppm (zero parts-per-million), took it outside, and the sensor read 335ppm. “Where do you live?” we asked. “Colorado,” he replied. It took a few minutes to explain, but in the end the customer understood that altitude makes a difference when you are measuring CO2 levels. CO2 sensor modules are calibrated at sea level, and are not designed to automatically compensate for changes to CO2 at higher altitudes. When you think about altitude, it helps to imagine a vertical column...

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