Zero calibration and span point adjustment are often done at the same time, but are different and serve two different purposes.
NDIR gas sensors (non-dispersive infrared sensors) detect specific gases in the air. For them to work as accurately as possible, they need to occasionally undergo zero calibration and span point adjustment.
What is Zero Calibration?
Zero calibration gives the sensor a starting point. It defines what the sensor displays when there’s no target gas present. During this process, the sensor is shown none of the specific gas it is looking for, and told that the level it sees is zero. This helps make sure the sensor doesn't give a false reading when no gas is present. However, over time, even the best NDIR sensor will experience drift in its ba-seline, leading it to report a tiny variation from the actual concentration of gas present. The sensor is not broken - it can “see” as well as it always could. It just needs to be reminded where to start.
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发布时间：2026/1/19
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