What is Sensirion’s NO_x Index?
■ Instead of concentration output, which cannot be properly provided under field conditions, the NOx Index much better exploits the capabilities of a MOX sensor by being sensitive towards oxidizing gases. For this, the raw signal of the SGP41’s NOx pixel is processed by Sensirion’s powerful Gas Index Algorithm on an external microcontroller. The NOx Index describes the current NOx condition in a room relative to the sensor’s recent history. In this way, the NOx Index behaves like a human nose. Assuming that we are entering a room from outside, our nose will take the air composition outside the room as an offset (baseline) and provide us with feedback if it recognizes higher or lower levels of gases when entering the room. The NOx Index performs similarly by applying a moving average over the past 24 hours (called the learning time).
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Technical Documentation |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2022/4/2 |
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331 KB |
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