CO Meter - How the TWA Reading is Calculated

The CO Meter (Carbon Monoxide) offers a TWA (Time Weighted Average) reading in addition to the instantaneous CO reading. See the formula to calculate this value below.

[For the TWA formula of the CO2 (Carbon Dioxide) Meter, go here.]

TWA Formula

The CO Meter performs a 7.5 Hour TWA currently. The sensor updates TWA every 15 minutes. It averages together an array of 30x CO values (each value a 15 minute average of CO) to calculate TWA. Under the hood we measure CO every 5 seconds and every 15 minutes we take the average of the previous 180 CO readings (15 minute’s worth) and overwrite the oldest element in the 30x array with this new value.

There are future plans for updating the TWA formula in the future to 8 hours but this has not yet been implemented as of Q4 2022. This update is currently unplanned.

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