Dear fellows,

I'm trying to understand the definition mentioned for the TWA method used by the S600 to calculate the flow average but couldn't get much further.

I fount the definition at the manual extremely confusing as shown below:

The only thing I need to assure is that the TWA takes into account JUST the periods where the flow isn't zero an then returns me the flow weighted mean using the time as "weight" except when there is no flow. Is this the calculation that the TWA actually does?

*For each period type (i.e. hourly, daily, monthly) the task relies upon the elapsed time for the period, multiplied by the present TWA value to give the “weight” for the average. The latest measured value (of the variable being averaged), multiplied by the elapsed time since the last TWA calculation was performed, gives the new “weight” to be incorporated into the whole. This is only calculated when the flow rate is greater than zero.*

Kind regards,

Vitor