Hi,

If I understood correctly (and also based on by observation), N/A mean the 
> sensor didn't sent anything since last record interval. 


or what it sent was rejected (maybe by the driver or maybe by StdQC) or the 
sensor does not exist
 

> So it means sensor emissions shall be at least twice faster than record 
> interval to insure we get at least one value. 
>

That will give you at least 2 values per archive interval. You can have the 
sensor emit a value at the same period as (or less then) your archive 
interval and you will get at least one value.

Gary

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