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Just found pulse_diff in the github code. I guess that what Is what I want. 

Just add a feed and log the pulse directly and then use pulse_diff to get the difference. If counter reset the function will handle it. 

Could you describe in detail, so that o newbee understand? :)

To do that would mean duplicating a lot of this website inside one post. Much as I would like to, that is quite impractical.

So I suggest you read up about pulse counting using the emonTX and emonCMS here, then you will understand the basic problem. Next, read up on a Linux website what a cron job and owfs is, which is how Haggan aims to implement part of the processing. He's using an interface presumably on a Raspberry Pi to receive pulses. He could equally have chosen an emonTx and Raspberry Pi base to get the data from his meter to emonCMS. 

When you have done that, you will be in a much better position to understand what his post really means.

Cron, owfs, linux.. Roger, I'm well aware, nor do I have a problem wrapping the logic in my mind. To calculate pulses based on time and properties of a power meter is fairly easy. Of course depending on hardware and how accurate one like the result.

i'll read in how to talk sense with emoncms, thx!

Do I detect that your question was less than specific? The best way to learn emonCMS is to play with it. (The documentation tends to lag behind the development somewhat.)