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LOGO! - Projects: Flowrate Including pulses Logo 8

Hi.
I have a flowmeter with puls output, abt 930 pulses per liter.
I have managed to arrange the total volyme, with counter and it´s quite simple, but i also want the momentary flow every minute.
And there I have a slight problem because the momentary flow or rate needs to be "erased or updated" otherwise the momentary flow will not change so much when time have passed on to long.
Im using a mathematic instruction and a timer, but sometimes when it resets, the mathematic instruction calculate it as a overflow because there´s no values yet. 
The counter is set to 1 with 10 pulses, easier during simulation.
Does someone have a solution on this one? 

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