If ratio = 1 then 15530=15530 pulses/minute -> 255 pulses/sec which is equal to 255Hz so flowrate = 2.55 LPM .
I don't know what PPR is but I assume PPR is ratio, isn't it? For fans, ratio is typically=2 (2 pulses per rev). If ratio=2 then real frequency is 255*2 so flowrate will be 5.10 LPM. Leave ratio=1 if you can, it's easier to calculate in mind.
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