'Generic 4-20 mA Input measurement 'Flow' span on flow meter 0-100 gpm
VoltDiff(Flow,1,mV2500,2,True,0,_60Hz,0.0625,-25)
I assume "gpm" is gallons per minute, correct? If you measure the signal ouput every 60s, you can use the "Totalise" instructions in hourly and daily tables of that measured reading to give you your total over the hour and day.
Totalize (1,Flow,FP2,False)