I’m a still a rookie when it comes to opto so bear with me, I haven’t had to do this before so I need some help. I have the Snap-Pac-R1 and a flow meter that gives a 0-5 volt output for a 0-2 liter flow rate. The flow rate will vary over a 10-15 minute period and I would like to know the total flow for that period. I have no idea where to begin so any help is appreciated. Thanks.