But I am needing to get a total scfm flow for the day from our ABPLC.
I am wanting a 24 hour average.
SCFM normally means Standard Cubic Feet per Minute (Ft3/Minute). Getting a "total" for that doesn't have much meaning. Do you mean that you want to calculate the total Cubic Feet of flow for each 24-hour period? Do that as Dan said, pick a time period, read the SCFM at the expiration of each time period, multiply the reading by the time period in fractions of minutes, add that Cubic Feet of volume to a total volume, then repeat for each time period until 24 hours have passed.
Now to get an average for the PAST 24 hours, divide the total calculated above by some time period. The hourly average for the past 24 hours would be Total Cubic Feet / 24 = Average SCF per hour. The average per minute would be Total Cubic Feet / (24 x 60) = Average SCFM.
You can compute a "running average", or the average SCFM in the last 24 hour period, with oldest reading dropped off and newest reading added. Each minute you read the SCFM and add to a total, subtract off the oldest reading (or to avoid having to store 1440 values, just subtract the current average), then divide the total by 1440 minutes, and display running average SCFM.
Another way to compute a "running average", is to calculate the average SCFM in the last 24 hour period UP UNTIL NOW. You pick a 24-hour start time, then each minute read the SCFM and add to a total, divide total by elapsed minutes, and display running average SCFM. At end of period, the total is reset to zero and a new period starts.
Which way you pick to do the average depends on what is most useful.