The scaling factor (0.0031) is not a big deal: you can just enter 0.31 or whatever can be represented, and then just keep in mind to scale it further down by 100 when you look at the numbers. The constant term (7 in your case) is a bit odd: I have never seen a flow meter that has a constant shift term. What’s the reason to have this term? Do you have a link to the flow meter so I can take a look at the spec?