What is the relationship between differential pressure and flow rate?
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I found tons of formulas online, but I don’t know how to use them. What formulas should a meter technician know? Do instrument technicians need to master all various parameters available online, such as Reynolds numbers, orifice plate areas, density, and so on?
Take a look at a textbook on Principles of Chemical Engineering; what you’re saying is hard to put into words； As for whether it’s necessary to master it, it depends on you; it can never hurt to learn more.