What process information is required for the design of the measuring device? 2015/12/14 What process information is required for the design of the measuring device? Where can the measuring value be read on the variable area flow meter? What is the impact of a different reference temperature? Posted in FAQs Overview We require the following information in order to provide you with an optimal solution: gas type, desired measuring range, temperature, inlet pressure and outlet pressure. It is wise to submit the range under which these variable change as well.