Ahah! Differential pressure across an orifice plate. How quaint!
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
ABB, Endress + Hauser (usual disclaimer) and many others have details of their equipment on their websites.
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"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856