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The Series PI Piston In-Line Variable Area Flowmeter is a series of mechanical piston variable area flow meters with visual and electronic output options. The Series PI is offered with inscribed scale displays via pointer or numeric digital LCD options. It offers mechanical switch output options and electronic output options such as 4-20 mA analog output, and HART® protocol. It is available in pipe sizes 1/4" to 1" (8 to 25 mm) and flows of 0.25 to 30 GPM (5 to 100 LPM) for liquids with viscosity up to 650 centistokes.