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Series <strong>PFMV</strong>Model SelectionNozzle Diameter and Flow Characteristics (Approximate values)Use the following graphs as a reference to select sensor measuring range.P2: Nozzle internal pressureNozzle Diameter – Flow Characteristics (Vacuum)5.04.5P1: Atmospheric pressureNozzle Diameter – Flow Characteristics (Positive pressure)5.0ø0.6ø0.54.54.03.5ø0.44.03.5ø0.6ø0.53.02.52.0Flow rate [l/min]ø0.33.02.52.0Flow rate [l/min]ø0.41.5ø0.21.5ø0.31.01.0ø0.20.5ø0.10.0–80 –60 –40 –20 0P2 [kPa]0.00 50 100 150 200 250 300P2 [kPa]ø0.10.5Example (Vacuum)Selecting conditions:Nozzle diameter: ø0.3P1: 0 [kPa]P2: –60 [kPa]The flow rate will be 0.7 to 0.8 [l/min] based on the graph.® Select the <strong>PFMV</strong>510-1.Example (Positive pressure)Selecting conditions:Nozzle diameter: ø0.3P1: 0 [kPa]P2: 20 [kPa]The flow rate will be 0.7 to 0.8 [l/min] based on the graph.® Select the <strong>PFMV</strong>510-1.P1NozzleP2Vacuum source(Vacuum pump)P1NozzleP2Note) Since the calculated value may not meet the approximate value due to leakage and pressure loss in the piping system, please check theresult by using actual equipment.950
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