Variable Area Flow Meter Corrections Getting Accurate Readings from Variable Area Flow Meters Most variable area flow meters are factory-calibrated for air or water at standard conditions (70 °F and 14.7 PSIA). But when real-world pressure, temperature, or gas type changes, the reading can drift from the true flow. To correct this, apply two simple formulas: one to account for pressure and temperature changes, and another for gas specific gravity. Together, they convert the indicated flow to actual standard flow. DwyerOmega’s Series VF, VA, and Rate-Master® RM flow meters deliver reliable measurements when paired with proper correction—helping you maintain accuracy across any application.
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