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• Pressure drops through the valves and filters do not affect the reading. The pressure
inside the meter and at the gas outlet is equal to the pressure at the orifice
downstream point.
• The correct expansion factor for the downstream point is used in the orifice flow
calculations.
• The measured density at the density point is used in the mass flow calculation, as
defined by ISO 5167 and AGA 3.
Meter installation in differential pressure application
An alternative to the downstream installation method is the upstream installation method,
as defined by AGA 3. This method is also known as the differential pressure method, which
is optimal for orifice plate metering. A disadvantage of this installation is that the sample
gas flow is not measured because it bypasses the orifice plate.
Planning
Installation Manual 9