A Scientific Selection Guide for Measuring the Flow of Mixed Gases 

    In fields such as petrochemicals, environmental monitoring, and energy metering, the flow measurement of mixed gases has always been a crucial part of industrial automation. For mixed gases with different compositions and operating conditions, choosing the appropriate flowmeter has become a key concern for many engineers.

 Special Considerations for Measuring Mixed Gases

   Due to the complex and variable composition of mixed gases, their physical properties (such as density, viscosity, and conductivity) are often unstable, which poses higher requirements for flow measurement. Traditional single-gas flowmeters may experience reduced accuracy and insufficient stability when measuring mixed gases.

   Comparison of Mainstream Flowmeter Technologies

    Thermal Mass Flowmeter: Measures mass flow by detecting changes in the thermal conductivity of the gas, unaffected by pressure and temperature variations, making it suitable for relatively stable mixed gases in terms of composition. 

     Ultrasonic flowmeter: Utilizing the principle of time difference of sound wave propagation, it has no pressure loss, a wide range ratio, and is suitable for large-diameter pipeline measurement. However, it has certain requirements for gas purity.

Differential pressure flowmeter: Simple and reliable in structure, it needs to be used in conjunction with a component analyzer and is suitable for mixed gases with known and fixed components.

     Coriolis mass flowmeter: Directly measures mass flow, with high accuracy, but has a relatively high initial investment cost. It is suitable for the measurement of high-value gases.

Key selection factors

     Frequency of component changes: For mixed gases with frequent component changes, it is recommended to choose a mass flowmeter.

Pressure and temperature range: Special models should be selected for extreme working conditions.

      Measurement accuracy requirements: For trade settlement, a precision of 0.5 grade or above is required.

      Pipe size: For small pipe diameters, thermal flowmeters are preferred; for large pipe diameters, ultrasonic flowmeters are considered.

Budget cost: Balance initial investment and long-term maintenance costs. 

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