Gas turbine flow meters are widely recognized for their high accuracy, quick response, and excellent stability, making them ideal for measuring industrial gases. However, the choice of gas medium significantly affects the meter’s performance and lifespan. Inappropriate media can result in inaccurate readings or equipment damage.

This guide outlines recommended gas types and explains how to match gas turbine flow meters to specific applications, helping you make the right selection.


These gases are clean, dry, and non-corrosive — ideal for turbine flow meters.

  • Common Examples:
    • Natural Gas (NG)
    • Compressed Air
    • Nitrogen (N₂)
    • Oxygen (O₂)
    • Argon (Ar)
  • Benefits:
    • High measurement accuracy (±0.5% to ±1%)
    • Long operational life (over 10 years)

⚠️ Moderately Corrosive or Moist Gases

These require specialized materials or coatings.

  • Examples:
    • Carbon Dioxide (CO₂)
    • Methane (CH₄)
    • Liquefied Petroleum Gas (LPG)
    • Biogas (after desulfurization)
  • Solution:
    Use 316L stainless steel or PTFE-coated components to resist corrosion.

💨 Low-Pressure Saturated Steam

  • Condition: Requires compensation for temperature and pressure.
  • Solution: Choose turbine flow meters with integrated sensors for temperature and pressure.

2. Gases That Require Caution or Alternatives

Highly Corrosive Gases

  • Examples: Chlorine (Cl₂), Hydrogen Sulfide (H₂S)
  • Risk: Rapid corrosion of impellers and bearings
  • Alternative: Use vortex flow meters or ultrasonic flow meters

Gases Containing Liquids, Dust, or Particulates

  • Examples: Moist air, unfiltered industrial exhaust
  • Issue: Particles may block the impeller; moisture can rust internal parts
  • Solution: Install gas filters or separators (5–10 μm recommended)

High-Viscosity or Condensable Gases

  • Examples: Heavy hydrocarbons, wet natural gas
  • Risk: Adhesion on impellers leading to incorrect readings or blockage
  • Solution: Use heating systems or switch to thermal mass flow meters

3. Selecting the Right Flow Meter for Your Application

📊 By Industry

IndustryTypical MediaRecommended Features
Oil & GasNG, LPG, CNG±0.5% accuracy, ATEX explosion-proof certification
Chemical ProcessingAmmonia, CO₂, Inert GasesAnti-corrosion materials (Hastelloy, PTFE coating)
Power & MetallurgyOxygen, Compressed AirWide turndown ratio (up to 1:50), high-temperature resistance
EnvironmentalBiogas, landfill gasAnti-clogging design, temperature & pressure compensation
Medical & FoodMedical Oxygen, NitrogenSanitary-grade stainless steel, electropolished surface

🛠 By Measurement Needs

  • Trade Measurement:
    Use 0.5% accuracy class, with pulse output and HART communication.
  • Process Control:
    Opt for 1.0% accuracy class and anti-vibration design.
  • Corrosive Environment:
    Select meters with 316L stainless steel + PTFE coating.
  • Small Flow Applications:
    Choose low starting flow models (e.g., starting from 0.5 m/s).

Conclusion

Gas turbine flow meters are best suited for clean, dry, non-corrosive gases, but with proper material selection and accessories, they can be adapted to a variety of challenging environments. Understanding your gas properties and application requirements is crucial to maximizing accuracy, longevity, and reliability.

To further explore gas flow metering technologies, check out our in-depth article on
👉 How Does a Gas Flow Meter Work?

If you’re unsure which model fits your use case, contact Aister Instrument for professional guidance or use their AI-powered selection tool.