In industrial flow measurement, vortex flow meters have become one of the most popular choices due to their wide applicability, high accuracy, and low pressure loss. They are suitable for measuring gases, liquids, and steam in industries such as power generation, chemical processing, and oil & gas. However, selecting the right model can be challenging given the diversity of working conditions and product specifications.

This article outlines five essential selection factors and a step-by-step selection process to help you make the right decision.

Five Key Factors for Choosing a Vortex Flow Meter

1. Fluid Characteristics

  • Identify whether the medium is gas, liquid, or steam.
  • Consider temperature, pressure, density, viscosity, and corrosiveness.
  • High-viscosity fluids (e.g., heavy oil) are usually unsuitable.
  • For steam applications, distinguish between saturated and superheated steam, as density differs.
  • For corrosive media, select corrosion-resistant materials such as 316L stainless steel or Hastelloy.

👉 Related reading: Coriolis Mass Flow Meter Applications

2. Flow Range and Pipe Size

  • Ensure that the operating flow falls within 50%–66% of the flow meter’s measuring range.
  • If the meter size does not match the pipeline, use reducers/expanders carefully to avoid excessive pressure loss.
  • Common pipe sizes: DN15 to DN300.

3. Temperature and Pressure Limits

  • Standard vortex flow meters typically support -40°C to 350°C, while high-temperature types can exceed 400°C.
  • Select a pressure rating (PN16, PN25, PN40, etc.) higher than your system’s working pressure to ensure safety.

4. Installation and Environmental Conditions

  • Maintain a straight run: 10D upstream and 5D downstream (D = pipe diameter).
  • Avoid vibration from pumps or compressors, or choose a model with vibration compensation.
  • Select the right protection class:
    • IP65 for indoor use.
    • IP68 for flooded or outdoor environments.

👉 See also: Portable vs. Wall-Mounted Ultrasonic Flow Meters

5. Output Signals and Compensation

  • Choose outputs based on system integration: 4–20mA analog, pulse, RS485, or HART digital communication.
  • For gases and steam, temperature and pressure compensation is critical:
    • Gases: require both temperature and pressure compensation.
    • Saturated steam: single compensation (temperature or pressure) may be sufficient.

Four Steps to Select the Right Vortex Flow Meter

Step 1: Define Basic Parameters

Gather key data: medium type, composition, operating temperature, pressure, minimum/normal/maximum flow rates, and pipeline size.

Step 2: Initial Selection and Verification

  • Match the medium and conditions with suitable models.
  • Check the Reynolds number: ensure Re > 20,000 at minimum flow for linear performance.
  • For liquids, confirm the working pressure exceeds the saturation vapor pressure at the given temperature (to prevent cavitation).

Step 3: Specify Technical Requirements

  • Material: stainless steel, Hastelloy, or other alloys.
  • Pressure rating: PN16/25/40 or higher.
  • Accuracy: ±1.0% (liquids), ±1.5% (gases/steam).
  • Installation: flange, wafer (clamp), or custom designs.
  • Protection: IP65–IP68 depending on environment.

Step 4: Confirm with Manufacturer or Specialist

For complex conditions such as high viscosity, pulsating flow, or strong vibration, consult the manufacturer. Provide detailed process parameters to receive a tailored recommendation.

Conclusion

Selecting a vortex flow meter is not just about choosing a model—it requires matching the instrument to your process conditions. By considering fluid characteristics, flow range, operating conditions, installation environment, and signal requirements, you can ensure long-term reliability and accuracy. Following the four-step selection process will help you reduce risks, improve efficiency, and achieve precise measurement in your application.

👉 Looking for alternatives? Click to consult the Aister Instrument professional technical team.