渦流量計の測定範囲DN32

The measuring range of a DN32 vortex flow meter depends on several factors, including the type of fluid being measured (液体, ガス, or スチーム), the flow meter’s design, and the specific manufacturer’s specifications. Below is a general overview of the measuring range for a DN32 vortex flow meter:

Typical Measuring Range for DN32 Vortex Flow Meters

• For Liquids:
  • Minimum flow rate: ~0.5 to 1 m³/h
  • Maximum flow rate: ~15 to 30 m³/h
• For Gases:
  • Minimum flow rate: ~2 to 5 Nm³/h (normal cubic meters per hour, at standard conditions)
  • Maximum flow rate: ~100 to 200 Nm³/h
• For Steam:
  • Minimum flow rate: ~10 to 20 kg/h
  • Maximum flow rate: ~500 to 1000 kg/h

Factors Affecting the Measuring Range

• Fluid Properties:
  • Density, 粘度, and compressibility of the fluid affect the flow meter’s performance.
  • For gases and steam, temperature and pressure significantly influence the measuring range due to changes in density.
• Flow Meter Design:
  • The shape and size of the vortex shedder (bluff body) and the sensitivity of the sensor impact the flow meter’s rangeability.
• Installation Conditions:
  • Proper installation, including sufficient straight pipe lengths upstream and downstream, ensures accurate measurement across the entire range.

Rangeability (Turndown Ratio)

• Vortex flow meters typically have a rangeability (turndown ratio) of 10:1 に 20:1, meaning the maximum measurable flow rate is 10 に 20 times the minimum flow rate.
  • Example: If the minimum flow rate is 1 m³/h, the maximum flow rate could be 10 に 20 m³/h.

Pressure and Temperature Effects

• For gases and steam, the measuring range is often specified at standard conditions (e.g., 1 atm pressure and 20°C temperature). If the operating pressure or temperature differs, the actual flow range may need to be adjusted using density compensation.
• For liquids, pressure and temperature have a smaller impact on the measuring range.

Key Considerations for Selecting a DN32 Vortex Flow Meter

• Flow Range:
  • Ensure the flow meter’s range covers the minimum and maximum expected flow rates in your application.
• Fluid Type:
  • Confirm the flow meter is suitable for the specific fluid (液体, ガス, or steam).
• Pressure and Temperature:
  • Check the flow meter’s pressure and temperature ratings to ensure compatibility with your operating conditions.
• Accuracy:
  • Typical accuracy for vortex flow meters is ±1% to ±2% of the measured value.
• Output Signals:
  • Ensure the flow meter provides the required output signals (e.g., 4-20 mA, pulse, HART, or Modbus).

The measuring range of a DN32 vortex flow meter typically falls within the following ranges:

• Liquids: 0.5 に 30 m³/h
• Gases: 2 に 200 Nm³/h
• スチーム: 10 に 1000 kg/h

However, the exact range depends on the manufacturer, fluid properties, and operating conditions. Always refer to the manufacturer’s datasheet for precise specifications and ensure the selected flow meter meets your application requirements.