Turbine Flowmeter
Product Overview
A Turbine Flowmeter is a velocity-based flow measurement device used to accurately measure the flow of clean, low- to medium-viscosity liquids and gases. It works by placing a freely rotating turbine rotor in the flow stream; the rotor’s rotational speed is directly proportional to the fluid velocity. Turbine flowmeters are valued for their high accuracy, fast response, and wide measurement range, making them common in industrial process control, oil & gas, chemical, and water applications.
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How it works (simple explanation)
- Fluid flows through the meter and passes over a multi-bladed turbine rotor.
- The flowing fluid causes the rotor to spin at a speed proportional to the flow velocity.
- A pickup sensor (magnetic or Hall-effect) detects the rotation of the rotor blades.
- Each rotation generates a pulse signal.
- The electronics convert pulse frequency into flow rate and total volume.
What it measures
- Volumetric flow rate (e.g., L/min, m³/h, GPM)
- Totalized volume (total flow over time)
- With external temperature and pressure compensation, they can be used to calculate mass flow (especially for gases)
- They are best suited for clean, non-abrasive fluids.
Key advantages
- High accuracy (typically ±0.5% or better)
- Excellent repeatability, ideal for batching and custody-related processes
- Fast response time to flow changes
- Wide flow range and good turndown ratio
- Simple and proven technology
- Compatible with electronic outputs (pulse, 4–20 mA, digital protocols)
Applications
- Oil & gas – fuel measurement, refined products, hydrocarbons
- Chemical processing – solvents, clean chemicals
- Water & utilities – clean water and treated fluids
- Power generation – feedwater and auxiliary systems
- Aviation & aerospace – fuel measurement
- Industrial manufacturing – process liquids and testing systems
Installation
- Install with sufficient straight pipe lengths. Typically, 10–20 pipe diameters upstream and 5 diameters downstream
- Ensure fluid is clean; use filters or strainers upstream
- Avoid air bubbles and cavitation
- Install according to flow direction arrow
- Can be mounted horizontally or vertically (flow upward preferred for liquids)
- Proper grounding and signal wiring for electronic transmitters is essential
Technical Specifications
Parameter | Specification |
Measurement Principle | Turbine (velocity-based) |
Measured Media | Clean liquids, gases |
Flow Range | Wide range; model-dependent (from low flow to high flow) |
Accuracy | ±0.2% to ±1.0% of reading |
Repeatability | ±0.1% or better |
Turndown Ratio | 10:1 to 20:1 (some designs higher) |
Operating Pressure | Up to ~400 bar (model dependent) |
Operating Temperature | –40 °C to +200 °C (materials dependent) |
Output Signals | Pulse/frequency, 4-20 mA, HART, Modbus (optional) |
Pipe Sizes | Typically DN 4 to DN 300 (¼” to 12”) |
Materials | Stainless steel, aluminum, special alloys |
Installation | Inline with straight pipe requirements |