The twin rotor flowmeter is a highly accurate volumetric flow measurement instrument. It works by having a pair of specially shaped helical rotors rotate synchronously under the driving force of fluid pressure difference, dividing the fluid into fixed volume units for measurement.

• Extremely high accuracy and repeatability: Due to its non-contact and precise synchronous gear design, it can maintain extremely high accuracy (up to ±0.2% or higher) and repeatability for a long time.
• Extremely low pressure loss: This is a prominent advantage of the double rotor flowmeter. Its smooth helical design offers minimal resistance to the fluid, resulting in pressure loss far lower than that of elliptical gear and waist wheel flowmeters, with excellent energy-saving effects.
• Minimal vibration and low noise: The continuous meshing motion of the helical rotors eliminates periodic impacts like those in elliptical gear flowmeters, ensuring smooth operation with almost no vibration or noise.
• Wide rangeability: The rangeability is very wide, typically up to 20:1 or even 100:1, capable of measuring both large and very small starting flows.
• Long service life: As the core rotating components have no contact wear, the main wear points are the bearings and synchronous gears, resulting in a very long service life.
• Suitable for high-viscosity media: It inherits the advantage of positive displacement flowmeters in providing high measurement accuracy for high-viscosity fluids.

For a clearer understanding, we can make an ultimate comparison among the three:

The dual rotor flowmeter, with its high precision, low pressure drop and low noise characteristics, is often used in extremely demanding situations.

• Petrochemical trade handover: It is one of the preferred flowmeters for crude oil and refined oil trade settlement, especially in long-distance pipelines where energy conservation and low maintenance are required.
• Measurement of high-value chemicals: It is used for precise measurement of expensive chemical raw materials, solvents, etc., to reduce losses.
• Food : It is suitable for applications that require hygiene and low shear force, such as chocolate, syrup, cream, etc.
• Ships: It is used for precise fueling and consumption measurement of ships.
• Any critical process that requires high performance and high reliability measurement.

The dual-rotor flowmeter represents the pinnacle of volumetric flowmeter technology. Through a non-contact helical rotor and synchronous gear design, it perfectly integrates high precision, low pressure loss, low noise and long service life. Although its manufacturing cost is the highest, in fields with extreme requirements for measurement performance, energy efficiency and reliability (such as crude oil trade settlement), it offers an unparalleled solution. The long-term operational benefits it brings often offset its initial high investment.