How it works
The vortex flowmeter operates based on the principle of the Kármán vortex street. When fluid flows past an obstruction in the pipeline (such as a triangular prism), vortices are alternately generated on both downstream sides, forming a regular vortex street. The vortex frequency (f) is proportional to the flow velocity (v), with the relationship given by f = St·v/d (where St is the Strouhal number and d is the width of the obstruction). The sensor (such as a piezoelectric element) detects the vortex frequency and converts it into an electrical signal, which is then used to calculate the flow rate Q = f/K through the instrument coefficient K (determined by calibration). This flowmeter is suitable for gases, steam, and liquids.
Key features
• SSP (Spectrum Signal Processing) Technology: SSP is integrated into DY's powerful electronic components. By analyzing the fluid conditions within DY, SSP automatically optimizes the application using the data, achieving functionalities never realized by traditional vortex flowmeters. SSP can accurately detect vortices in low flow ranges, providing excellent flow stability.
• Self-Diagnosis Function: Can predict and display the status of the application, such as significant pipeline vibrations or pulsating flows.
• High Accuracy: ±0.75% of reading (liquid), ±1% of reading (gas, steam)
• Wide Process Temperature Range: High-temperature type up to 450°C, low-temperature type down to -196°C
• Easy Parameter Setting: Commonly used options can be combined for quick access, reducing commissioning time.
• Clear Display: Can simultaneously display process diagnostics along with instantaneous flow or temperature (optional: /MV) and totalized flow, which is very convenient.
• Dual Analog/Pulse Output: Can output flow or temperature (optional: /MV) and pulse simultaneously.
• Alarm Output, Status Output (Flow Switch): Provides an alarm signal output when an alarm occurs.
• Stainless Steel Detector without Moving Parts: Durable and safe.
• Signal Cable Length Up to 30 m.
• Explosion-Proof Construction: NEPSI.
Typical applications
The digital YEWFLO vortex flowmeter combines in-situ verification sensors and body components, utilizing a unique and powerful combination of digital technologies in over 450,000 installed units, including Spectral Signal Processing (SSP)—an innovation by Yokogawa. Even under harsh process conditions, the digital YEWFLO vortex flowmeter maintains accuracy and stability, offering high reliability. Its robust design enhances plant efficiency and reduces operating costs.
