We launched the world's first vortex flowmeter in 1969. Over the next 50 years, long-term stability and high precision have helped to improve customer productivity. The sales results of over 450,000 units are proof of the confidence of the YEWFLO series.
digitalYEWFLO is Yokogawa's line of vortex flowmeters with excellent reliability and performance. The stability of digitalYEWFLO's field-proven sensors when combined with its unique signal processing technology results in excellent real-world performance. digitalYEWFLO offers a wide product range to meet all customer requirements.
|Standard Type||Reduced Bore Type||Multi-Variable Type||High Process Temperature Version / Cryogenic Version|
|Main application destination||Flow measurement of liquid, gas and steam||Line with large flow rate fluctuation by season||Mass flow measurement of saturated steam||Flow measurement of high temperature oil and LNG|
|Applicable fluid temperature range||-29 to 250 °C||-29 to 250 °C||-29 to 250 °C||-29 to 450 °C
(High Process Temperature Version)
-196 to 100 °C
|Diameter||Wafer||15 to 100 mm||None||25 to 100 mm||15 to 100 mm|
|Flange||15 to 400 mm||25 to 200 mm
(Detector size: 15 to 150 mm)
40 ～ 200 mm
(Detector size: 15 to 100 mm)
|25 to 200 mm
(Custom specification: 250 to 400 mm)
|15 to 400 mm|
|Accuracy||liquid||± 0.75 % of reading||± 1.0 % of reading||± 0.75 % of reading|
|Gas and steam||± 1.0 % of reading|
Yokogawa's vortex flow meters are long-lasting and robust, offering field-proven sensor technology and high reliability to deliver improvements in plant efficiency and reduce OPEX.
FlowNavigator (FSA120) is a unique software tool that helps you get the most out of the EJX910A / EJX930A Multivariable Transmitter by supporting the configuration of the discharge coefficient, primary device bore, upstream internal pipe diameter, gas expansion factor, density, and viscosity data needed to perform full compensation and dynamic calculation of the mass flow.
Progress in digital signal processing and network technologies has enabled advanced functions which cannot be achieved by traditional field devices with 4-20 mA signal, to be implemented on field devices. Standardization of international fieldbus specifications, notably the FOUNDATION™ Fieldbus, has enabled users to build optimum field networks comprised of freely chosen field devices from various device vendors.
Vortex flow meters have been appreciated by users as volume flow meters, which can, in principle, be applied to any flow measurement of liquid, gas, or steam. Volume flow measurement is enough for substances with small variations in density such as liquid.
The operating principle of the vortex flow meters YEWFLO series, which first became commercially available in 1979, is based on the phenomenon in which the frequency of a Kàrmàn vortex train that occurs from a vortex shedder placed in a fluid flow, is proportional to the speed of that flow.
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