History of Our Vortex Flowmeter
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 Series" Product Introduction
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|
Measuring energy consumption is an important factor in the quest to improve energy efficiency. Efficient and accurate metering is paramount to determining excess use, along with an accurate picture of where the steam is being used. The more accurate and reliable measurements that are made, the more informed decisions can be taken that affect costs and product quality. Traditionally the most common method of steam metering is the orifice plate and differential pressure transmitter technique. General areas of concern with this type of measurement are the orifice plate's susceptibility to wear introducing immediate inaccuracies, the relatively high permanent pressure losses introduced into the system by the orifice place and the small measuring range, typically 3:1.
Yokogawa's digitalYEWFLO Reduced Bore Type Vortex Flow meter features a cast stainless steel body and a concentric reducer and expander that enable stable flow rate measurements in low-flow conditions. This expands the range of measurements that can be performed, from the higher flow rates down to the lower end of the flow span, which is normally difficult for Vortex Flow meters, and ensures stable and accurate flow rate output.
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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