About YOKOGAWA's Flowmeters
A flowmeter is a measuring instrument that measures the amount of liquid, gas, steam, powder, or a mixture of these substances flowing through a pipe or ditch. Various measurement methods are available depending on the purpose of measurement, the type and condition of the fluid, and the measurement conditions such as the measurement location. We offer Coriolis, electromagnetic, vortex, and variable area flowmeters.
Coriolis Mass Flow and Density Meters
The Coriolis type measurement principle applies the law that the Coriolis force generated when a fluid flows through a measuring tube (U-tube) is proportional to the mass flow rate through that tube. Our Coriolis mass flowmeters are characterized by their wide lineup and high accuracy over a wide range of flow rates. This multivariable flowmeter can simultaneously measure not only mass flow but also density and temperature, and can also be used as a volumetric flowmeter and concentration meter. No straight pipe length is required in front of or behind the flowmeter for installation.
The principle of electromagnetic measurement is based on Faraday's law of electromagnetic induction, in which an electromotive force is generated in proportion to the flow velocity when a conductive fluid crosses a magnetic field. Our electromagnetic flowmeter has no pressure drop and can measure a wide variety of liquids. Various lining materials (PFA, PTFE, ceramics, polyurethane rubber, natural soft rubber, natural hard rubber) and our unique dual frequency excitation method ensure stable flow measurement even with corrosive or slurry fluids. The bore size ranges from 2.5 mm to 1800 mm. The capacitive electromagnetic flowmeter is suitable for measuring low conductivity and high concentration slurry fluids.
The measuring principle of vortex type is that the frequency of the Karman vortex generated behind a columnar object in the flow is proportional to the flow velocity. Liquid, gas, and steam can be measured. Compared to throttle flowmeters, our vortex flowmeters have a simple structure, wide rangeability, and cost advantages. Our vortex flowmeters have a unique sensing structure that integrates a vortex shedder bar and vortex sensing sensor, and our proprietary signal processing technology, which enables stable flow measurement over a long period of time from high-temperature fluid to cryogenic fluids. The reducer type with integrated reducer (shrinking and expanding tubes) is suitable for lines with large seasonal flow fluctuations, such as steam supply lines. The multivariable type with a temperature sensor built into the vortex shedder bar is also suitable for steam measurement.
Variable Area Flowmeters
The measurement principle of the variable area type is that the position of the float in the tapered tube is proportional to the flow rate. This simple measurement format has a long history as a field indicator. Our ROTAMETER has become synonymous with variable area type flowmeters. Available in glass and metal tubes, it can measure a wide range of fluids from gases to corrosive liquids.
Yokogawa has more than 70 years experience in the development, design, and manufacture of various flow meter technologies. With many industry firsts, Yokogawa continues to lead innovation in flow measurement.
Flowmeter Product Family
We have a wide lineup of flowmeter products with various measurement methods. You can select the best flowmeter for your flow measurement purpose (volume flow / mass flow / temperature / density), fluid type (liquid / gas / steam), and fluid condition (temperature / pressure / corrosive / slurry / viscosity).
● = best choice; ○ = possible; - = not applicable
|Coriolis||Magnetic||Vortex Flowmeter||Variable Area/Rotameter|
|ADMAG Total Insight
|Rotameter Glass||Rotameter Metal|
|Abrasive / Slurry||○||●||-||-||-|
|Properties||Low pressure loss||-||●||●||-||-|
|Accuracy||± 0.1 % of rate||± 0.15 % of rate||± 0.75 % of rate||1.6 % (qG = 50 %)||1.6 % (qG = 50 %)|
|Maximum diameter||200 mm||1,800 mm||400 mm||2 1/2 inch||150 mm|
ROTAMASS is the integral and remote type Coriolis Mass Flow Meter. Both types have highly refined digital signal processing electronics, so that accurate and stable mass flow measurement is achieved.
Yokogawa's experience with magnetic flowmeters spans decades. Our magnetic flow meters provide flexible configurations for industrial use in most areas.
Yokogawa has been synonymous with Vortex flowmeters since pioneering the industrial Vortex flowmeters from 1969. Even since then, Yokogawa has continued to be at the fore front of vortex technology; so, today, Yokogawa offers a large variety of Vortex flowmeters, including custom made designs.
The Variable Area Flowmeter is one of the oldest and mature principles in flow measurement with its simple design: a float rises inside a conically shaped glass tube as the flow increases and its position on a scale can be read off as the flow rate. Since this measuring method is purely mechanic, it as simple as it is reliable.
Magnetic Flowmeter dual frequency excitation provides immunity to slurry noise by good stability and accuracy, determining the maintenance timing can be recognized by monitoring of electrodes.
The Coriolis flow meter has many features such as direct measurement of mass flow and measurement of fluid density, which other flow meters do not support. Therefore, since being introduced for practical use in the late 1970s, its market has rapidly expanded in many industries such as oil, chemicals, and foods.
Vortex flow meters were put into practical use in the 1970's; thus their history is relatively short. They have been mainly used at petrochemical plants because of their two main features, the fact that they do not have any mechanical moving parts and are maintenance-free. Yokogawa started research and development on the vortex flow meter before 1970.
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