digitalYEWFLO Multivariable Vortex Flow Meter

Yokogawa’s digitalYEWFLO Multivariable Vortex Flow Meter can measure flow rate and temperature simultaneously, eliminating the need for separate components and associated installation costs. The embedded temperature sensor inside the shedder bar directly outputs the mass flow rate of saturated steam and computes the flow rate in real time based on the measured temperature.

Our multivariable vortex flow meter features:

  • Embedded temperature sensor
  • Built-in steam tables
  • Self-diagnostics functions
  • Simultaneous displays of mass flow rate and temperature on two-line LCD indicator

Features

Embedded Temperature Sensor

With the digitalYEWFLO multivariable type vortex flow meter, there is no need for an external temperature sensor or the insertion hole in a pipe. An embedded Pt1000 RTD sensor extends the application of digitalYEWFLO to include the mass flow of saturated steam, gas, and liquids.

Built-in Steam Tables

Built-in steam tables provide temperature references for pressure based on the saturated steam conditions. With these steam tables, the measured temperature defines the steam pressure, and the temperature and pressure define the steam density. The mass flow rate is calculated by combining the steam density and volumetric flow rate.

With its Spectral Signal Processing system, the digitalYEWFLO is able to accurately measure fluctuations in temperature.

embedded temperature sensor

Advanced Self-Diagnostics

The LCD indicator provides messages to alert the operator if the temperature is outside the set range or if there is a temperature sensor fault, so necessary actions can be taken to prevent inaccurate measurements.

Simultaneous Displays of Mass Flow Rate and Temperature

The multivariable vortex flow meter displays mass flow rate and temperature on the two-line LCD indicator, providing simultaneous outputs for temperature monitoring and mass flow measurement. The LCD indicator also features user-selectable flow, temperature, total and other display parameters.

Durability

Applications

Steam Flow Measurement

Steam has often been described as the 'lifeblood' of the industry. The multivariable vortex flow meter is the perfect solution for steam flow measurement due to its embedded temperature sensor, built-in steam tables, inherent linear measurement, large turndown, low pressure drop, and high accuracy. The multivariable vortex flow meter eliminates the need for separate components and associated installation temperature elements. In addition, it provides quality, dependability and high pressure ratings along with a stable and reliable flow measurement.

 

How Multivariable Flow Meters Work

Saturated Steam Measurement Mechanism

A steam table provides data on the temperature, pressure and density of steam and is provided by a certification body such as ASME (American Society of Mechanical Engineers). The saturated steam curve shows the steam saturation point for each pressure/temperature level. The digitalYEWFLO converter calculates the mass flow rate using the density figure from the steam table. With its Spectral Signal Processing system, the digitalYEWFLO is able to accurately measure fluctuations in temperature. With superheated steam, density is calculated as a fixed pressure value that includes the superheated temperature value.

Overview:

Medir el consumo de energía es un factor importante en la búsqueda de mejorar la eficiencia energética. La medición eficiente y precisa es fundamental para determinar el exceso de uso, junto con una imagen exacta en dónde se usa el vapor. Las mediciones más precisas y confiables que se realizan, las decisiones más informadas pueden ser tomadas afectando los costos y la calidad del producto. Tradicionalmente, el método más común de medición de vapor es la placa de orificios y la técnica de medición de presión diferencial. Las áreas generales de preocupación con este tipo de medición son la susceptibilidad de la placa de orificios para introducir errores inmediatos, las relativamente permanente pérdidas de presión alta introducidas en el sistema por el orificio y el rango de medida pequeña, por lo general típicamente es 3:1.

El digitalYEWFLO con Diámetro Reducido Tipo Medidor de Flujo Vortex Modelo de Yokogawa cuenta con una estructura de acero inoxidable fundido y un reductor concéntrico y de expansión que permite realizar unas mediciones de flujo estables en condiciones de bajo flujo. Esto amplía la gama de mediciones que se pueden realizar, desde las velocidades de flujo más altas hasta el extremo inferior del intervalo de flujo, que normalmente es difícil para los medidores de flujo Vortex, y asegura una salida de velocidad de flujo estable y exacta.

Overview:

Vortex flow meters utilize a fluid phenomenon in which frequencies of Karman vortex streets released from a shedder bar inserted in a flow are proportional to flow velocities.

Yokogawa Technical Report
Overview:

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.

Yokogawa Technical Report
Overview:

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. 

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