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Yokogawa Vortex Flow Meter: DigitalYEWFLO Saturated Steam System Manuals and Replacement Data
Quick Answer: The DigitalYEWFLO vortex flow meter measures saturated steam velocity. Pressure and temperature compensation turns velocity into mass flow in kg/h. The system manual covers K-factor entry, steam density settings, low flow cut-off, and HART wiring. If you need a cross reference or a new vortex meter, send your pipe size, steam pressure, and flow range to Silver Automation Instruments.
What the Yokogawa Manual Covers for Saturated Steam
The manual set for a Yokogawa DigitalYEWFLO meter usually includes installation drawings, wiring diagrams, parameter codes, and troubleshooting steps. For saturated steam, the most useful sections are the K-factor configuration, the process temperature limits, and the wiring examples for a HART loop. A typical DY series meter stores the K-factor on a nameplate. In practice, this value must match the transmitter parameter. A small typing error changes the flow reading by more than 5 percent.
But most engineers skip the steam density table. That is a mistake. Saturated steam density changes a lot between 3 bar g and 12 bar g. At 3 bar g, saturated steam temperature is about 144 °C. At 12 bar g, the temperature is about 192 °C. A fixed density setting only works if the steam pressure stays stable. If your boiler pressure swings, use a pressure transmitter or an integrated pressure input.
Field Issues We See on Saturated Steam Flow Meters
Here is the thing. A vortex meter on saturated steam works best when steam quality is above 95 percent. Lower quality causes droplet noise and unstable readings. A food processing plant in Vietnam had a DN50 steam line at 6 bar g. The flow meter total did not match the boiler feed water volume. The cause was wet steam during morning startup. The vortex sensor interpreted water droplets as high velocity. The mass flow total ran 18 percent high until the steam quality recovered.
Another example comes from a textile mill in Bangladesh. The customer used the wrong pipe inner diameter for the K-factor calculation. The meter was installed in DN100 Sch 80 pipe but the manual data used Sch 40 dimensions. The inner diameter difference was only 5 mm. That small gap caused a 9 percent error in total steam flow. Before you replace a Yokogawa DigitalYEWFLO meter, confirm the actual pipe schedule.
Silver Instruments Vortex Meter for Saturated Steam
Silver Automation Instruments supplies vortex flow meters for satura
For saturated steam up to 350 °C, we recommend the integrated temperature and pressure compensation version. This model outputs mass flow in kg/h directly. It also gives a pulse output for total flow. The wiring is close to a Yokogawa DigitalYEWFLO installation. You can keep the same 24 V DC loop and HART handheld communicator.
Cross Reference and Quotation Data
Do not start with a general price request. We need four values to select the right meter. Steam pressure in bar g or steam temperature in °C. Pipe size and schedule such as DN80 Sch 40. Minimum and maximum flow in kg/h or t/h. Required output signal such as 4-20 mA HART, pulse, or Modbus RTU. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will return a model code, a price, and a data sheet within one business day.
Contact Silver Automation Instruments
Tel: +86-135-1213-1526. Whatsapp: 86-135-12131526. WeChat: +86 13512131526. Website: flow-meter.com.au. For technical selection or a replacement quote, send the four values above and the existing Yokogawa model code if available.
FAQ
Can a Silver Instruments vortex meter replace a Yokogawa DigitalYEWFLO on saturated steam?
Yes. In many cases the flange size and wiring match. Send the existing model code and we will confirm the cross reference.
What accuracy do you quote for saturated steam?
For steam above 5 m/s, typical accuracy is 1.5 percent of reading for mass flow. Below 5 m/s, the low flow cut-off starts to influence the result.
Do I need pressure compensation for saturated steam?
Yes if the pressure changes more than 10 percent. If the pressure is stable, a fixed density value is enough.
Can the meter handle wet steam?
Wet steam with quality below 95 percent creates noise. A vortex meter is not recommended for wet steam. Install a steam separator before the meter if quality is uncertain.
What output options are available?
4-20 mA HART, pulse, and Modbus RTU. Most customers choose 4-20 mA HART with a local display.
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