Vortex Flow Meter

FlowT Instrument (Shenzhen) Limited | Vortex Flow Meter for Steam, Gas & Liquids

FlowT supplies industrial vortex flow meters for measuring steam, gases and suitable low-viscosity liquids in process pipelines. Based on the vortex shedding principle, these instruments support flow monitoring in steam distribution networks, compressed air systems, manufacturing facilities and industrial utility applications.Whether you are selecting a flow meter for a new installation, replacing an existing instrument or sourcing equipment for a larger project, FlowT can help you review the required flow range, pipe size, operating temperature, pressure and signal output.
Our vortex flow meter solutions are intended for engineering buyers, EPC contractors, OEM equipment manufacturers and industrial distributors seeking technical clarity, suitable product configurations and factory-direct quotation support.

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Why Choose a Vortex Flow Meter Manufacturer?

01/

Leading Service
We are committed to constantly innovating our products to provide foreign customers with a large number of high-quality products to exceed customer satisfaction. We can also provide customized services according to customers' requirements such as size, color, appearance, etc. We can provide the most favorable price and high-quality products.

02/

Quality Guaranteed
We have been continuously researching and innovating to meet the needs of different customers. At the same time, we always adhere to strict quality control to ensure that the quality of every product meets international standards.

03/

Wide Sales Countries
Our products have been exported to more than 40 countries, such as Russia, Australia, USA, UK, Germany, Ukraine, Iran, Romania, Hungary, Mexico, Brazil, Chile, Canada, Spain, Colombia, etc. We have agents in the USA, Australia, Singapore, Kuwait, Russia.

04/

Various Types of Products
Our products include a wide range of flow meter like Ultrasonic Flow Meter，Electromagnetic Flow Meter, Vortex Flow Meter, Thermal Mass Flow Meter, Turbine Flow Meter, Liquid Level Flow Meter, Gear Flow Meter, Totalizer Flow Meter and so on.

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What is an Vortex Flow Meter?

A vortex flow meter measures fluid velocity by detecting the frequency of vortices formed as the fluid passes a bluff body inside the measuring pipe. Within the instrument's qualified measuring range, the vortex shedding frequency is proportional to flow velocity, allowing the transmitter to calculate volumetric flow.

Unlike rotating mechanical flow meters, vortex flow meters do not require a moving impeller in the measuring mechanism. This makes vortex technology a practical option for suitable industrial applications where mechanical wear, maintenance requirements and continuous operation are important considerations.

FlowT vortex flow meters are intended for industrial measurement applications involving compatible steam, gases and low-viscosity liquids. Common applications include boiler steam distribution, compressed air pipelines, utility monitoring and selected process-fluid measurement systems.

For steam and gas applications, changes in operating temperature and pressure must also be considered when mass flow or standardized volume is required. Depending on the selected instrument and compensation arrangement, additional temperature and pressure information may be used to calculate fluid density.

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Why Choose FlowT Vortex Flow Meters?

These vortex flow meters are highly versatile, capable of effectively measuring the flow of liquid, gas, or steam. This adaptability makes them invaluable in diverse industrial settings.

Flow Measurement Without Moving Parts

Vortex flow meters use the frequency of vortices generated behind a bluff body to determine fluid velocity. The measuring mechanism does not depend on rotating components, helping reduce mechanical wear associated with impeller-based designs. For industrial facilities operating continuous production processes, this measuring principle can reduce certain maintenance concerns while supporting routine flow monitoring when the instrument is properly selected and installed.

Steam Measurement with Compensation Options

Accurate steam consumption monitoring requires more than measuring volumetric flow. Changes in pressure and temperature affect steam density, which must be considered when calculating mass flow. For compatible configurations, temperature and pressure measurements can support density compensation. FlowT can help customers review the appropriate measurement arrangement for saturated or superheated steam applications.

Independence from temperature and pressure fluctuations

Vortex flow meters can measure flow rates independently of temperature and pressure fluctuations within the system. They provide consistent and reliable data even in dynamic conditions. No conductivity requirement Unlike some flow measurement technologies, vortex meters do not require a specific level of conductivity in the flow media. This makes them a great solution for deionized water systems.

Configurations for Different Piping Requirements

Industrial piping systems vary in diameter, pressure rating, process connection and installation layout. Selecting a suitable vortex flow meter requires matching these conditions to the instrument's specifications. FlowT works with customers to review available product configurations and connection requirements, helping engineers reduce the risk of ordering an instrument that does not fit the intended installation.

Integration with Industrial Control Systems

Flow measurement data often needs to be transmitted to a PLC, DCS or other industrial monitoring platform. Depending on the transmitter configuration, industrial vortex flow meters may provide analog, pulse or digital communication outputs. FlowT can review the required signal type, power supply and system interface so customers can identify compatible product options before purchasing.

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Maintenance of vortex flow meter

During the installation and connection process, the vortex flow meter should ensure the accuracy of each link, and it is necessary to ensure the safety control of the instrument wiring and system grounding wire during the site inspection and installation process. Real data is detected and can be output accurately.

For the metering system in operation, the method of “confirmation of glass tube level gauge” and “alternative method” can be used to confirm and eliminate the faults of the meter in operation.

Regularly clean the vortex flow meter as a whole, and if necessary, purge the sensing head of the vortex flow meter to avoid condensation of impurities at the sensor head. In the cold season, the addition of a heat tracing device to the metering straight pipe section and the meter section is also advantageous for alleviating the condensation of impurities at the metering gauge.

Drain the pipeline regularly, especially the water before the straight pipe section. Regularly set the discharge according to the specific conditions, reduce the moisture in the measuring pipe section as much as possible, and eliminate the pulsation in the fluid to the utmost extent.

Strengthen the management of the integrated vortex flow meter measurement system data, set the timing printing function, and analyze the operation of the instrument based on the print data combined with the production status.

How Does a Vortex Flow Meter Work?

The vortex flow meter operating principle is the Von Kármán effect. When a fluid flows around an obstacle, it creates a series of alternating vortices, or swirling eddies. The phenomenon is also called the Von Kármán vortex street.

The meter uses this principle to predict the pattern of these vortices using the the Von Kármán. From there, it can calculate the flow rate from the vortex frequency.

The output signal of the meter is a low voltage signal proportional to the vortex frequency. It then converts to volumetric flow rate. That's the volume of fluid that flows through the system over time.

This method can also calculate the mass flow rate if the density of the fluid is a known constant. The vortex frequency across the meter can be measured by a variety of sensors, which will be discussed below.

Common Challenges in Industrial Flow Measurement

Inaccurate Readings at Low Flow Rates

Industrial flow demand can change significantly during normal operation. A meter selected only for the maximum flow may not provide reliable measurement when actual flow falls below the instrument's minimum operating range.

FlowT recommends reviewing minimum, normal and maximum flow conditions before selecting a vortex flow meter. Proper sizing helps customers determine whether vortex technology is suitable for the required operating range.

Changes in Steam Temperature and Pressure

Steam density varies with operating conditions, which can affect the calculation of mass consumption. A volumetric measurement alone may not provide the information required for steam mass-flow monitoring.

FlowT can review the available temperature and pressure compensation arrangements for applicable models and help customers identify the measurement configuration needed for their steam application.

Installation Conditions Affect Measurement Performance

Pipe elbows, control valves, reducers and other disturbances may affect the flow profile entering a vortex flow meter. Excessive vibration and insufficient straight pipe length can also influence signal quality.

By reviewing the installation arrangement before ordering, customers can identify potential restrictions and compare them with the requirements of the selected instrument.

Incomplete Technical Information Delays Procurement

Industrial equipment purchases often require more than a price quotation. Engineering teams may need dimensional drawings, accuracy specifications, electrical information and installation instructions before approving a meter.

FlowT encourages customers to identify required technical documents during model selection so the engineering and purchasing teams can review the same product configuration.

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Common Vortex Flow Meters Types

There are many types of vortex flow meters. Below, we will discuss some of the common options.

Piezoelectric sensor

Piezoelectric materials naturally produce a small electrical charge when they experience mechanical pressure. These materials are often used in sensors that measure a measurable mechanical stress. If the vortices created within the meter are strong enough, they produce a mechanical stress that the sensor can measure. The piezo element used in sensors is usually a ceramic component.

Capacitance sensor

This sensor uses two probes on opposite walls of the pipe. They calculate flow rate based on the positive and negative pressure the vortices generate across the probes.

Ultrasonic sensor

This type of sensor emits a signal from a transducer in one wall of the pipe that bounces across the pipe and is measured by a second transducer. The number of vortices will slow the signal and that time variation can be measured to calculate the flow.

Integrated temperature sensor

In addition to measuring the flow rate, some flow meters can also provide temperature readings. These sensors are usually built into the shedder bar to avoid any disruption to the vortices.

What to Consider When Choosing Vortex Flow Meter

Measurement Medium And Conditions
Medium type: The vortex flow meter is mainly used to measure the volume flow rate of gas, steam or liquid, the volume flow rate of standard conditions or the mass flow rate.

Medium flow rate
The full-scale flow rate of the vortex flow meter can be selected within the range of 0.5-12m/s for the measured medium flow rate. When the pipeline flow rate is low and cannot meet the requirements of the flow meter or the measurement accuracy cannot be guaranteed at this flow rate, it is necessary to reduce the instrument caliber to increase the flow rate in the pipe and obtain satisfactory measurement results.

Temperature range
The vortex flow meter can operate in the operating temperature range of -20℃ to +250℃.

Instrument type and specifications
Instrument type: Depending on the measurement medium, different types of vortex flow meters can be selected, such as the LUB series intelligent vortex flow meter, the HSC vortex flow meter series, the HZB vortex flow meter series, etc.

Instrument specifications (caliber)
When selecting instrument specifications (caliber), it is not necessarily the same as the process pipeline. It should be determined whether the measurement flow range is within the flow rate range.

Pressure and temperature compensation
Pressure compensation: Since the saturated steam pipeline is long and the pressure fluctuation is large, pressure compensation must be used. According to the saturated steam pressure range of the pipeline, select the appropriate pressure transmitter range.

Temperature compensation
The selection of vortex flow meter also needs to consider the temperature range of the measuring medium to ensure measurement accuracy.

Accuracy and functional requirements
Accuracy level: Select the instrument accuracy level according to the measurement requirements and the occasion of use. For example, for occasions such as trade settlement, product handover and energy metering, a vortex flow meter with a higher accuracy level should be selected.

Functional requirements: Depending on whether remote monitoring, data transmission and other functions are required, select a vortex flowmeter with corresponding functions.

Cost and maintenance
Cost: Consider the purchase cost of the vortex flow meter, as well as the cost of subsequent installation, commissioning and maintenance.

Maintenance: Select a vortex flow meter with a simple structure, high reliability and low maintenance to reduce maintenance costs.

Flow Range
Determine the expected flow range for your application. Vortex flow meters have a specified flow range within which they provide accurate measurements. Ensure that the flow range of the vortex flow meter aligns with your application requirements, including both minimum and maximum flow rates.

Fluid Compatibility
Consider the compatibility of the vortex flow meter with the fluid being measured. Vortex flow meters are suitable for a wide range of fluids, but certain materials or fluid prop0erties may require specific options. Verify that the flow meter is constructed from materials that are compatible with the fluid's temperature, pressure, and chemical composition.

Pipe Size and Connection
Select a vortex flow meter that matches the pipe size of your installation. The flow meter's connection should align with the pipe's flange or thread type. Ensure that the flow meter is available in the appropriate pipe sizes and connection options for easy installation and compatibility with your piping system.

Accuracy and Turndown Ratio
Consider the accuracy requirements of your application. Vortex flow meters typically have a specified accuracy level, expressed as a percentage of the measured flow rate. Additionally, evaluate the turndown ratio, which indicates the flow range over which the flow meter can provide accurate measurements. Choose a vortex flow meter with the required accuracy and turndown ratio for your specific application.

Temperature and Pressure Ratings
Evaluate the temperature and pressure conditions of your application. Vortex flow meters have temperature and pressure ratings that indicate their operating limits. Ensure that the selected flow meter can handle the temperature and pressure ranges of your fluid and system to prevent any damage or inaccuracies.

Installation and Mounting Requirements
Consider the installation and mounting requirements of the vortex flow meter. Determine if the flow meter can be installed in the desired orientation (horizontal or vertical) and if any specific mounting considerations are necessary. Additionally, check if there are any upstream or downstream straight pipe requirements to ensure accurate flow measurement.

Vortex Flow Meter vs. Other Flow Meter Technologies

Different flow measurement technologies are designed for different operating conditions. Selecting the right instrument requires evaluating the medium, expected flow range, measurement objective, installation requirements and maintenance considerations.

Flow Meter Type	Typical Applications	Key Selection Considerations
Vortex Flow Meter	Steam, suitable gases and low-viscosity liquids	Requires adequate flow velocity and suitable installation conditions
Turbine Flow Meter	Clean liquids and selected gas applications	Rotating components require consideration of wear and fluid cleanliness
Differential Pressure Flow Meter	Steam, liquids and gases	Requires a primary element and pressure measurement arrangement
Electromagnetic Flow Meter	Electrically conductive liquids	Not suitable for steam, gases or nonconductive liquids
Thermal Mass Flow Meter	Gas flow measurement	Performance depends on gas properties and calibration conditions
Ultrasonic Flow Meter	Liquid or gas applications depending on technology	Requires suitable acoustic and installation conditions

Vortex Flow Meter Technical Specifications

FlowT vortex flow meters are selected according to the measured medium, operating flow, pipe diameter, pressure, temperature and required electrical interface. The specifications below describe the principal selection factors. Exact operating limits and performance values depend on the selected model.

Parameter	Technical Description
Product Name	Industrial Vortex Flow Meter
Brand	FlowT
Measurement Principle	Vortex shedding
Applicable Media	Steam, suitable industrial gases and low-viscosity liquids
Primary Measurement	Volumetric flow
Mass Flow	Calculated using appropriate density information where supported
Nominal Pipe Size	Selected according to the available model range and pipeline dimensions
Measuring Range	Determined by nominal diameter, fluid properties and operating conditions
Accuracy	Refer to the selected model's verified accuracy specification
Repeatability	Model-specific performance specification
Operating Temperature	Depends on sensor construction and transmitter configuration
Operating Pressure	Determined by the selected body and process connection rating
Wetted Materials	Selected according to product construction and fluid compatibility
Process Connections	Model-specific connection types and dimensional standards
Electrical Supply	According to the selected transmitter
Signal Output	Available analog, pulse or digital interfaces, depending on model
Temperature Compensation	According to the selected measurement configuration
Pressure Compensation	According to the selected measurement configuration
Protection Rating	According to the transmitter housing specification
Installation Requirements	Model-specific straight pipe lengths, orientation and mounting conditions
Technical Documentation	Applicable datasheet, drawings and installation instructions

FAQ

Q: How accurate is the vortex flow meter?

A: This meter offers a 1.25% of rate accuracy when measuring the mass flow of liquids and a 2% of rate accuracy for gases and steam.

Q: How to work a vortex flow meter?

A: Vortex flow meters work by placing a strategic obstruction in the path of the flowing media. This obstruction is commonly called a bluff body. As the gas or liquid passes by, vortices are created. They form on either side and break away in an alternating pattern.

Q: What is the straight run for a vortex flow meter?

A: The desired upstream straight pipe length is 1000mm. Downstream: allow a minimum straight pipe length at least 5 times the internal diameter of the pipe. For example, with the 50mm pipe, there should be 250mm of straight pipe immediately upstream. The desired upstream straight pipe length is 500mm.

Q: What is the maximum velocity of a vortex flow meter?

A: On low viscosity products such as water, gasoline, and liquid ammonia, and with application maximum velocity of 15 ft/s (4.6 m/s), vortex shedding meters can have a rangeability of about 20:1 with a pressure loss of approximately 4 PSIG (27.4 kPa).

Q: What are the upstream and downstream requirements for a vortex flow meter?

A: Per the vendor manual, the vortex flow meter requires a straight run of 30 pipe diameters (D) upstream and 5 D downstream, and the two inner diameters are slightly different (54 mm for the pipe and 51 mm for the meter).

Q: What is the pressure drop on a vortex flow meter?

A: The pressure drop produced by a vortex flow meter is about 2 velocity heads (v2/2g), and because the pressure drop rises with the square of velocity, therefore the ΔP of an 8-in. meter would be 2.5 times, and for a 6-in. meter it would be 7.5 times the ΔP you are experiencing today in your 10-in.

Q: What are the advantages of a vortex flow meter?

A: Vortex flow meters offer many advantages for flow measurement including easy installation without impulse lines, no moving parts to maintain or repair, less leak potential and a wide flow turndown range. Vortex meters also offer very low power consumption, allowing for use in remote areas.

Q: What are the two types of vortex flow?

A: There are two fundamental types of vortex flow, and they are distinguished by whether the flow is rotational or irrotational. If the particles of fluid moving in these concentric circles do not rotate on their own axes, the flow is irrotational and the vortex is known as an irrotational flow vortex or as a free vortex.

Q: What is the minimum flow rate for vortex flow meter?

A: For atmospheric gas, the lower limit the flow rate of the vortex flow meter can reach 4~5m/s. For pressurized gas, such as compressed air, due to the increase in density, the lower limit flow rate will decrease. Therefore, in the selection, the actual working condition flow must be considered.

Q: What is the low flow cut off on a vortex flow meter?

A: On your second question, if the flow drops below 4 m³/hr, the reading will drop to zero. This is called “low-flow cutoff.” A vortex meter requires the flow to be in the turbulent flow regime to function correctly.

Q: What are the working principles of vortex flow meter?

A: Vortex flow meters operate under the vortex shedding principle, where an oscillating vortexes occur when a fluid such as water flow past a bluff (as opposed to streamlined) body. The frequency that the vortexes are shed depend on the size and shape of the body.

Q: How accurate is the vortex flow meter?

A: The accuracy of the vortex flow meter is approximately ±0.5%R～±2%R for liquids and ±1%R～±2%R for gases, and the repeatability is generally 0.2%～0.5%.

Q: What is the turndown of a vortex flow meter?

A: The turndown ratio (i.e. the ratio of maximum flow rate to minimum flow rate) of most vortex meters will be somewhere between 10 and 15, depending on the viscosity of the fluid being metered.

Q: What is the minimum Reynolds number for vortex flow meter?

A: Fully developed turbulent flow requires a Reynolds Number of about 10,000 which is a best practice lower limit for vortex flow meters.

Q: What is the output signal of a vortex flow meter?

A: The fluid strikes a bluff body, imparting alternating vortices downstream of the bluff. This creates a pressure on a sensor body containing a piezoelectric crystal. The frequency of the sensor is proportional to the velocity of the fluid and is amplified and converted to a 4 to 20 mA output signal.

Need Help Selecting the Right Vortex Flow Meter?

Choosing the right flow meter begins with understanding your process conditions. FlowT can help you review suitable vortex flow meter configurations for steam, gas and liquid measurement applications.

Whether you are purchasing a single instrument for an industrial installation, preparing an EPC project or sourcing flow meters for OEM equipment, our team can discuss the relevant technical specifications, documentation and purchasing requirements.

Send us your application details to begin your product selection and quotation process.

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