Uniquely designed for easy installation, reduced maintenance and superior reliability in gas, liquid and steam flows. 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. Additionally, Vortex meters are unique in that they can accommodate liquids, gasses, steam and corrosive applications.
Vortex flow meters are also able to withstand high process pressures and temperatures. In a Vortex flow meter, an obstruction in the flow path, often referred to as a shedder bar, serves as the bluff body.
The shedder bar causes process fluid to separate and form areas of alternating differential pressure known as vortices around the back side of the shedder bar. The vortices cause a small sensing element either behind or within the shedder bar to oscillate back and forth at a specific frequency. With the known cross sectional area of the pipe, volumetric flow can be calculated. Vortex flow meters are well suited for a variety of applications across a wide range of industries including oil and gas, refining, chemical and petrochemical, and food and beverage.
Vortex flow meters also excel in steam-related applications including steam injection and steam measurement for district energy systems and industrial plants. For safety-related measurement in SIS applications, dual and quad Vortex flow meters with redundant, independent sensors and electronics are critical for the prevention of common modes of failure and spurious shutdowns.
The non-clog, leak-free Vortex flow meter design is ideal in hazardous chemical applications, especially where fugitive emissions are a concern. With safety and reliability being at the pinnacle of our proprietary design, the all-cast, gasket- free, sealed meter body eliminates leak points to keep your operations up and running. No moving parts or need to install impulse lines means fewer process upsets and smoother operations for your plant.
The integrated, removable temperature sensor is isolated from the process and separate from the Vortex flow sensor. Not only does the shedder bar serve as an obstruction in the flow path, it also serves as the thermowell for the integrated temperature sensor. This eliminates the need for a separate temperature measurement point.
The temperature sensor provides reliable temperature measurement with excellent vibration immunity and wide temperature measurement range. The MultiVariable Vortex can provide a pressure compensated saturated or superheated mass flow measurement by receiving a pressure measurement from a HART pressure device.
The MultiVariable Vortex paired with the industry-leading Rosemount S Pressure Transmitter delivers a highly accurate steam mass flow reading. Pellentesque nec felis tristique urna lacinia sollicitudin ac ac ex. Maecenas mattis faucibus condimentum. Curabitur imperdiet felis at est posuere bibendum. Sed quis nulla tellus.
Any medium passing through the pipeline flows around the bluff body and sheds a series of alternating vortices on each side of the body. This phenomenon is known as Vortex Shedding. These vortices shed downstream of the bluff body and dissipate as they flow further.
This pattern of vortices is called a Karman vortex street. A vortex flow meter primarily consists of a bluff body, a sensor assembly and a transmitter. A bluff body or a shedder is nothing but a non-streamlined object or a barrier placed perpendicular to the axis of the pipeline, around which the medium flows. The frequency of the vortices, i. This vortex shedding frequency is used to calculate the mass flow. The sensor assembly records the pressure and velocity oscillations generated on each side of the bluff body by the vortices and generates a digital linear output signal.
The vortex shedding frequency is calculated using the following formula:. Strouhal Number, St. Calculation of volume flow rate When the vortex shedding frequency is known, the volumetric flow rate can be calculated using the formula:.
Depending on the mounting style, the types of vortex flow meters include:. Vortex flow meters use bluff bodies to break up the flow enough to create eddies. Bluff body types and shapes will vary among vendors. Vendors even have patents for them, because some will result in flow meters offering less pressure loss, others in lower measuring range, and so on.
Want to read about the Coriolis flow meter, you can check out our article on Coriolis. The vortex flow meter can measure a variety of fluid products. However, the meter itself measures volume flow. So to measure mass, we have additional features to allow accurate measurement. When we need just the numbers for volume flow, the meter can measure that directly.
For mass flow, a vortex flow meter must have a component to calculate the measurement as well as a temperature sensor. In some applications, you need a pressure transmitter too. Some vendors build all of these into their vortex meters, and others may only include a couple and have the rest as add-ons.
If one needs mass flow, then you should check what your vortex meter has to do that. Below are some of the main vendors of vortex flow meters. To know more, you can read our article on the best Vortex flow meters.
Foxboro is a household name in the instrumentation world, owned by Schneider today. The 83S is a universal flow meter, so we can apply it in many processes.
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