For best results, calibrate the meter at least 1 time per year. In an irrotational vortex flow with constant fluid density and cylindrical symmetry, the dynamic pressure varies like p. From version with reduced nominal diameter to dual device with two flow converters. As fluid moves across a vortex meter shedder bar, vortices form.
Velocity flow units allows the user to select the velocity flow units from the available list. The frequency of alternating of these vortices is proportional to the flow rate being obstructed. Applicable in a variety of fluids, vortex meters can be easily installed and deliver accurate measurement over a potentially impressive turndown. Injection molded and constructed of durable pps polyphenylene sulphide material and stainless steel, these vortex meters can withstand extreme temperatures. The frequency that the vortexes are shed depend on the size and shape of the body. Particles and internal bubbles do not usually affect vortex meters. In a vortex flow meter, an obstruction in the flow path, often referred to as a shedder bar, serves as the bluff body. Integrated pressure and temperature compensation, integrated energy calculator. Meters are available as loop powered devices or with up to three 420 ma analog output signals for. The vortex shedder of yewflo has a trapezoidal cross section which provides excellent linearity of the vortexshedding frequency and generates a stable and strong street pattern. The frequencies of the vortices are directly proportional to the velocity of the flow. The vortices shed by both bluff bodies propagate really far beyond the pipe, and may affect the other meter s readings. Vortex flow meters are suitable for a variety of applications and industries, but ideally work with clean, lowviscosity, medium to high speed fluids.
The meter requires a nominal 24 vdc power source and outputs a visual display of flow, as well as 420 ma proportional to flow, and a field settable solid state relay for low flow alarm conditions. Vortex flow meter styles smart vortex meters provide a digital output signal containing more information than just flow rate. Minimum required backpressure is 10 psig at maximum flow and at 70 f 21 c. The frequency of the vortices shedding is proportional to the fluid velocity. Flow monitors vortex shedding flowmeter description this flowmeter is made for water, waterglycol coolant or low viscosity fluids. Eliminate bypass piping for critical process installations. Sparling offers vortex flow meters with rugged material construction and design engineering that are suited for a wide array of applications. 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 vortex frequency is proportional to the flow velocity in a specific range of reynolds numbers. 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. Velocity measurement base determines if the velocity measurement is based on the mating pipe id or the meter body id. Its sensitivity to variations is low in process conditions and low wear relative to other types of flow meters. This idiosyncrasy makes vortex flow meters entirely unsuitable in applications where the desired flow measurement range extends all the way down to zero.
This gives you an array of flow solutions to best suit your requirements. 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. Allows the user to view the velocity flow rate value and units. Vortex flowmeters, also know as vortex shedding flowmeters or oscillatory flowmeters, measure the vibrations of the downstream vortexes caused by a barrier in the moving stream. The piping system must create some backpressure on the meter to allow vortex formation and to prevent cavitation, especially at full flow. Vortex flow meters flow instrumentation badger meter. Vortex flow meters also excel in steamrelated applications including steam injection and steam measurement for district energy systems and industrial plants.
Flow meter readings are to be corrected for pressure. These being intrusive meters like orifice meters, will cause the pressure drop as flow is increased, resulting in a permanent loss. Working principle of vortex flow meter instrumentationtools. Vortex flow meters can calculate the steam surge at diverse velocities. When there is a columnshaped obstruction vortex shedder in flowing fluid, it will generate alternating vortices downstream. If the volumetric flow rate through a vortex flow meter falls below the low flow cutoff value, however, the flow meter s signal goes completely to zero, indicating no flow at all. In a rigidbody vortex flow of a fluid with constant paraboloid. Measure the volumetric flow rate of the recovered landfill gas. Vortex flow meters are suitable for measuring steam as well as a variety of liquids and gases. Introduction to vortex flow meter technology youtube. The meter can be kept flooded by installing it in a vertical upward flow line. The vibrating frequency of the vortex shedding is related to the velocity of the flow. Flow meter performance, validation and compliance to 40 cfr. The meters come precalibrated for the specific range as determined by size.
Accessory cables available for pin connector meters series description length in part meters number cp 5 pin 1 62411m female 3 624m 10 624110m ct 8 pin 2 62422m female 5 62425m. Vortex flow meters icenta flow meters and level sensors. With builtin temperature compensation as a standard feature and optional integral pressure compensation, it is the first choice for saturated steam, superheated steam and compensated gas flow measurement. The fv101 series comprises inline flow meters that use the vortex shedding measuring principle. This creates a pressure on a sensor body containing a piezoelectric crystal. Recalibrate flow meters either biennially every 2 years or at the minimum frequency specified by the manufacturer.
Vortex flowmeter is a flowmeter for measuring fluid flow rates in an enclosed conduit. Digital vortex mass flow meters all feature large lcd display, shows the instantaneous instant flow rate, total flow, temperature, and density in user selectable units. The versaflow is the only vortex flowmeter with integrated pressure and temperature compensation in 2 wire technology. A market leading process measurement device, the versaflow vortex shedding flow meter is designed with steam and gas applications in mind. When tightening the vortex, use a wrench only on the wrench flats.
Sv series vortex flow meter in welding applications, it is essential to control the flow rate and tempera ture of cooling water to prolong the life of the welding tip and to assure that the weld cools rapidly for optimum quality. When installing the flowmeter in a downward or horizontal flow, the downstream piping should be kept elevated. The vf 2000 flow sensor body and shedder bar vortex generator are molded as one component. For utility applications, advanced energy management and safety instrumented systems sis. Vortex flow meters are famous due to its combination with multivariable meters. Higher backpressures are required at elevated temperatures and occasional surges to 125% of maximum flow. Therefore, flow velocity or flow rate can be determined by measuring vortex frequency. The real answer is that using two vortexshedding flow meters for bidirectional flow is an improper application.
The pressure loss is low, has a broad span range and high accuracy. Vortex meters can be installed vertically, horizontally, or at any angle, as long as they are kept flooded. For instance, heavy particle suspension will wear down internal parts on some meters or cause sensing inaccuracies for nonobtrusive metering systems. A vortex flow meter works based on the principle of karman vortex street demonstrated in the below figure this principle essentially means that when an obstruction is placed in path of a flow, it can produce a series a vortices alternating from each side of the obstruction. It is not influenced by density, pressure, temperature and viscosity when measuring volumetric flow. Vortex flow meters can be simply defined as a type of flow sensor which is capable of detecting and measuring the frequency of vortices generated by a body which has been placed in the flow stream. The fluid strikes a bluff body, imparting alternating vortices downstream of the bluff. For vortex flow meters, high viscosities tend to dampen the formation of vortices and reduce the effective range.
The rosemount 8800d critical process vortex increases process availability and enhances overall safety. Flow meters used in gas collection systems must conform to the following. Vortex meters are actual volume flow meters, like orifice meters. A vortex flow meter is suitable for flow rate or flow totalization measurements in industrial grade, brass or all plastic models. Series simple body construction for easy installation and high level of safety features of the vortex flowmeter piezoelectric. Based on the karman vortex street, a vortex meter measures the frequency of vortices that are shed behind a bluff body that is placed in a flow stream. Karman vortex flow meter flow knowledge keyence america. Volume flow measurement is enough for substances with small variations in density such as liquid. The microprocessor in the flowmeter can automatically correct for insufficient straight pipe conditions, for differences between the bore diameter and that of the mating pipe, for thermal expansion of the bluff body, and. This design approach has reduced the cost as well as the size and weight of the flowmeter.
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