3/7/2024 0 Comments Electromagnetic flow meterHowever, if the density is constant, the time of passage (or reflection) of ultrasound can be used to determine the velocity of the flowing fluid.ĭoppler flow meters utilize the Doppler effect, which is a frequency shift caused by waves emitted or reflected from a moving object. The speed of sound propagation in a fluid depends on the density of the fluid. For these reasons, they have gained wider acceptance among users. In addition, initial and maintenance costs are very low. The main advantages of vortex flow meters are their low sensitivity to changes in process conditions and low wear relative to orifice or turbine flowmeters. Naturally, if the back pressure on the meter is lower than the steam pressure, the process fluid will flash and the meter reading will be meaningless. It is also important to ensure that the shrink pressure is not lower than the vapor pressure of the process fluid, as this can lead to cavitation. However, downsizing (installing smaller than line size gauges) to increase the Reynolds number can increase the head loss to more than 10 psi. (Velocity head is defined as V2/g, where V is the flow rate and g is the gravitational constant in consistent units.) If the piping and instrumentation are properly sized and identical, the pressure drop may be only a few pounds per square inch. The permanent pressure loss through the vortex flowmeter is about half that of an orifice flowmeter with about two velocity heads. On the other hand, if the reduced range is acceptable and the meter is sized for normal flow, then a vortex flowmeter may still be considered. Therefore, in this type of service, the gauge is likely to have a poor range and will not be able to measure low flow rates. Low pressure (low density) gases will not generate strong enough pressure pulses, especially at low fluid velocities. The smaller the total batch, the more significant the resulting error may be. This is because the drip flow setting of the dosing station may be below the minimum Reynolds number limit of the meter. Vortex flow meters are not typically recommended for dosing or other intermittent flow applications. In practice, a k-factor representing the number of vortices generated per unit volume is used instead of S. S varies with Reynolds number however, it is almost constant over a wide range of flow rates. And ultrasonic flowmeters owe their successful application to sophisticated digital signal processing. Vortex flowmeters rely on piezoelectric sensors to detect vortex currents coming off a fixed shedding bar. Common types of electronic flow meters are electromagnetic, vortex and ultrasonic flow meters.Įlectromagnetic flowmeters are essentially the most straightforward electrical flowmeters with a first operating principle derived from Faraday’s Law. Flow meters have many names depending on the specific industry, such as flow meters, flow indicators, liquid meters, flow sensors, flow meters, etc.Įlectronic flow meters are industrial digital flow meters used for liquid flow measurement. How to choose your electronic flow meter?Ī flow meter is a device used to measure the volume or mass of a gas or liquid.Disadvantages of ultrasonic flow meters.Disadvantages of using electromagnetic flow meters.Advantages of using electromagnetic flowmeter.Electronic flowmeter types and working principle.Please select one of our electromagnetic flow meters below for more information. This ensures you’ll receive durable and reliable products needed to accurately measure your flow applications. We stand by the quality of our products and offer a 1-year no-fault warranty and a 3-year manufacturer warranty on all of our electromagnetic flow meters. ONICON has a wide selection of quality electromagnetic flow meters that are specifically calibrated to meet your needs and ensure your products can be easily installed and used right out of the box. Our team is driven by delivering excellent customer service from start to finish and out in the field if you need it. ONICON is an industry-leading electromagnetic flow meter manufacturer with years of experience providing our customers with comprehensive solutions. These meters are designed with advanced filtering and signal processing circuitry to maximize performance and reliability. Flow in all kinds of conductive liquids can be accurately measured by utilizing the pulsating magnetic fields. ONICON electromagnetic flow meters are designed for the most demanding applications.
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