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Coriolis Flow Meter

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Coriolis Flow Meter

Coriolis mass flow meters are used to measure mass using inertia. A gas or a liquid flows through a tube that is being pulsated by a tiny actuator. This pulsation results in a phase shift due to adding some Coriolis acceleration to the fluid stream. This acceleration results in a quantifiable force applied to the tube. The force is directly proportional to the mass, and the meter detects the resultant angular momentum to determine the mass flow. Read More…

Coriolis Flow Meter Coriolis flow meters are also referred to as simply mass flow meters, or even inertial flow meters, and they measure the rate of flow by the mass per unit time, otherwise known as the force of the acceleration.
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Monterey, CA  |  831-373-0200

Sierra manufacturers high performance mass flow meters and controllers for nearly any gas, liquid or steam. Customers choose Sierra when they need an accurate and repeatable flow measurement, short delivery lead times, expert flow advice and long term support. When it matters, choose Sierra. Visit www.sierrainstruments.com.

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Sierra Instruments $$$

Sturtevant, WI  |  262-886-2695

SIKA is a developer and manufacturer of flow control products and a wide variety of other measuring and monitoring systems. Our inventory includes flow sensors, flow meters, flow switches, and many more. We know that flow solutions aren't one-size-fits-all, which is why we provide consultation and flow management solutions that are individualized and customized to your requirements. When you choose SIKA, you will receive efficient, durable products and customer service tailored to your needs.

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Cranston, RI  |  877-737-3569

Primary Flow Signal offers a wide range of flow meters and measurement devices. Among this product offering are flow meters for pressurized line fluids (liquid, gas, steam); rectangular conduit meters; bidirectional flow meters; open channel flow meters and more.

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Primary Flow Signal, Inc. $$$

Irvine, CA  |  800-325-1405

The flow meters that we are able to provide will withstand the tests of time in order to provide a long lasting value! We have locations in thirty five countries worldwide and we are dedicated to being wherever you need us to be! We have the knowledge and the capability to work with you closely in order to come up with the perfect product to suit your needs! Visit our website today to learn more about what we may do for you!

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Burkert Fluid Control Systems $$$

Acworth, GA  |  770-917-0940

Flow Network specializes in measurement and control of Flow, Pressure, Temperature, and Level. Local Stock and Technical Support along with competitive prices.

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Flow Network $$$
placeholder image Sierra Instruments SIKA USA Primary Flow Signal, Inc. Burkert Fluid Control Systems Flow Network

Coriolis flow meters can measure flow into the tube going either forward or backward. In most configurations, the tube is vibrated between two locations where it is anchored. It is possible to picture this design rattling a mass and spring combination. This arrangement will vibrate once it is in motion at its resonance frequency, which depends on the mass of the assembly. The minimum driving force required to maintain a steady vibration of the filled tube leads to the selection of this resonance frequency.

Design of a Coriolis Flow Meter

The Coriolis effect, an inertial force brought on by the Earth's rotation, is exploited by this type of flow meter to produce an extremely accurate estimate of mass flow and the fluid density. The most common components of these flow meters are a drive unit, displacement sensors, and a U-shaped flow tube with an inlet and an exit that allows for flow. The flow is initially directed into the flow tube via the intake, where it is then subjected to an oscillatory excitation force that causes the tube to vibrate. Once the vibration has been accomplished, the fluid flow will cause the tube to rotate due to the Coriolis effect. Due to the acceleration solely on a single side of the tube, the inlet, and deceleration on the other, this effect rotates the tube (the outlet). As a result, there is a time delay since the intake may detect the stream before the output can. The gas or fluid mass flow rate is approximately equal to this time delay. Hydrogen gas, bituminous fluids, natural gas, and water are just a few of the fluids and gasses that can have their mass flow rates measured by Coriolis flow meters. Coriolis flow meters are frequently built from corrosion-resistant materials like stainless steel and metal alloys because some of the fluids or gasses they measure are corrosive.

Components of a Coriolis Flow Meter

U-Shaped Tube

The U-shaped tube is the most crucial component of a Coriolis flow meter because it is the source of the readings. Materials that enter tubes oscillate in an angular oscillatory motion, which causes the tube to deform. The arrows in the diagram below illustrate how a liquid or gas moves through the tube.

A U-Shaped Tube


The exciter makes sure that the tube is constantly oscillating and moving. The oscillation motion is uniform when there isn't any flow. The exciter is situated at the lowest position of the tube between the measuring sensors, as shown in the image below.

Coriolis Meter with an exciter at the bottom

Electrically-Dynamic Sensors

At the entrance and outflow, sensors are placed to track oscillation. Even though there is no flow, the oscillation is uniform, but it changes when a fluid or gas is introduced. The entrance and exit parts of the tube oscillate in opposite directions due to the inertia of the liquid. The sensors detect the phase shift, also known as the shift in oscillations in both time and space.

Pickup Sensors

Phase Change Sensors

The phase shift, which is the end consequence of the oscillatory motion of the tube, is a true measure of how much liquid or gas is going through the pipe. A linear result equal to the flow is produced by its measurement. This kind of measurement is usable with any material because it is not dependent on the contents of the tube. These sensors additionally gauge the fluid or gas's inherent frequency. The frequency change—the number of times the tube swings forward and backward in a second—relates directly to the material's density. The volume flow rate is calculated by measuring the rate of mass flow and density. Finally, temperature is measured as one of the different measurements to account for dynamic changes brought on by the contraction and expansion of the tube.

Control Panel

A Coriolis flow meter uses the data collected from tube oscillations and phase shifts to calculate liquid or gas volume, mass, and density. Depending on the kind of meter, the display on its front can be adjusted to show mass flow readings in pounds or kilograms. Coriolis flow meters are quite adjustable. They might be very small, like 0.04 inches (1 millimeter), or very large, to accommodate petroleum and oil operations. Before buying and installing the meter, it is necessary to decide on several criteria that affect the choice of a flow meter.

Coriolis Flow Meter Informational Video


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