Dosing is a crucial step in the manufacturing process for a variety of products, including chemicals and cosmetics. To ensure that the product contains exactly the amount stated on the package, this process must be quick and precise. The proper dosing of liquids depends on electromagnetic flow meters.

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What is a magnetic flow meter?

As the name suggests, the electromagnetic flow meter measures the flow of conductive liquid. It can also gauge the flow rate of pulps and mixtures. The medium whose flow is being measured may be pure or contaminated, inert or chemically aggressive. The electromagnetic flow meter measures the flow of the fluid as well as its impurities.

In order to use a flow meter of this type, you must measure a conductive liquid or another medium through which an electric current can flow. For standard design magnetic flow meters, the conductivity should be higher than 5 µS/cm.

One of the few drawbacks of electromagnetic flow meters is that they can only measure liquid flow in conductive materials. For that reason, they cannot be used, for instance, to gauge the volumetric flow rate of dielectric liquids, and they are not useful in the transportation of crude oil.

However, compared to conventional volumetric flow meters, electromagnetic flow meters offer a number of benefits. They do not cause the pressure of the medium being measured to decrease. Additionally, they do not have any moving parts, which greatly enhances their dependability.

What exactly is the operating principle of the electromagnetic flow meter? It relies on Faraday’s law of electromagnetic induction to measure fluid flow. According to this law, an electromagnetic force is induced in a conductor moving in a magnetic field that is proportional to the strength of the magnetic field and the speed of the conductor. Of course, a conductive liquid is the conductor in this case.

The magnetic flow meter consists of electrodes that are used to measure the potential difference, a measuring tube that is electrically insulated and coils that produce a magnetic field. The measurement of fluid flow is entirely independent of the fluid’s properties because of the magnetic field generated by a DC current of varying polarity.

Electromagnetic flow meters can be powered using a small amount of energy. They can also measure both very low and very high flow rates. Additionally, average flow velocity can be measured in both directions.

Application of magnetic flow meters in dosing lines

An increase in production process data is a current trend across many industries. This includes such information as the measure of liquid velocity, viscosity and many other parameters. On top of this, improving production accuracy and efficiency is a constant focus.

These trends are also evident in industries that make extensive use of dispensing equipment. The food, cosmetics and pharmaceutical industries are just a few examples. The demand for faster and more precise monitoring of the flow of dosed substances has increased with the development of dosing equipment. The electromagnetic flow meter, which enables even more accurate product dosing into individual packages, is the answer to these demands.

Older dosing equipment relies on mechanical or weighing measurement technology to determine a quantifiable flow velocity and an accurate dose of the product. However, compared to electromagnetic flow meters, these alternatives are more expensive and do not provide as much measurement flexibility. That is why in recent years, they have become the preferred technology for determining the correct dosage of substances.

Magnetic flow meters are used, e.g., in dosing lines manufactured by Unilogo. They handle a variety of liquid products found in the food, cosmetic, and pharmaceutical industries. Unilogo’s dosing lines are designed to dose a wide range of substances with different density and viscosity. The correct product dose is dispensed using a volumetric method by means of pistons, electromagnetic flow meters or mass flow meters, depending on the chosen solution.

Advantages of magnetic flow meters

What distinguishes electromagnetic flow meters from traditional models? Design simplicity is their main benefit. Electromagnetic flow meters have very high reliability because they include no moving parts.

Wherever fluid flow measurement is needed in corrosive environments, electromagnetic flow meters are a perfect choice. Additionally, they allow for the measurement of chemically active liquids with acidic or alkaline affinity.

The density, temperature, pressure, or viscosity of the medium do not affect the outcomes of a measurement made with an electromagnetic flow meter. As a result, there is a lower risk of error in the measurement.

Due to its design without any bottlenecks, the electromagnetic flow meter does not generate pressure losses in the hydraulic system, so it does not introduce disturbances into the flow of the measured medium.

Electromagnetic flow meters also have a very high turndown coefficient, which stands for accuracy when measuring a flow lower than its full measuring range. These devices typically have a turndown ratio of 40:1, which means that they can precisely measure a flow rate corresponding to 1/40 of their maximum measuring range.

Magnetic flow meters – summary

The electromagnetic flow meter is measuring equipment that is increasingly used in the construction of dosing lines. It expedites and improves dosing. This is due to the high accuracy of the flow meter itself and the fact that the temperature, density, viscosity, or pressure of the medium being measured has no impact on the readings of the flow meter. The absence of moving parts results in failure-free operation and minimal additional maintenance requirements.

If you are thinking about buying a dosing line, use the contact form on our website to get in touch with Unilogo. We guarantee that our team of skilled engineers will make every effort to develop and present the ideal solution for your company.