Electromagnetic Flow Meter

$ 1,681.65$ 5,827.50

A magnetic flow meter (mag flow meter) is a volumetric flow meter that does not have any moving parts and is ideal for wastewater applications or any dirty liquid that is conductive or water-based.  Magnetic flow meters will generally not work with hydrocarbons, distilled water, and many non-aqueous solutions.  Magnetic flow meters are also ideal for applications where low-pressure drops and low maintenance are required.

Description

Electromagnetic Flow Meter

An Electromagnetic flow meter (mag flow meter) is a volumetric flow meter that does not have any moving parts and is ideal for wastewater applications or any dirty liquid that is conductive, or water-based.

An Electromagnetic flow meter will generally not work with hydrocarbons, distilled water, and many non-aqueous solutions.  Magnetic flow meters are also ideal for applications where low-pressure drops and low maintenance are required.

To apply this principle to flow measurement with an Electromagnetic flow meter.  Additionally, it is necessary first to state that the fluid being measured must be electrically conductive for the Faraday principle to apply.

Also, In the case of a wafer-style Electromagnetic flow meter, a magnetic field is established throughout the entire cross-section of the flow tube.  If this magnetic field is considered the measuring element of the magnetic flow meter, it can be seen that the measuring element is exposed to the hydraulic conditions.  This is throughout the entire cross-section of the flow meter.  With insertion-style flow meters, the magnetic field radiates outward from the inserted probe.

An electromagnetic flow meter is a type of flow meter that uses Faraday’s law of electromagnetic induction to measure the flow rate of a conductive fluid.  It operates based on the principle that when a conductive fluid flows through a magnetic field, a voltage is induced across the fluid that is proportional to the velocity of the fluid.

What does it consist of?

An electromagnetic flow meter consists of a flow tube made of a non-magnetic material such as plastic or ceramic, with two electrodes mounted on opposite sides of the tube.  A magnetic field is generated perpendicular to the flow tube, and when a conductive fluid flows through the tube, the voltage induced across the electrodes is proportional to the flow rate of the fluid.

The advantages of electromagnetic flow meters include their high accuracy, their ability to measure flow rates in both liquids and gases, their ability to handle corrosive and abrasive fluids, and their ability to measure bidirectional flow.  Finally, they are commonly used in industries such as water and wastewater treatment, chemical and petrochemical, and food and beverage.

However, electromagnetic flow meters may not be suitable for applications where the fluid is non-conductive or has a low conductivity, such as oils or hydrocarbons.  Additionally, they may require periodic calibration to maintain their accuracy, and their accuracy may be affected by changes in fluid temperature and conductivity.

Law

As applied to the design of magnetic flow meters, Faraday’s Law indicates that signal voltage (E) is dependent on the average liquid velocity (V) the magnetic field strength (B), and the length of the conductor (D) (which in this instance is the distance between the electrodes).

Also, In the case of a wafer-style Electromagnetic flow meter, a magnetic field is established throughout the entire cross-section of the flow tube.  If this magnetic field is considered the measuring element of the magnetic flow meter, it can be seen that the measuring element is exposed to the hydraulic conditions throughout the entire cross-section of the flow meter.  With insertion-style flow meters, the magnetic field radiates outward from the inserted probe.

An electromagnetic flow meter, also known as a magnetic flow meter or mag meter, is a type of device used to measure the flow rate of electrically conductive fluids, such as water or wastewater.

Components

The basic components of an electromagnetic flow meter include a flow tube, an excitation coil, and two sensing electrodes.  The flow tube is typically made of non-magnetic material, such as stainless steel, or lined with a non-conductive material to prevent corrosion.  It has a circular cross-section to ensure uniform flow distribution and minimize pressure drop.

The excitation coil is wound around the flow tube and generates a magnetic field when an electric current passes through it.  This magnetic field is perpendicular to the fluid flow direction and interacts with the conductive fluid.  As the fluid flows through the magnetic field, it induces a voltage in the fluid proportional to its velocity.

Electrodes

The sensing electrodes are located on opposite sides of the flow tube, perpendicular to the magnetic field.  They are in contact with the fluid and provide a path for the induced voltage to be detected.  The voltage between the electrodes is proportional to the fluid velocity and is measured by the flow meter’s electronics.

To ensure accurate measurements, various factors need to be considered.  The flow meter must be calibrated for the specific fluid being measured, taking into account its conductivity and temperature.  The flow tube diameter should also be selected based on the expected flow rates, ensuring that the flow velocity remains within a suitable range for accurate measurements.

Electromagnetic flow meters offer several advantages over other flow measurement technologies.  They do not have any moving parts, reducing the risk of wear and tear and minimizing maintenance requirements.  Additionally, they can measure a wide range of flow rates, from low to very high velocities.  The accuracy of electromagnetic flow meters is also relatively high, typically within ±0.5 to 1% of the actual flow rate.  They are also unaffected by changes in fluid density, viscosity, or temperature, making them suitable for various applications.

Limitations

There are, however, some limitations to consider when using electromagnetic flow meters.  They require a conductive fluid to operate correctly, meaning non-conductive or non-ferrous fluids cannot be measured accurately.  Additionally, the presence of air bubbles, foam, or solids in the fluid can affect the measurements and may require additional precautions, such as the use of straight pipe sections or flow conditioning devices.

In recent years, advancements in technology have led to the development of more sophisticated electromagnetic flow meters.  These include features such as digital signal processing, self-diagnostic capabilities, and improved resistance to noise and electrical interference.  These advancements have further improved the accuracy and reliability of electromagnetic flow meters in various industrial, municipal, and commercial applications.

Valuable Tool

In conclusion, an electromagnetic flow meter is a valuable tool for measuring the flow rate of electrically conductive fluids.  It relies on the principles of electromagnetic induction to provide accurate and reliable measurements without any moving parts.  With ongoing technological advancements, electromagnetic flow meters continue to be widely used in diverse industries for the monitoring and control of fluid flow.

One important aspect is the selection of the appropriate liner material for the flow tube.  Since electromagnetic flow meters are often used for measuring corrosive or abrasive fluids, the flow tube should be lined with a material that can resist such conditions.  Common liner materials include polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), rubber, and various types of ceramics.  The choice of liner material depends on the specific application and the properties of the fluid being measured.

Orientation

Another consideration is the installation orientation of the flow meter.  Electromagnetic flow meters are typically installed in a horizontal, vertical, or inclined pipe section.  The installation orientation can impact the accuracy of the measurements.  For example, air bubbles or gas pockets may accumulate at high points in a vertical installation, potentially affecting the flow rate readings.  It is crucial to follow the manufacturer’s guidelines and recommendations for proper installation.

Calibration

Calibration is fundamental to ensuring accurate measurements.  Electromagnetic flow meters usually require calibration to account for deviations or variations caused by factors such as fluid conductivity changes, temperature fluctuations, or electrode aging.  Calibration can be performed in situ using reference flow meters or by using laboratory calibration facilities, depending on the specific requirements.

Additionally, electromagnetic flow meters may incorporate various features and technologies to enhance their functionality and reliability.  For instance, some models employ digital signal processing algorithms to filter out noise and interference, improving the signal-to-noise ratio and accuracy of the measurements.  Others may include self-diagnostic capabilities to detect issues such as electrode coating or faulty electronics and provide alerts or alarms for maintenance or troubleshooting purposes.

Industries Served for Electromagnetic Flow Meter

Overall, electromagnetic flow meters are widely used in industries such as water and wastewater management, chemical processing, pharmaceuticals, food and beverage, and many others.  Their accuracy, reliability, and ability to handle a broad range of flow rates and fluid conditions make them a popular choice for flow measurement in various applications.

Electromagnetic flow meters are commonly used in a variety of applications across industries.

Some key applications include:

  1. Water and wastewater treatment:  Electromagnetic flow meters are frequently used for measuring the flow rate of water and wastewater in treatment plants. They are highly accurate and reliable, even with fluids containing suspended solids and chemicals.
  2. Chemical and petrochemical industry:  In chemical and petrochemical processes, precise flow measurement is crucial for optimizing production and ensuring the safety of operations. Electromagnetic flow meters are widely used for measuring corrosive and hazardous fluids in this industry.
  3. Food and beverage industry:  Electromagnetic flow meters find applications in the food and beverage industry for measuring the flow rate of liquids such as milk, fruit juices, and syrups. They are hygienic, have no moving parts, and can handle fluids with solid particulates.
  4. Pharmaceutical industry:  Flow metering is critical in pharmaceutical manufacturing to ensure accurate dosing and maintain product quality. Electromagnetic flow meters are commonly used for measuring the flow rate of various liquids, including solvents, acids, and bases.

Benefits of electromagnetic flow meters include:

  1. High accuracy:  Electromagnetic flow meters offer excellent measurement accuracy, typically within ±0.5 to 1% of the flow rate. This enables precise flow monitoring and control.
  2. Wide range of fluid compatibility:  These flow meters can handle a variety of conductive fluids, including corrosive, abrasive, and viscous liquids. They are suitable for applications across different industries.
  3. Minimal pressure loss:  Electromagnetic flow meters have a negligible pressure drop due to their full-bore design, ensuring energy efficiency and reduced operating costs.
  4. Low maintenance:  Unlike mechanical flow meters, electromagnetic flow meters have no moving parts.  This reduces the need for maintenance and minimizes the risk of mechanical wear and failure.
  5. Versatile installation options:  These flow meters can be installed in various orientations.   Such as horizontal and vertical pipelines, making them adaptable to different installation requirements.

Electromagnetic Flow Meter

Electromagnetic Flow Meter Selection

The key questions which need to be answered before selecting a magnetic flow meter are:

  • Is the fluid conductive or water-based?
  • Is the fluid or slurry abrasive?
  • Do you require an integral display or a remote display?
  • Do you require an analog output?
  • The minimum and maximum flow rate for the Electromagnetic flow meter?
  • What is the minimum and maximum process pressure?
  • The minimum and maximum process temperature?
  • Is the fluid chemically compatible with the flow meter wetted parts?
  • What is the size of the pipe?
  • Is the pipe always full?

Installation Considerations of Electromagnetic Flow Meter

First of all, select a location for the Electromagnetic flow meter sensor.  After that, the flow profile is fully developed and not affected by any disturbances.   Consequently, a minimum of 10 pipe diameters of straight run upstream and 5 diameters downstream is recommended.

Furthermore, some situations may require 20 pipe diameters or more upstream to ensure a fully developed turbulent flow profile.  Also, the insertion mag meter is sensitive to air bubbles at the electrodes.  Finally, if there is any question that the pipe is absolutely full.  To do this, mount the sensor at a 45 to 135-degree angle.

 Grounding requirements

Electromagnetic Flow Meter are sensitive to electrical noise which is present in most piping systems.  Another type is in plastic piping systems, the fluid carries significant levels of static electricity.  Additionally, the meter must be grounded for the best mag meter performance.  In conclusion, instructions are included with the installation manual on how to best ground the magnetic flow meter.

In-Line Mag meters

The in-line type Electromagnetic flow meter offers a higher accuracy.  Also, they can be as accurate as 0.5% of the flow rate.  The insertion styles offer a 0.5 to 1% accuracy.

Also, In-line flange and wafer-style meters offer higher flow rates of 1 to 10 m/sec.  These in-line meters are offered in pipe sizes up to 12″.

Installation Considerations

An In-line Electromagnetic flow meter doesn’t require as much straight pipe as the insertion styles.  A minimum of 5 to 10 pipe diameters of straight run upstream.   1 to 2 diameters downstream are recommended.

In addition, in vertical pipe runs, flow should always run up and not down.  These flow meters are very sensitive to air bubbles.  Finally, the mag meter cannot distinguish entrained air from the process fluid.  Therefore, air bubbles will cause the mag meter to read high.

 

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Additional information

Weight 8 lbs
Dimensions 20 × 20 × 20 in
Size

1/4" (0.0007-0.45 m3/hr), 3/8 (0.009-1.23 m3/hr), 1/2" (0.005-1.93 m3/hr), 1" (0.017-5.30 m3/hr), 1-1/2" (0.053-15.2 m3/hr), 2" (0.070-22.95 m3/hr), 3" (0.176-55.47 m3/hr), 4" (0.276-85.38 m3/hr), 6" (0.611-196 m3/hr), 8" (1.10-346 m3/hr), 12" (2.51-778 m3/hr)

Media Type

Conductive Liquids >4 Microsiemens / Cm

Pressure Class

150LB (200PSIG @ <400F), 300LB (635PSIG @ <400F)

Connection end

Flanged, Sanitary

Voltage

24VDC, 85-220VAC

Classification

General Duty, Explosion Proof (EXd)

Output

4-20 MA, 0-10KHZ, 0-10VDC (Optional)

Communication Protocol

HART, RS485

QC Test Certificate

No, Yes

Display

Yes

Lining

Polychloroprene Rubber, Urethane Rubber, PTFE, F46, PFA

Electrode Material

316L, HB HC, TI, TA (Tantalum), SS with Tunsten Carbide, Platinum-Iridium

Accuracy

0.2%, 0.5%

Transmitter

Cumulative Flow, Instantaneous Flow, Forward Flow, Reverse Flow

Units

L/HR, L/MIN, L/SEC, M3/HR, M3/MIN, M3/SEC, GPM/HR, GPM/MIN, GPM/SEC

Approvals

CE, CMM3, ISO

Material

CS, SS304, SS316L

Flange Type

ANSI, ASME, BS, JIS, DIN

Specifications

 

Electromagnetic Flow Meter Specifications

ApplicationVelocity Range (FT/S)Velocity Range (M/S)
Normal Service0-390-12
Preferred Service2-200.6-6.2
Abrasive Slurries3-110.9-6.5
Non-Abrasive Slurries5-151.5-4.6

 

Downloads

User Manual of Electromagnetic Flow Meter

Electromagnetic Flow Meter Cut Sheet 1

Electromagnetic Flow Meter Cut sheet 2

 

 

Brochure

Electromagnetic Flow MeterrElectromagnetic Flow MeterrElectromagnetic Flow Meter

Q&A

A Q&A Electromagnetic Flow Meter which stands for “question and answers for Electromagnetic Flow Meter,” is a format commonly used to facilitate communication and exchange of information. In a Q&A Electromagnetic Flow Meter, one person asks a question, and another person or group provides an answer or response to that question. This format is widely used in various contexts, such as interviews, discussions, presentations, or online forums. It allows for a structured and organized way of addressing inquiries and obtaining relevant information. Is there anything specific you would like to know about Q&A Electromagnetic Flow Meter?

Q: What is an electromagnetic flow meter?

A: An electromagnetic flow meter, also known as a mag meter, is a type of flow meter that uses Faraday’s law of electromagnetic induction. This is to measure the velocity of conductive fluids, such as water or wastewater.

Q: How does an electromagnetic flow meter work?

A: An electromagnetic flow meter works by using a magnetic field to induce an electric voltage in a conductive fluid as it flows through a pipe. The voltage generated is proportional to the velocity of the fluid, which can then be used to calculate the flow rate.

Q: What are the advantages of using an electromagnetic flow meter?

A: Some advantages of using an electromagnetic flow meter include:

    • High accuracy and repeatability
    • No moving parts, which reduces maintenance requirements and increases reliability
    • Can measure flow rates of conductive fluids regardless of their viscosity or density
    • Can handle high flow rates and can be used in large pipe sizes
    • Can measure bidirectional flow

Q: What are some common applications for electromagnetic flow meters?

A: Electromagnetic flow meters are commonly used in the water and wastewater industry for measuring flow rates in pipes and open channels. They are also used in the chemical, food and beverage, and pharmaceutical industries for measuring the flow of conductive liquids.

Q: What are some potential limitations or drawbacks of using an electromagnetic flow meter?

A: Some potential limitations of using an electromagnetic flow meter include:

    • Can only measure the flow rate of conductive fluids
    • Requires a conductive fluid with a minimum level of conductivity for accurate readings
    • Can be affected by electromagnetic interference, which can lead to inaccurate readings
    • Can be more expensive than other types of flow meters, such as ultrasonic or turbine flow meters, depending on the application

Q: Can electromagnetic flow meters be used for hazardous fluids?

A: Yes, electromagnetic flow meters can be used for hazardous fluids as long as the materials of construction are selected to be compatible with the specific fluid and the operating conditions. For example, if the fluid is corrosive, the flow meter should be constructed of a material that is resistant to corrosion.

Q: How are electromagnetic flow meters installed?

A: Electromagnetic flow meters are typically installed in a horizontal or vertical orientation, depending on the application. The flow meter is mounted in the pipe or channel, and the electrodes are inserted through the wall of the pipe or channel and positioned to be in contact with the flowing fluid. The electrodes are then connected to the transmitter, which converts the signal into a flow rate reading.

Q: How accurate are electromagnetic flow meters?

A: Electromagnetic flow meters are known for their high accuracy and repeatability, with typical accuracy levels of ±0.5% to ±1% of the flow rate. However, the accuracy can be affected by several factors, including the fluid properties. Also, the installation location, and the quality of the signal conditioning electronics.

Q: How do electromagnetic flow meters compare to other types of flow meters?

A: Electromagnetic flow meters are often compared to other types of flow meters. Various Types such as ultrasonic, turbine, and positive displacement flow meters. Each type of flow meter has its strengths and weaknesses, and the choice of Electromagnetic flow meter depends on the specific application requirements. In general, electromagnetic flow meters are preferred for applications where high accuracy, and reliability. Also, low maintenance is important, and where the fluid is conductive.

Q: How do Q&A Electromagnetic Flow Meters handle changes in fluid density or viscosity?

A: Electromagnetic flow meters are not affected by changes in fluid density or viscosity, as long as the fluid remains conductive. This is because the meter measures the velocity of the conductive fluid, which is not affected by changes in its physical properties.

Q: Can electromagnetic flow meters be used for both liquids and gases?

A: Electromagnetic flow meters are designed to measure the flow of liquids, not gases. This is because gases are not conductive, so they do not generate the electrical signal needed for the meter to work.

Q: Can electromagnetic flow meters be used in applications with high turbulence or flow disturbances?

A: Electromagnetic flow meters can be used in applications with high turbulence or flow disturbances. As a result, the installation location and configuration of the meter must be carefully chosen. This is to minimize the impact of these factors on the accuracy of the meter.

Q: How do electromagnetic flow meters handle air or gas bubbles in the fluid?

A: Electromagnetic flow meters can be affected by air or gas bubbles in the fluid. They can disrupt the conductive properties of the fluid and cause errors in the flow measurement. To address this, some meters have built-in algorithms to detect and correct the presence of bubbles. Also, others may require additional hardware, such as a bubble eliminator or a degassing unit.

Electromagnetic Flow Meter

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