General Purpose Mag Meter application

What are Electromagnetic Flow Meters?

Magnetic flow meters, also known as mag meters,

or electromagnetic flow meters,

are widely used in a variety of industrial field applications,

due to their reliable flow rate measurements,

and features such as low pressure loss and maintenance-free operation.

A range of liner materials, electrode options,

and line sizes accommodate a wide variety of process applications. 

Mag meters can measure fluids bi-directionally,

are effective for both very low and high-volume flow rates.

Magnetic Flow Meters

The simple construction of our electromagnetic flow meters,

is the key to these advantages.

A Smart Measurement magnetic flow meter does not contain any moving parts,

rotating gears or turbines, or bearings.

Instead, it relies on two electrodes to measure the density of the induced magnetic field,

that results from an electrically conductive fluid,

such as water, flowing through a pipe.

The density of the magnetic field is directly proportional,

to the fluid velocity of the flowing liquid.

Sino-Instrument Magnetic Flow Meters

General Purpose Mag Meter

General Purpose Mag Meter
General Purpose Mag Meter
  • Line Sizes: ⅜”-110″     (6-2800mm)
  • Pressures: 580 psig (4.0Mpa) for line sizes up to 3″ (80 mm)
  • Temperatures: 5~+160 °F( -20~ +70 °C) – Integral,(-40 ~ +360°F (180°C) – Remote
  • Process Connections: Wafer, ANSI or DIN Flanges, Insertion-Type
  • Accuracy: std – ±0.5% opt – ±0.2%
  • Outputs: Pulse, 4-20mA, MODBUS, HART
  • Special Features: Conductivity > 5 µS/cm, velocity 0.2 – 12 m/s
  • Approvals: CE, ExdIIBT3~T6 (ATEX)
  • Display Types: Integral and Remote

Battery-Powered Mag Meter

Battery-Powered Mag Meter
Battery-Powered Mag Meter
  • Line Sizes: ⅛” – 24″ (3-600mm)
  • Pressures: 580 psig (4.0Mpa) for line sizes up to 3″ (80 mm)
  • Temperatures:
    Up to 300 °F (150 °C), dependent upon selected liner material
  • Process Connections: ANSI or DIN Flanges
  • Accuracy: ±0.5%
  • Outputs: Pulse, 4-20mA, RS485, HART
  • Special Features: Battery Powered (3.6 VDC)
  • Approvals: CE, ExdIIBT3~T6
  • Display Types: Integral

Energy/BTU Mag Meter

Energy-BTU Mag Meter
Energy-BTU Mag Meter
  • Line Sizes: ⅛” – 24″ (3-600mm)
  • Pressures: 580 psig (4.0Mpa) for line sizes up to 3″ (80 mm)
  • Temperatures:
    Up to 300 °F (150 °C), dependent upon selected liner material
  • Process Connections: ANSI or DIN Flanges
  • Accuracy: ±0.5%
  • Outputs: Pulse, 4-20mA, RS485
  • Special Features: BUT, Energy Calculation
  • Approvals: CE, ExdIIBT3~T6
  • Display Types: Integral and Remote

High Pressure Mag Meter

High Pressure Mag Meter
High Pressure Mag Meter
  • Line Sizes: 1″ – 8″ (25-200 mm)
  • Pressures: 6000 psig (42Mpa) – for all available sizes
  • Temperatures:
    Up to 300 °F (150 °C), dependent upon selected liner material
  • Process Connections: ANSI or DIN Flanges
  • Accuracy: std – ±0.5%, opt – ±0.2%
  • Outputs: Pulse, 4-20mA, RS485, HART
  • Special Features:
    Designed for high pressure applications – 6000 psig  (42 Mpa)
  • Approvals: CE, ExdIIBT3~T6 (CQST)
  • Display Types: Integral and Remote

Insertion-Style Mag Meter

Insertion-Style Mag Meter
Insertion-Style Mag Meter
  • Line Sizes: 12″ – 120″ (300-3000 mm)
  • Pressures: 230 PSIG (16 barg)
  • Temperatures: 160 °F (70 °C)
  • Process Connections: ANSI or DIN Flanges
  • Accuracy: ±2.5%
  • Outputs: Pulse, 4-20mA, RS485, HART
  • Special Features:
    Insertion meter designed for large pipes
  • Approvals: CE
  • Display Types: Integral and Remote

How does a magnetic flow meter work?

electromagnetic flow meters
electromagnetic flow meters

Magnetic flow meters use a magnetic field to generate and channel liquid flow through a pipe.

A voltage signal is created,

when a conductive liquid flows through the flowmeter’s magnetic field.

The faster the flow of the fluid,

the greater the voltage signal generated.

Electrode sensors located on the flow tube walls pick up the voltage signal,

and send it to the electronic transmitter,

which processes the signal to determine liquid flow.

Let see the video about:

How to Measure Flow with Magnets – (Magnetic Flow Meters)

What is the operating principle of a magnetic flow meter?

Faraday’s Law

The operation of a magnetic flow meter or mag meter is based upon Faraday’s Law,

which states that the voltage induced across any conductor,

as it moves at right angles through a magnetic field,

is proportional to the velocity of that conductor.

Faraday’s Formula

Faraday’s Law

E =V x B x D

E = The voltage generated in a conductor

V = The velocity of the conductor

B = The magnetic field strength

D = The length of the conductor

To apply this principle to flow measurement with a magnetic flow meter,

it is necessary first to state that the fluid being measured,

must be electrically conductive for the Faraday principle to apply.

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).

In the case of wafer-style magnetic flow meters,

a magnetic field is established throughout the entire cross-section of the flow tube.

If this magnetic field is considered as 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.

Magnetic flow meter advantages and disadvantages

Advantages of using Electromagnetic Flow Meters

The main advantages of using mag meters,

is that they require less maintenance,

and can be ordered for very large line sizes.

Some can be installed with a simple hot tap which does not require shutting down the line.

Mag meters also have the benefit of adding a level of trust for consumers:

they hold the service provider accountable for the actual water,

being produced and/or billed.

These efforts will assist with the preservation of our water resources

while improving profitability for the utility.

Disadvantages of using Magnetic Flow Meters

It depends on the meter itself. Some flow tube meters have a liner,

which can separate from the meter causing system damage and requiring maintenance.

Look for a meter that does not require a liner,

such as Sino-Instrument Ultra Mag flanged magnetic meter,

with an NSF-approved, fusion-bonded epoxy liner: the Ultra Liner.

Mag meters don’t work on nonconductive fluids such as oils, steam or gas.

Magnetic flow meter diagram

magnetic flow meter diagram
magnetic flow meter diagram

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 remote display?
  • Do you require an analog output?
  • What are the minimum and maximum flow rate for the flow meter?
  • What are the minimum and maximum process pressure?
  • What are 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?

If you have question about Magnetic flow meter,

Please contact us, our engineer will offer help.


Summary
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Author Rating
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Aggregate Rating
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Brand Name
Sino-Instrument
Product Name
Magnetic Flow Meters
Price
USD 500
Product Availability
Available in Stock

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