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    3. Magnetic Stirrer

    Magnetic Stirrer

    A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar (also called "flea") immersed in a liquid to spin very quickly, thus stirring it.


    The rotating field may be created either by a rotating magnet or a set of stationary electromagnets, placed beneath the vessel with the liquid. Since glass does not affect a magnetic field appreciably (it is transparent to magnetism), and most chemical reactions take place in glass vessels, magnetic stir bars work well in glass vessels.

    Magnetic stirrers are often used in chemistry and biology.

    They are preferred over gear-driven motorized stirrers because they are quieter, more efficient, and have no moving external parts to break or wear out (other than the simple bar magnet itself).

    Because of its small size, a stirring bar is more easily cleaned and sterilized than other stirring devices. They do not require lubricants which could contaminate the reaction vessel and the product. They can be used inside hermetically closed tools or systems, without the need for complicated rotary seals.

    Magnetic stirrers may also include a hot plate or some other means for heating the liquid.

    Choosing a Magnetic Stirrer

    A device that can be found in almost every laboratory and is used to mix liquids and solutions in a simple way, without the need for a stir bar.

    -In any laboratory in the life sciences, chemistry can be found magnetic stirrers that are used for mixing of solutions without the need for manual mixing of a laboratory worker.

    -Magnetic stirrer suitable for mixing liquids in tools 4 cm to 40 cm in diameter.

    In small tools such as test tubes or small vials with a diameter of 30-40 mm it will not be possible to stir.

     

    In large tools with a diameter of over 50-60 cm it is not possible to perform an effective stirring that will stir all the liquid in the tool and not just in the center.

     

    Considerations in choosing a magnetic stirrer

    -The first consideration is, what is the volume of the solution you want to stir?

    The larger the amount of liquid, the greater the need for a magnetic stirrer with a large motor and a larger work surface.

    Magnetic stirrers with DC motors are designed for stirring small amounts usually up to a maximum of 1 liter or less, Changing viscosity during stirring
    Will cause their speed to slow down, impair the quality of the stirrer and may cause the engine to burn out.

    For stirring of quantities greater than 1 liter, it is advisable to work with a magnetic stirrer with an AC motor

    Recommended magnets length:
    For stirring 250 ml, a 25 mm long magnet is recommended

    For stirring 600 ml, a 40 mm long magnet is recommended

    For stirring 2 liters, a 60 mm long magnet is recommended

    For stirring 3-10 liters, a magnet with a length of 70 mm is recommended

    For stirring 10-30 liters, a magnet 80 m long is recommended

    magnet for magnetic stirrer

    -The second consideration in choosing the magnetic stirrer is the diameter of the tool in which the liquid is located.

    - The stirring speed is 100-1200rpm. In cases where slow stirring is required, a magnetic stirrer should be selected for a low speed range of 40-200rpm.

    -In places where a large number of tools are mixed, multi-position stirrers of 4,6,10,16 positions are used

    multi-position stirrers

    How a magnetic stirrer works

    The tool with the liquid is placed on the magnetic stirrer, a magnet is thrown into the vessel a magnetic stirrer. Inside the stirrer, there is a motor with a magnet that rotates the
    The magnet inside the vessel without any contact between them.The larger the motor and the larger the magnet length and diameter the larger the amount of liquid can be mixed,
    A magnetic stirrer is not suitable for mixing high-viscosity liquids but only for aqueous liquids.

    -Useful for small volumes up to 8 liters, there are models with extremely powerful engines up to 30 liters

    The manufacturer Fried Electric is the best in quality, performance and reliability and has survivability for many years.
    German AC motor with 3 years warranty for intensive work over days and consecutive weeks, for small and large volumes.

    magnetic stirrer

    MORE ABOUT Magnetic StirrerCLOSE
    59305
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    Type

    RPM

      Magnetic  stirrer,up to 8 Liter, 130x120mm 3
      F-13

      Magnetic stirrer,up to 8 Liter, 130x120mm

      1
      Magnetic  stirrer,up to 8 Liter, 130x145mm
      F-23

      Magnetic stirrer,up to 8 Liter, 130x145mm

      1
      Magnetic  stirrer,up to 8 Liter, 185x175mm
      F-33

      Magnetic stirrer,up to 8 Liter, 185x175mm

      1
      Digital Magnetic  stirrer,up to 8 Liter, 185x175mm
      F-33D

      Digital Magnetic stirrer,up to 8 Liter, 185x175mm

      1
      Stainless Steel  Magnetic  stirrer up to 20  liter of water
      F-33S

      Powerfull Magnetic stirrer up to 20 liter of water

      1
      Digital Magnetic  stirrer up to 20  liter of water
      F-33SD

      Digital Magnetic stirrer up to 20 liter of water

      1
      Magnetic  stirrer,up to 30Liter
      F-43

      Magnetic stirrer,up to 30Liter

      1
      Stainless Steel Magnetic  stirrer,up to 30Liter
      F-43S

      Powerfull Magnetic stirrer,up to 30Liter

      1
      Digital Magnetic  stirrer,up to 30Liter
      F-43D

      Digital Magnetic stirrer,up to 30Liter

      1
      Multimagnetic stirrer 6 places
      F 13-3X2

      Multimagnetic stirrer 6 places

      1
      Multimagnetic stirrer 6 places
      F 13-6

      Multimagnetic stirrer 6 places

      1
      Multimagnetic stirrer 4 places
      F 13-2X2

      Multimagnetic stirrer 4 places

      1
      Multimagnetic stirrer 4 places
      F 13-4

      Multimagnetic stirrer 4 places

      1
      ECONOMY MAGNETIC STIRRER WITH CLAMP
      MOS-120N

      Economy Magnetic Stirrer With Clamp,up to 1.5 Liter

      1
      Magnetic  stirrer,up to 0.8 Liter
      MOS-FLATE

      Magnetic stirrer,up to 0.8 Liter

      1
      Magnetic  stirrer,up to 3 Liter
      MOS-135D

      Magnetic stirrer,up to 3 Liter

      1
      Multimagnetic stirrer 5 places
      MUS-5

      Multimagnetic stirrer 5 places

      1
      Multimagnetic stirrer 10 places 3
      MUSS-10

      Multimagnetic stirrer 10 places

      1
      MUSS-15

      Multimagnetic stirrer 15 places

      1
      Multimagnetic stirrer with heater 10 places 3
      MUSH-10

      Multimagnetic stirrer with heater 10 places

      1
      MagStir Genie, 230V w/o plug
      SI-0301

      MagStir Genie, 230V w/o plug

      1
      MegaMag Genie, 230V w/o plug
      SI-2246

      MegaMag Genie, 230V w/o plug

      1
      MultiMagStir Genie, 230V w/o plug
      SI-3001

      MultiMagStir Genie, 230V w/o plug

      1
      Digital MegaMag Genie, 230V w/o plug
      SI-3246

      Digital MegaMag Genie, 230V w/o plug

      1
      MegaMag Genie LR, 230V w/o plug
      SI-3246L

      MegaMag Genie LR, 230V w/o plug

      1
      QuadMag Genie, 230V w/o plug
      SI-4246

      QuadMag Genie, 230V w/o plug

      1
      Digital QuadMag Genie, 230V w/o plug
      SI-5246

      Digital QuadMag Genie, 230V w/o plug

      1
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