A magnetic stirrer or magnetic mixer is a laboratory device that employs a rotating magnetic field to cause a stir bar or flea immersed in a liquid to spin very quickly thus stirring itThe rotating field may be created either by a rotating magnet or a set of stationary electromagnets placed beneath the vessel with the liquid.
An overhead stirrer and impeller has many advantages with highly viscous samples over a magnetic stirrer however a magnetic stirrer is often much cheaper and has the option of including heating within the plate and the advantage of numerous designs of stir bars to produce differing amounts of shear stress.
Barnstead Cimarec Magnetic Stirrer S131435A direct drive motormagnet system provides quiet and strong magnetic coupling ensuring that the stir bar stays locked with the drive magnet even in viscous solutionsAdjustable speed control is optimized through microprocessorcontrolled feedback.
Camlab have a good choice of overhead stirrers for most applicationsThe type and choice of accessories is really determined by the size and viscosity of the sampleThe larger the product and the more viscous it is the more powerful the stirrer with more torque to move the paddle through the liquid at an even rate.
Dec 24 2020nbsp018332At less than five inches in diameter the Apera Instruments 801 around 58 is a compact model with a basic designIts simple to operate capable of speeds up to 2300 revolutions per minute and comes with 30 35 and 45millimeter stir bars.
Feb 25 2021 Magnetic Stirrers vs Overhead StirrersAside from magnetic stirrers the samples can be mixed using motor power overhead stirrersThe overhead stirrers can handle larger volumes of liquid samples andor high viscous liquidsMagnetic stirrers on the other hand can mix samples in a sealed container and samples can be heated more.
Feb 25 2021nbsp018332Magnetic Stirrers vs Overhead StirrersAside from magnetic stirrers the samples can be mixed using motor power overhead stirrersThe overhead stirrers can handle larger volumes of liquid samples andor high viscous liquidsMagnetic stirrers on the other hand can mix samples in a sealed container and samples can be heated more evenly by.
For most other applications involving viscous materials an overhead mixer fitted with an appropriate impeller will be requiredWhen choosing a stirrer you’ll want to be sure that it’s capable of providing the power needed to stir the viscous materialYou’ll also want to know whether it will be compatible with your chosen impeller more on those next.
Heidolph™ HeiTec Magnetic Stirrer HotplatesHotplate for smooth to intense mixing and heating of lowviscosity fluidsAn excellent choice for decomposing organic and inorganic substancesCorning™ Economical LargeCapacity StirrerStir large volumes of liquid with ease.
In an FDA approved PTFE coatingIn addition magnetic stir bars also use high energy magnetic materials such as Samarium Cobalt which increases strength of coupling with a drive magnet and helps to reduce spinout when mixing viscous solutions or mixing at high speedsVWR174 MAGNETIC STIR BAR SELECTION GUIDE Magnetic Stir Bar Slowly Increasing.
Jan 28 2015nbsp018332Unless your reaction is very large or very viscous a magnetic stir bar requires much less time to set up and clean compared to a traditional mechanical stirrer1 begingroup I have repaired several cheap stirring hotplatesThe problem was that they were made with bad glue that eventually wore out.
Jun 06 2019nbsp018332For example for highly viscous materials an overhead mixer with a paddle could be a good option whereas there is no similar alternative for a magnetic stirrerIn general overhead stirrers are more versatile due to the vast number of impeller options available plus the fact that you can alter the position of the impeller head.
Magnetic lab stirrers are the dependable goto equipment for industry standard precision stirring and mixingAn advanced brushless motor spins the stirring bar even in viscous solutionsEasy fingertip controls allow for convenient control of the stirring plate’s temperature and direction.
Catalog Number 4420809 Limited time offersDescription Robust magnetic stirrer with hermetically sealed stainless steel housing suitable for highly viscous mediaOperating temperatures up to 50 176C.
Equipment showcases a complete line of hotplate stirrers effectively designed to deliver reliable mixing for various chemical and biological applicationsBuilt for smooth and highperformance mixing of viscous and nonviscous liquid samples these compact hotplate stirrers are big in features — with some units offering.
Magnetic stirrers are designed for generalpurpose laboratory use in routine mixing applicationsCorning™ Pyroceram™ Top Magnetic StirrersAs we have seen above overhead stirrers should be used with less viscous fluids to prevent overheatingVP 706F3 MidiStirrus Horizontal Magnetic Stirrer.
Mar 15 2016nbsp018332The high end of the price range for magnetic stirrers is the price entry point for overhead stirrers with the sweet spot for laboratories in the 1000–5000 rangeOverhead designs provide significantly higher mixing stirring capability greater volume capacities and stronger agitation for processes involving highly viscous liquids.
May 14 2018nbsp018332When dealing with viscous materials a magnetic stirrer is unlikely to get the job doneThe resistance to movement of the stir bar caused by viscous materials prevents the bar from spinning rapidly.
Nov 20 2018nbsp018332Magnetic stirrers use a rotating magnetic field to move a stir bar around in liquid samplesThe movement of this stir bar mixes the sample thoroughly with rapid movement and agitationHowever if your liquid is more viscous and you don’t need the extra capacity that overhead stirrers offer a magnetic stirrer is a better choice since.
Oct 05 2021nbsp018332If your fluid has more viscosity and does not require the additional capacity provided by overhead stirrers a magnetic stirrer is a better alternative because it doesn’t overheat as easilyAs we have seen above overhead stirrers should be used with less viscous fluids to prevent overheatingOn the other hand magnetic stirrers cannot be.
Stirring lowviscosity materials is typically very straightforwardFor smaller amounts a magnetic stirrer can provide a lowcost and effective optionOverhead stirrers can easily get the job done for virtually any batch size with the right impeller attached.
Techne ColeParmer 900W this stirrer unit will boil 1 litre of water over 30 faster than a conventional ceramic hotplate of 1200WRare earth magnets give powerful stirring of up to 15 litres with feedback control from 100 to 1500rpmThis highly efficient stirrer hotplate is ideal when large volumes of liquid.
The magnetic stirrer PCEMSR 450 is a stirring instrument for up to 20 litersThe speed of the magnetic stirrer can be adjustedIt is possible to set speeds between 200 and 2200 revolutions per minuteMotor brushless DC motor BLDC Number of stirring points 1.
The magnetic stirrers available at Omega have been engineered to operate for hours or even continuouslyAnd their sealed exterior design keeps any spills away from internal components for worry free operationSet the rotation of the stirring bar temperature and stir time – creating consistent mixtures and product every time.
The multifaceted magnetic stirring bar surface adds turbulence relative to similar size smooth cylindrical stirring barsFisherbrand™ PTFE Stirring Bar RetrieverFisherbrand™ Octagonal Magnetic Stir Bar Kit.
This Thermo Scientific174 ELED Model SafeT S10 ExplosionProof magnetic stirrer requires 120V and is designed with a large ceramic top plate surface of 10 x 10in 254cm to allow maximum sample capacityAccommodates vessels with a capacity of 6L 1Stirring speeds range from 60 to 1200rpm with precise electronic control within 1773rpm.
When dealing with viscous materials a magnetic stirrer is unlikely to get the job doneThe resistance to movement of the stir bar caused by viscous materials prevents the bar from spinning rapidlyThis means it won’t be able to provide the turbulence required for thorough mixingIt can also cause the stir bar to become decoupled from the internal magnet preventing stirring altogether.
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