Precise & Protective

Posts tagged ‘Magnetic Stirrer’

Magnetic Stirrers are better than Motorised Stirrers

A magnetic stirrer is a device that employs a rotating magnetic field to cause a stir bar immersed in a liquid to spin very quickly, thus stirring it. The rotating field can be created either by setting some stationary electromagnets or by a rotating magnet, placed beneath the vessel with the liquid.

Working principle of Magnetic Stirrer

The magnetic stirrers work on the principle of using an external magnetic field for mixing the solutions. The external magnetic field rotates a small magnetic bar that has been placed in the desired mixture. Unlike the conventional process of stirring or mixing liquids where the action is externally generated and usually mixing blades are used, magnetic stirring is accomplished by a coated magnet immersed in the sample container. The configuration of the immersed magnet can be that of a bar, oval, pellet or egg. The configuration of the magnet reportedly depends on the size and configuration of the sample container.

History of Magnetic Stirrer

The magnetic stirrer is also known as magnetic mixer and it is invented by Arthur Rosinger of Newark, New Jersey, USA. He obtained the US Patent 2,350,534, titled Magnetic Stirrer on 6 June 1944 that included a brief description of his invention.

The first multi-point magnetic stirrer was developed and patented by Salvador Bonet of SBS Company in 1977. He also introduced the practice of noting the denomination of stirring power in “liters of water”, which is a market standard today.

Advantages of Magnetic Stirrer

  • It minimizes the risks of contamination over conventional stirring or mixing systems since it only uses a stir bar or coated immersed magnets (also called ‘fleas’) that are chemically inert. These fleas can be easily cleaned and disinfected as compared to the more laborious cleaning and disinfecting steps involved in cleaning and disinfectant processes of mixing tools with complex configurations.
  • Also, they don’t require any kind of lubricants for the mixing process. The lubricants generally could contaminate the reaction vessel and the product as well.
  • It is critical for consistent and reproducible mixing i.e. it can mix the solutions over long time scales. For example: A protein dialysis requires multi-hour or overnight sample mixing. Also, protein dialysis is extremely sensitive to bacterial contamination.
  • Due to the flexible properties, they can also be used inside hermetically closed vessels or systems.
Magnetic Stirrer

WAVEMAX – Orbital Shaker

Why is a magnetic stirrer better than a motorized stirrer for lab purposes?

Magnetic stirrers are the most preferred devices for mixing liquids in chemistry and biological laboratories. It is far better than motorized stirrers because of following properties:-

  • Magnetic stirrers are quieter
  • They are more efficient
  • They don’t have any moving external parts so no fear of breaking or wearing out
  • They can be easily cleaned and sterilized
  • They don’t require lubricants so no fear of contamination during the process

Whereas, one may find these above mentioned difficulties while using motorized stirrers.

Abdos Labware offers magnetic stirrer: Swirl Top

Laboratory Hot Plate

A renowned name in Labware products, Abdos Labtech Pvt Ltd. offers SwirlTop magnetic stirrer with compatible and efficient features:-

  • Swirl Top unit feature an extremely durable, chemical resistant white ceramic work surface.
  • Swirl Top has advanced microprocessor control with convenient turn knobs that allow quick, precise adjustment and maintains accurate temperature and speed.
  • Swirl Top is compatible with a wide variety of popular glass beakers, flasks, bottles and vessels.
  • E11215 comes complete with support rod for mounting thermometers and temperature probes.

For a detailed information about the voltage, frequency, dimension, weight e.tc, please visit http://www.abdoslabware.com/wavemax-rocking-shaker.html

For a wide range of other Labware products and equipment, log on to http://www.abdoslabware.com/

We as team want to serve the scientific fraternity through our quality product and services. Maintaining the quality assurance, Abdos always look forward to create more-n-more plastic Labware products that make the lab work easier and efficient.

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Hot Plates- a friendly lab-ware

Hot plates are a common sight in many kitchens but their uses and advantages go beyond that!

A hot-plate (http://en.wikipedia.org/wiki/Hot_plate) is nothing but a portable self-contained tabletop small appliance which has two or more electric heating elements for heating. They also come with gas burners.

As the name suggests, these hot plates can be used as a standalone appliance. In many households, these are commonly used as a substitute for burners either from an oven or a stove. So next time if a kitchen stove is not or convenient for use, the hot plates can serve your purpose. You can indeed use them for cooking as they are extremely portable that is a great advantage during house parties. You can use them for sauté work or desserts on a table side or a buffet.

Magnetic Stirrer

Laboratory Hot Plate

For laboratorial settings and practices, these hot plates are usually used for heating glassware and the content in it. Some of them also contain a magnetic stirrer that automatically stirs the heated liquid in the glassware.

These are extremely useful in lab works because baths can be hazards if they spill, overheat or ignite. The main advantage of the hot plates is the cost. They are available at a very low cost in the market which allows them to be the most used appliance in this developing world. Those who have a limited budget, please do not worry, the most considered appropriate technology is here- hot plate. It is extremely pocket friendly and comes within the budget.

Working of a hot plate

It provides heating by using a disposable butane fuel cartridge. Usually after sparking an igniter, the hot plates will burn for 1.5 hours approx.

Advantages

  • It is possible and easy to heat stuff with disposable gas
  • It is available in larger sizes as compared to the induction cookers

Disadvantages

  • Check for the surfaces as they can get very hot at times
  • The generated heat takes time to adjust

Safety comes first

It is a known fact that safety is always good. You should keep some safety tips in mind while using a hot plate:-

  • Before heating content in a bath, check for the glassware’s heat resistance, cracks. Also, do remember that do not put any glassware on the plate directly. Apart from this, make sure that the surface of the hotplate is always larger than the vessel being heated.
  • Add boiling stones while bringing the liquids to boil. This will help in facilitating the process.
  • Do not condense any content/ material in a vessel until and unless it is completely dry. Even a single drop of moisture can eventually crack your vessel.
  • For heating liquids, a smart idea would be to set the temperature at medium or medium high setting.
  • Do not heat a metal plate on a hot plate as this can damage the appliance and often poses a shock risk.
  • Always use tongs or any rubber coated, heat resistant gripping devices while removing any object from a hot plate. This goes for pouring hot liquids too.
  • It is advisable not to store any flammable or volatile materials in the vicinity of a hot plate. Also, it is best to chuck out an old and worn-out hot plate for flammable materials.
  • Before using a hot plate, check carefully for corrosions in order to avoid any spark hazard.
  • Last but not the least, always remembers to turn it off after using.

Taking Care of your hot plate

  • A general cleaning way for your hot plate is to wipe the exterior surfaces with a piece of cloth dampened slightly. You can use a mild soap solution.
  • Do not use a vinegar solution for cleaning as it is just a myth.
  • Always keep the hot plate in cool and dry place. Try to avoid it from moisture as to keep it away from corrosion and rust.

As mentioned earlier, the hot plates can be a good companion in lab works and in daily use as they come at a very reasonable price as compared to other heating appliances. You just have to take good and proper precautions and care for it.