There are a great variety of stirrers available for laboratory use, and a magnetic stirrer is one of the most commonly used stirring equipment. It is frequently used in chemical, food, pharmaceutical, cosmetics, environmental protection and other fields. So what a magnetic stirrer is and why it is used?
Definition of a Magnetic Stirrer
A magnetic stirrer is a laboratory device that can create a rotating magnetic field so that the liquid can be stirred automatically and quickly by a magnetic stirring bar. It generally plays a key role in minimizing the risk of contamination since there is only an inert magnet bar that is placed inside the liquid sample. Hence, it can be used in many fields, such as food industry, chemical industry as well as biological field. But the magnetic stirrers are not suitable for stirring large volumes and high-viscosity substances and can only be used in relatively small experiments.
Types of Magnetic Stirrers
There are many types of magnetic stirrers. In addition to the functions of stirring and heating, the equipment is generally equipped with other functions as well, such as temperature control and timing. Magnetic stirrers are often classified in terms of the additional functions, including magnetic stirrers, heating magnetic stirrers, constant temperature heating magnetic stirrers, digital display temperature control magnetic stirrers, constant temperature timing magnetic stirrers, two-way magnetic heating stirrers, plate-type strong magnetic stirrers and other types. Each type of magnetic stirrer has its own features, and they can be used in most of stirring reactions. It can be regarded as one of reasons why a magnetic stirrer is used. But in order to get an ideal experimental effect, people should have a great understanding of each of magnetic stirrer and choose a more appropriate one based on experimental requirements.
What is Magnetic Stirrer with Hot Plate?
The magnetic stirrer with hot plate is also a kind of magnetic stirrer, which is known as the hot plate magnetic stirrer as well. The magnetic bar can be immersed in the liquid to provide the stirring action. The magnetic stirrer with hot plate can keep liquids being stirred automatically as they are heated for a faster reaction.
Why is a Magnetic Stirrer Used?
A magnetic stirrer is primarily used for dissolving, heating, and mixing in pharmaceutical, food and other industries. Specially speaking, there are mainly three uses. Firstly, it can make reactants mix evenly and temperature distribute uniformly. Secondly, it can be used to prevent bumping when heating in a closed vessel. Thirdly, it can be used to speed up the reaction or evaporation and thus shorten time.
Compared to original stirrers, a magnetic stirrer has more advantages, as follows:
- The magnetic stirrer adopts high-quality DC motor, with a low noise and stable speed regulation.
- The fully enclosed heating plate can be used for auxiliary or long-term heating.
- The stirrer made of PTFE and high quality magnetic steel is high temperature , abrasion, and chemical resistant, and it has a strong magnetism.
- It is ideal and convenient to use a magnetic stirrer for mixing materials.
- The magnetic stirrer can set and display temperature, and the temperature display is intuitive and accurate. It can be used for heating for a long time.