The magnetic stirrer uses the principle of magnetic field and vortex. The container of the liquid to be stirred which is sunk into the stirrer is placed on the base of the magnetic stirrer. When the magnetic stirrer is energized, a rotating magnetic field is generated near the base to drive the stirring. The child circulates in a circular motion, and a vortex is formed in the liquid in the container to achieve the purpose of stirring the liquid.
At present, there are mainly two types of agitators used in the laboratory: electric agitators and magnetic agitators, wherein the magnetic agitators are suitable for liquid or solid-liquid mixtures with little viscosity. Compared to electric mixers, magnetic stirrers have the following advantages:
1, using high-quality DC motor, low noise, stable speed;
2. The stirrer made of high-quality magnetic steel coated with PTFE, heat-resistant, wear-resistant and corrosion-resistant;
3. The mixing work can be carried out in a closed container, which is very ideal and convenient to use;
4, the system can be integrated with auxiliary heating equipment, which greatly facilitates the application of mixing and heating at the same time.
A typical magnetic stirrer can have both stirring and heating functions. The effect of stirring: 1) The reactants are uniformly mixed to make the temperature distribution uniform, thereby accelerating the reaction rate or evaporation rate, thereby shortening the reaction time; 2) When heated in a closed vessel, magnetic stirring can prevent bumping. The role of heating: Of course, this function is specific to the application, the temperature controlled by the integrated heater on the magnetic stirrer is generally between room temperature and 100 °C. The simple magnetic stirrer has only a stirring function.
Germany IKA digital heating magnetic stirrer 15L 1500rpm 500 °C model 4240400
Second, the principle of selection of magnetic stirrer
In the face of the wide variety of magnetic stirrers on the market, how do we choose? Below, Lebe based on some of his own understanding of this market, talk about the two-point selection principle, for your reference.
1. The principle of necessity
To analyze your own application needs.
1) If only the application of room temperature stirring is required, then a simple magnetic stirrer with only a stirring function can be selected;
2) If stirring and heating are required at the same time, and the temperature requirement is not very strict, select a standard heating magnetic stirrer;
3) If the temperature needs to be displayed in real time during the working process, select the digital temperature heating magnetic stirrer;
4) If you need to set the working time, stop working when the time is up, you can choose the timing magnetic stirrer;
5) If the heating temperature control requirements are strict, you have to choose the water bath collector type magnetic stirrer. The water bath collector type magnetic stirrer is equivalent to the standard type of heated magnetic stirrer. The bottom plate is integrated with a water bath. It is known that water bath heating has the characteristics of uniform heat transfer, precise temperature control and safe heating. Therefore, the water bath collector type magnetic stirrer is especially suitable for applications where the temperature control requirements are strict and the bottom of the container is not flat (such as a flask), which is difficult to be heated from the heating plate. ;
6) If you need to accurately display the real-time speed during the work, select the digital display speed heating magnetic stirrer, but with this speed function, the price of the instrument will be greatly increased. It is recommended to demand demanding research-level occasions or Units with higher budgets choose to use;
7) If the volume of the stirred liquid is large, a large-capacity magnetic stirrer should be selected, and the stirring capacity of the conventional magnetic stirrer is generally 2000 mL or less;
8) If magnetic stirring is required while conventional electric stirring is required, an electric + magnetic composite agitator can be selected;
9) If there are complex requirements for the stirring characteristics, for example, if you turn around for a while, you will reverse for a while, and some time will warm up for a certain period of time to keep warm for a certain period of time, a certain period of time and low speed for a certain period of time. High speed, and so on, you need to customize the intelligent program to control the magnetic stirrer, but the integration of so many complicated functions will make the price of the instrument rise sharply. It is only recommended for the most demanding research-grade occasions.
2, the principle of sufficientness
For your own application, choose the most suitable type. Don't buy a blender that is not suitable for some kind of magnetic stirrer, so as not to cause some functions to be idle and waste, only the best is the best. of.
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