Laboratory Magnetic Stirrer Or Magnetic Mixer
- Product Description
Laboratory Magnetic Stirrer Or Magnetic Mixer
Much of the current magnetic stirrers rotate the magnets by means of an electric motor. This type of equipment is one of the simplest to prepare mixtures. Magnetic stirrers are silent and provide the possibility of stirring closed systems without the need for isolation, as in the case with mechanical agitators.
Because of their size, stir bars can be cleaned and sterilized more easily than other devices such as stirring rods. However, the limited size of the stir bars enables using this system only for volumes less than 4 L. In addition, viscous liquid or dense solutions are barely mixed using this method. In these cases, some kind of mechanical stirring is usually required.
A stir bar consists of a magnetic bar used to agitate a liquid mixture or solution (Figure 6.6). Because the glass does not affect a magnetic field significantly, and most of the chemical reactions are performed in glass vials or beakers, stirring bars function adequately in glassware commonly used in laboratories. Typically, stirring bars are coatedor glass, so they are chemically inert and do not contaminate or react with the system in which they are immersed. Their shape may vary to increase efficiency during stirring. Their size varies from a few millimeters to a few centimeters.
6.2.1 Magnetic stirring
A magnetic stirrer is a device widely used in laboratories and consists of a rotating magnet or a stationary electromagnet that creates a rotating magnetic field. This device is used to make a stir bar, immerse in a liquid, quickly spin, or stirring or mixing a solution, for example. A magnetic stirring system generally includes a coupled heating system for heating the liquid (Figure 6.5).
| Ceramic magnetic stirrer(with heating) | ||||||
| model | Voltage | Speed | plate size(mm) | max temperature | max stirrer capacity (ml) |
Net weight(kg) |
| SH-4 | 220V/50HZ | 100~2000 | 190*190 | 380 | 5000 | 5 |
| SH-4C | 220V/50HZ | 100~2000 | 190*190 | 350±10% | 5000 | 5 |
| SH-4C is rotary knob type; SH-4C is liquid crystal display. | ||||||
