Magnetic stirrers are important in laboratories. They are used in chemistry, microbiology, biotechnology, pharmacy and medicine. They move a stirring bar in liquids with a rotating magnetic field. Magnetic stirrers are quieter and more efficient than mechanical stirrers. They require little maintenance.
Magnetic stirrers are suitable for aqueous solutions and media with a low viscosity of up to 100 mPa. The best speed is usually between 400 and 800 rpm. There are many types of magnetic stirrers, such as analog and digital, multi-position stirrers and special ones for cell cultures.
For magnetic stirrers often require glass vessels or containers made of non-magnetizable materials. The stirring bars are small and easy to clean. For example by autoclaving or alcohol treatment. The length of the rod should be 2/3 of the diameter of the base of the vessel.
Magnetic stirrers are available in many sizes and designs. The plate sizes range from 100 x 100 mm to 500 x 500 mm. Some models can heat the plates up to 500°C. An external temperature sensor can be connected for precise temperature control.
Important findings
- Magnetic stirrers use a rotating magnetic field to move stirring rods in liquids
- They are quieter, more efficient and require less maintenance than mechanical stirrers
- Magnetic stirrers are suitable for aqueous solutions and media with a low viscosity of up to 100 mPa
- The optimum speed for common applications is between 400 and 800 rpm
- Magnetic stirrers are available in various sizes, designs and with optional heating function
- Stirring bars can be easily cleaned and disinfected
- Magnetic stirrers are used in chemistry, microbiology, biotechnology, pharmacy and medicine
What are the technical specifications of a magnetic stirrer?
When choosing a magnetic stirrer for the laboratory, the technical data is very important. They ensure that the device works well and is suitable for the experiments. There are many different magnetic stirrers that differ in size, heating power and stirring capacity.
Which heating plates are available?
Magnetic stirrers often have heating plates that heat the liquids evenly. The size of the heating plate varies depending on the model. Some are around Ø 13.5 cm, others are larger for difficult tasks.
Some models also have rectangular heating plates. This makes it easier to use different containers.
How many watts does a professional magnetic stirrer need?
The wattage of a magnetic stirrer depends on its size and requirements. Professional magnetic stirrers usually require around 18 watts. However, there are also models with more watts that are faster and more efficient.
How large should the diameter (ø) of the stirrer be?
The diameter of the magnetic stirrer is very important. A larger diameter allows more liquid to be stirred. The diameters range from around Ø 80 mm to Ø 145 mm, depending on the model.
Which temperature control (°C) is suitable for my medium?
Temperature control is very important, especially when heating is required. Magnetic stirrers can reach temperatures of up to 120 °C or even 500 °C. You have to choose the right temperature range for the medium.
Important technical features of magnetic stirrers
| Feature | Feature Description |
|---|---|
| Maximum capacity | The maximum stirring capacity of a magnetic stirrer can range from 0.25 liters to 150 liters, depending on the model. |
| Stirring speed | The stirring speed is specified in revolutions per minute (rpm) and is typically between 100 and 1500 rpm. |
| Heating capacity | The heating power of a magnetic stirrer with heating function is specified in watts and influences the heating time and maximum temperature. |
| Connection | Magnetic stirrers are usually operated with 230 V / 50 Hz, but there are also models for other mains voltages and frequencies. |
| Dimensions | The size of the magnetic stirrer is important for placement in the laboratory and compatibility with existing equipment and work surfaces. |
If you pay attention to these technical features, you can find the best magnetic stirrer for your laboratory. This will make your experiments more efficient and successful.
How does heating work with magnetic stirrers?
Magnetic stirrers with a heating function, also known as heating stirrers, heat liquids evenly. The heating plate is made of glass ceramic or stainless steel. They can reach up to 300°C.
Modern models have a microprocessor-controlled temperature regulator. This ensures precise temperature control.
What advantages does a hotplate offer when stirring?
A mixer with a heating plate has many advantages:
- Constant temperature control thanks to self-optimizing algorithms
- Increased safety when working with flammable liquids
- Uniform heating and mixing of the medium
- Avoidance of boiling delay due to continuous stirring
- Easy handling and cleaning of the stirring rods (usually PTFE-coated)
How effective is the heating function with different liquids?
The efficiency of the heating function depends on various factors. These include the type and quantity of liquid and the target temperature. Modern heating stirrers are energy-efficient.
For example, they can bring 200 ml of water to the boil in 13 minutes. An external temperature sensor (e.g. PT-1000) is recommended for precise temperature monitoring. It enables fast and precise control.
| Liquid | Volume | Target temperature | Heating time (approx.) |
|---|---|---|---|
| Water | 200 ml | 100°C | 13 minutes |
| Ethanol | 100 ml | 78°C | 8 minutes |
| oil | 150 ml | 180°C | 15 minutes |
Magnetic stirrers with heating function are efficient and safe. They are suitable for many applications in chemical research.
What accessories are required for a magnetic stirrer?
To make good use of a magnetic stirrer, you need the right accessories. In addition to the magnetic stirrer are magnetic stirring rods and a suitable container are very important. They help to work efficiently and accurately in the laboratory.
What types of stirring rods (PTFE, stainless steel) are recommended?
Magnetic stirring rods are available in many shapes and sizes. The choice depends on the liquid and the purpose. PTFE stirrers are often the best choice because they are heat-resistant and easy to clean.
Stainless steel swabs are better suited for high temperatures and aggressive chemicals. There are different shapes such as cylindrical, oval and triangular. The size should match the liquid and viscosity.
A magnetic stick remover is also useful. It helps to remove the rod after stirring. It consists of a long magnetic rod coated with PTFE.
How do you choose the right container (beaker, round bottom flask)?
The choice of container depends on the liquid and the temperature. Beakers and round bottom flasks made of borosilicate glass are often the best choice. They are heat-resistant and easy to clean.
The size of the container should match the amount of liquid and the size of the magnetic stirrer. Containers that are too small can lead to overflowing. Too large can reduce efficiency.
| Container | Recommended volume | Typical application |
|---|---|---|
| Beaker | 50 ml - 5000 ml | Heating, stirring, mixing of liquids |
| Round bottom flask | 50 ml - 2000 ml | Distillation, refluxing, reactions under reflux |
With the right accessories such as magnetic stirring rods magnetic rod removers and suitable containers, you can achieve a lot. This makes laboratory work efficient and precise.
How do I choose the right magnetic stirrer for my laboratory?
Many factors are important when choosing a magnetic stirrer for your work. A laboratory stirrer must be powerful and reliable. It should also be tailored to your needs.
Think about the size of the stirring plate the stirring volume and the stirring speed.
What should I look for when choosing a manufacturer?
Choose a manufacturer that offers quality and experience. Brands such as IKA, Heidolph or Stuart are known for their laboratory accessories . They guarantee a long service life and precise results.
Also look out for good customer service and a comprehensive guarantee. This means you can get help quickly in an emergency.
How do the models differ in terms of stability and application?
Magnetic stirrers differ in terms of design and features. Robust materials such as stainless steel or aluminum ensure stability. Non-slip feet help to stabilize the stand.
Additional functions such as a heating plate or temperature control are useful. For difficult stirring tasks Magnetic stirrer laboratory -models with high speeds and a strong magnetic field are ideal.
| Criterion | Recommendation |
|---|---|
| Stirring plate | Adapt size to stirring volume |
| Stirring speed | Depending on the medium, up to 2,000 rpm |
| Heating function | For applications with temperature control |
| Accessories | Select suitable stirring rods and vessels |
When selecting a magnetic stirrer, you should always consider the specific requirements of your application. Thanks to the large selection, you are sure to find the perfect stirrer for your work. It will provide reliable results and high efficiency.
How does stirring liquids with a magnetic stirrer work?
Magnetic stirrers are great for mixing liquids. They consist of a heating plate with magnets and a stirring fish. They were developed by the American chemist Arthur Rosinger in 1944. chemical stirring in laboratories around the world.
What are magnetic stirring bars and how are they used?
Magnetic stirring bars, also known as stirring fish, are small magnets with a Teflon or ceramic coating. They are placed in the container and moved by the magnetic field. This mixes the liquid thoroughly.
Stirring fish are available in different sizes. This allows you to achieve the best turbulence for every project.
Which medium is best suited for stirring?
Magnetic stirrers can quickly stir any liquid, except very viscous ones. They are great for aqueous solutions and acids. A magnetic stirrer with a shaft is used for thicker media.
Chemically inert stirring bowls and vessels made of glass, Teflon or ceramic are safe for aggressive chemicals.
How is the temperature controlled during stirring?
Many magnetic stirrers have a heating plate for precise temperature control. This is safer than heating over a Bunsen burner flame. The combination of magnetic stirrer and heating plate has been an important workhorse since the 1940s.
| Application | Recommended stirrer size | Optimum speed |
|---|---|---|
| Stirring in small vessels (up to 50 ml) | 1.5 - 10 mm | 800 - 1,200 rpm |
| Standard applications (50 - 1,000 ml) | 20 - 50 mm | 400 - 800 rpm |
| Stirring in large vessels (from 1,000 ml) | 60 - 80 mm | 200 - 400 rpm |
| Stirring highly viscous liquids | 80 - 160 mm (stirring paddles with shaft) | 100 - 200 rpm |
What applications are there for magnetic stirrers?
Magnetic stirrers, also as laboratory mixers are versatile. They are used in chemical, microbiological, biomedical and pharmaceutical laboratories. They are particularly useful for stirring liquids in sealed containers.
Where are magnetic stirrers used in laboratories?
Magnetic stirrers are used in the industrial research sector and in laboratories for product development. They are suitable for mixing materials such as industrial adhesives, coatings, paints and solvents. They are used in professional laboratories and schools.
How can you use different vessels?
Magnetic stirrers are flexible in terms of the vessels used. They are suitable for beakers, round bottom flasks and special reaction vessels. The choice depends on the liquid, the volume and the temperature resistance.
With the right stirring rods, any vessel can be adapted for magnetic stirrers. Stirring rods are available in materials such as PTFE or stainless steel.
What are the advantages of a heating stirrer compared to a standard stirrer?
Heating stirrers combine heating and stirring functions. They enable precise temperature control, which is important in chemistry and biotechnology. They have heating capacities of up to 1000 watts and temperature ranges of up to 400°C.
Heating stirrers are suitable for demanding stirring tasks. They ensure constant stirring with volumes of 5-20 liters. This makes them an important tool in laboratories.
For useful samples such as cell and tissue cultures, a stirrer without heating is better. It has a slow stirring speed and can be used in incubators and cold rooms. Magnetic stirrers increase efficiency and precision in the laboratory and achieve reproducible results.
How to clean a magnetic stirrer properly?
It is important to clean a magnetic stirrer regularly. This keeps it working efficiently and makes it last longer. A clean laboratory stirrer ensures accurate results and prevents the transfer of dirt.
Which materials are ideal for cleaning?
Special materials are required for cleaning. These include:
- Microfiber cloths or soft cloths
- Mild cleaning agents such as soap solution or isopropanol
- Soft brushes or cotton buds for difficult areas
- Gloves to protect against chemicals
How often should cleaning be carried out?
How often you clean depends on the use and the media. As a rule:
- After each use: remove residues
- Weekly: Thorough cleaning
- Monthly: Deep clean and check
Are there special cleaning instructions for different manufacturers?
The cleaning steps are often similar, but the manufacturer has its own instructions. It is important to follow the manufacturer's instructions. Some manufacturers offer special cleaning solutions.
| Manufacturer | Recommended cleaning agents | Special features |
|---|---|---|
| IKA | Mild soap solution, isopropanol | Avoid abrasive cleaning agents |
| Heidolph | Neutral cleaner, 70% ethanol | Special cleaning brush included |
| Thermo Scientific | Mild cleaning agent, distilled water | No immersion baths for electronic components |
With the right care and regular cleaning, your magnetic stirrer will remain ready for use for a long time. It delivers reliable results in the laboratory and in research.
Why are heating stirrers ideal for certain applications?
Heating stirrers are very important in the laboratory. They can stir and heat. This makes them an efficient solution for many processes.
How do heating stirrers combine the functions of heating and stirring?
Heating stirrers have a heating plate and a magnetic stirring rod. The heating plate heats up evenly and the stirring rod moves the liquid. This allows reactions to take place more quickly and substances to be dissolved better.
What are the advantages of stirring chemicals with a heating function?
Stirring with a heating function has many advantages:
- Chemical reactions become faster due to the heat.
- Substances dissolve better due to uniform heating.
- Hotspots and overheating are avoided by mixing.
- It is safer as no open flames are required.
For which vessels are heating stirrers best suited?
Heating stirrers are suitable for many vessels:
| Type of vessel | Suitability | Advantages |
|---|---|---|
| Beakers | Very good | Good heat transfer, easy handling |
| Erlenmeyer flask | Bowl | Larger volume, good mixing |
| Round bottom flask | Conditional | Good heat transfer, but difficult to position |
The heating plate is important when selecting the vessel. Glass ceramic is particularly resistant and good for aggressive media.
Heating stirrers are very useful in the laboratory due to their versatility and efficiency. They make work easier, speed up processes and make working with chemicals safer.
Which liquids can be stirred with magnetic stirrers?
Magnetic stirrers are great for stirring in laboratories. They work well with liquids with a lower viscosity, such as water. They allow you to precisely control the stirring speed and temperature.
Which media are best suited for magnetic stirrers?
Magnetic stirrers are great for low-viscosity media such as water and alcohol. They are also great for dissolving salts and powders. They can even work gently with sensitive samples.
How does the volume of the liquid influence the choice of stirrer?
The volume of the liquid is important for the choice of magnetic stirrer. Compact tabletop stirrers are suitable for small quantities of up to a few liters. For larger quantities, more powerful devices are required.
| Volume | Recommended magnetic stirrer |
|---|---|
| up to 1 liter | Compact tabletop stirrer |
| 1 to 5 liters | Laboratory stirrer with stronger magnetic drive |
| over 5 liters | Industrial magnetic stirrer with high power |
Can viscous liquids also be stirred with magnetic stirrers?
Magnetic stirrers are mainly suitable for liquids with a low viscosity. However, they can also be used to stir viscous media. If the viscosity is too high, you should start slowly and increase the speed.
How can magnetic stirrers be used in laboratory technology?
Magnetic stirrers are useful in many applications. They mix liquids and suspensions in sealed containers. They are indispensable in chemistry and biology laboratories.
Applications for magnetic stirrers in laboratories
Magnetic stirrers can mix many things. They are suitable for adhesives, paints and solvents. They can be customized by using different stirring rods.
Increasing efficiency with magnetic stirrers
Magnetic stirrers make laboratory work more efficient. They are quieter and save energy. They require hardly any maintenance.
You can set the temperature and speed precisely. This saves time and resources.
Magnetic stirrers in chemical research
Magnetic stirrers are very important in chemical research. They help to heat and stir reaction mixtures. This is important for many syntheses.
Reactions can be precisely controlled. This improves the yield. They are also used in the production of nanoparticles and polymers.
Frequently asked questions
Which heating plates are available for magnetic stirrers?
There are rectangular heating plates in sizes from 100 x 100 mm to 500 x 500 mm. Round heating plates with diameters from Ø 80 mm to Ø 145 mm are also available. The heating plates can be heated to temperatures from 120 °C to 500 °C.
What accessories are required for a magnetic stirrer?
Important accessories are the magnetic stirring rod and the magnetic rod remover. A suitable container such as a round bottom flask or a beaker is also required. The stirring rods are provided with a chemically inert coating.
How do you choose the right magnetic stirrer for your laboratory?
It is important to have a suitable stirring plate and the stirring volume. The stirring speed also plays a role. Pay attention to the design and suitable liquids. A heating function and the necessary accessories are also important.
How does stirring liquids with a magnetic stirrer work?
A magnetic rotating field moves the magnetic stirring rod in the liquid. The stirring rods are provided with a coating. This transfers the movement to the medium. The temperature can be adjusted using a heating plate.
Where are magnetic stirrers used in laboratories?
Magnetic stirrers are used in chemical, microbiological, biomedical and pharmaceutical laboratories. They stir liquids in hermetically sealed containers. This is important in industrial research and product development.
Which liquids can be stirred with magnetic stirrers?
Magnetic stirrers are suitable for aqueous solutions with low to medium viscosity. They are good for chemical, biological and microbiological applications. Other stirring methods are required for higher viscosity liquids.
How does the use of magnetic stirrers improve efficiency in the laboratory?
Magnetic stirrers are quieter and more efficient than mechanical stirrers. They require little to no maintenance. They stir liquids in sealed containers, which minimizes sample contamination.
