A magnetic stirrer is an instrument meant for creating rotating magnetic field. It consist of small bar magnet and a stand or plate containing rotating magnet. The bar magnet is normally coated with plastic whereas, plate contains rotating magnet. The rotating magnet is responsible for creating rotating magnetic field.
How It Works?
The bar magnet is placed in a vessel containing liquid which is to be stirred. At the top of the stand, vessel is set where the rapidly rotating magnetic field causes the bar magnet to rotate, which results in the stirring of the liquid. Due to its small size magnetic stirrer is preferred in laboratory experiments.
on the size, configuration and applications, magnetic stirrer is of following types:
Magnetic Mini Stirrer
Mini magnetic stirrers is a compact size stirrer that occupy less space and consist of electronic controls that allow the user to regulate the speed with greater precision. It is resistive to harmful chemicals in the lab. The speed regulator in the instrument ensure that the maximum speed is never exceeded.
Magnetic Stirrer with Timer
Magnetic stirrer with timer automatically shut off the motor after the selected amount of time. A built-in timer will shut the stirrer off when the pre-selected period of time has passed. The speed is automatically reduced even the load is automatically removed.
Heavy-Duty Magnetic Stirrers
The heavy duty magnetic stirrer have good chemical resistance, highly durable and have high mixing capacity. They are perfect instrument for laboratory use as well as use in production. There is an internal electronic control device that regulates the speed automatically with respect to load.
Battery Powered Magnetic Stirrer
They are use where there are no electric outlets. They are mainly used in incubators and consist of rubber feet, speed control knob, etc. The batteries used for their operation are either alkaline
batteries or rechargeable type batteries.
Air Operated Turbine Magnetic Stirrer
Air operated turbine magnetic separator is ideal equipment for stirring liquid upto one liter. The separator uses low pressure air supply to power this magnetic stirrer. The important aspect of that magnetic stirrer is that, it eliminates the sparking hazard from electrical sources.
Magnetic stirrer finds applications in the following areas:
For stirring volatile solutions.
Magnetic stirrer is used in lab to work with different solutions.