The magnetic stirrer is a laboratory instrument used for mixing liquids, mainly used for stirring or heating at the same time to stir low viscosity liquids or solid-liquid mixtures. Its principle is to use the magnetic field of the same sex repulsion, the principle of opposites attract, the use of magnetic field to promote placed in the container with magnetic stirrer for circular running, so as to achieve the purpose of stirring the liquid.
When using a magnetic stirrer, you will occasionally encounter the case of rotor jumping.
1. It may be the problem of sample viscosity. When stirring a viscous sample, the rotor is easily obstructed, thus skipping. In this case, you can use a low-speed speed first, and then adjust to a high speed after the mixing is more uniform.
2. When the rotor length is close to the diameter of the sample bottle, it is easy to jump at high speed. At this time, you should replace the shorter rotor or a larger diameter sample bottle.
3, if the sample bottle is not put into the magnetic center of the magnetic stirrer bottom plate, or the rotor is not in the magnetic center of the bottom of the sample bottle, it is easy to jump.
The magnetic stirrer has high magnetic requirements, unless there is improper operation, generally speaking, the magnetic stirrer with strong magnetism has fewer cases of skipping. Li-Chen magnetic stirrer chooses strong magnetic high temperature resistant magnet to ensure enough suction and torque, effectively prevent skipping, stirring effect is remarkable, recommended to use.
Because the magnetic stirrer is affected by magnetic field, in order to avoid the magnetic stirrer close to the objects or equipment with magnetic field or can produce magnetic field, which will affect its normal operation, we have to choose the working environment suitable for its normal operation when installing the stirrer:
1, the working room should be kept clean and dry;
2, the instrument should be placed in a horizontal, smooth, flame-retardant and has a certain friction surface. With a certain degree of friction on the workbench;
3, the workbench should be set up in the vibration of less interference;
4, the instrument should be kept away from objects and equipment with a magnetic or magnetic field;
5, shall not be used in the explosive hazardous areas;
6, shall not be used for a long period of time in the high humidity or dusty environment instrument. .
Magnetic stirrer is suitable for chemistry, biotechnology, pharmaceuticals, microbiology and medical fields, used to cultivate microorganisms, dissolve nutrients and solids, etc., is one of the commonly used instruments in the laboratory. In order to prolong the use of magnetic stirrer age, usually should do a good job of maintenance of the instrument, specifically the following points:
1, cleaning, please do not put the electronic equipment in the cleaner;
2, in the cleaning of the machine is prohibited to deal with hard objects, to prevent damage to the surface of the machine;
3, a long time without use should be unplugged from the power cord, and will be placed in the instrument in a cool, dry place, put the dust bag;
3, long time without use should be unplugged, and will be placed in a cool, dry place. Set on the dust bag;
4, the machine should be re-activated after a long period of unused before checking whether the function is normal, and then test.