Magnetic stirrers are laboratory instruments used for liquid mixing, primarily for agitation or simultaneous heating to agitate low viscosity liquid or solid-liquid mixtures. The basic principle is to use the principle of homogeneity and mutual attraction of the magnetic field, and use the magnetic field to push the magnetic stirrer placed in the container to perform circumferential operation, thereby achieving the purpose of stirring the liquid. With the heating temperature control system, the sample temperature can be heated and controlled according to the specific experimental requirements, and the temperature conditions required for the experimental conditions can be maintained to ensure that the liquid mixing meets the experimental requirements.
working principle
Using the characteristics of the same nature of the magnetic material, the magnetic stirrer is driven to rotate by continuously changing the polarity of both ends of the base, and the rotation of the sample is driven by the rotation of the magnetic stirrer to uniformly mix the sample;
The sample is heated by the bottom temperature control plate, and the rotation of the magnetic stirrer is used to uniformly heat the sample to a specified temperature;
Through heating power adjustment, the heating rate is controllable for a wider sample processing.
A typical magnetic stirrer has two functions of stirring and heating.
Specifically:
The first effect is to make the reactants mix evenly and make the temperature uniform;
The second role, speed up the reaction, or evaporation rate, shorten the time
Precautions
1. When stirring, when the stirrer is beating or not stirring, please turn off the power and check if the bottom of the beaker is flat and the position is positive. Please measure it at the same time. The current voltage is between 220V±10V, otherwise the above will occur. Happening.
2, the heating time is generally not too long, intermittent use to extend the life, not heating without stirring.
3. It can work continuously for 8 hours at medium speed, and can work continuously for 4 hours at high speed. It can prevent severe vibration during work.
4. Power consumption: The power socket should be a three-hole safety socket, which must be properly grounded.
1. Move the mouth again: When the electric mixer is faulty, do not respond to the first action. You should first ask before and after the fault occurs and the fault phenomenon. For unfamiliar equipment, you should also be familiar with the circuit principle and structural characteristics, and abide by the corresponding rules. Before disassembling, be familiar with the function, position, connection method and relationship with other devices around the electrical components. If there is no assembly drawing, draw a sketch and mark it.
2, first external and internal: first check the equipment for obvious cracks, defects, understand its maintenance history, age, etc., and then check the machine. Before the disassembly, the surrounding fault factors should be excluded, and it can be disassembled after it is determined to be an internal fault. Otherwise, blind disassembly may worsen the equipment.
3, mechanical after the electrical: only after determining that the mechanical parts are not faulty, then carry out electrical inspections. When checking the circuit fault, you should use the testing instrument to find the fault location, and confirm the faultless fault after the contact, and then check the operational relationship between the line and the machine in order to avoid misjudgment.
4. Dynamic after static: When the equipment is not powered, judge the quality of the electrical equipment buttons, transformers, thermal relays and fuses to determine the fault. Power-on test, listen to its sound, measure parameters, judge faults, and finally perform maintenance. For example, when the motor is out of phase, if the three-phase voltage value cannot be determined, it should be heard and the relative ground voltage measured separately to determine which phase is missing.
5, first clean and repair: For heavy-duty electrical equipment, first clean its buttons, wiring points, contact points, check whether the external control keys are malfunctioning. Many faults are caused by dirty and conductive dust.
6, after the power supply equipment: the failure rate of the power supply part of the entire faulty equipment accounted for a high proportion, so the first to repair the power supply can often get twice the result with half the effort.
7. First fault after commissioning: For electrical equipment with both commissioning and faults, the fault should be eliminated first, and then commissioning. The commissioning must be carried out under the premise of electrical line speed.
8, the first general after the special: due to the quality of assembly parts or other equipment failure caused by the failure, generally accounted for about 50% of common faults. The special faults of electrical equipment are mostly soft faults, which are measured and repaired by experience and instrumentation.
When the electric stirrer is damaged in the experiment, we must not be anxious. We should calmly deal with it. We will deal with it according to the 8 points we explained above. We will first judge the cause of the malfunction, and then we will be able to do more with less. In addition, we must also use it in daily use. Pay attention to the maintenance of the electric mixer to extend the life of the equipment as much as possible.
5. The instrument should be kept clean and dry. It is forbidden to flow into the machine to avoid damage to the machine. When not working, the power should be cut off.
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