Hello everyone, this is the North-South Chaohua Instrument—Magnetic Stirrer.
As the name suggests, a magnetic stirrer is a principle that uses a magnetic field to repel the same sex and attract the opposite sex. It uses a magnetic field to drive a magnetic stirring bar placed in a container to rotate and stir. Generally used in the laboratory, such as the mixing of liquids and liquids, or the mixing of low-viscosity liquids and solids. In the NBCHAO magnetic stirrer channel, many brands are included, such as the familiar IKA, and the domestic Yiheng. Dlab, Chijiu, Bante and other brands.
Generally, the magnetic stirrer is selected mainly from several aspects:
First, the number of jobs.
The magnetic stirrer is divided into one station, two stations, four stations, six, ten or more. You can choose different stations according to the needs of laboratory mixing.
Second, temperature control
The magnetic stirrer has heating and constant temperature in terms of temperature control.
Third, speed control
The number of magnetic stirrers is generally adjustable or divided into non-adjustable speed
Fourth, timing control
Magnetic stirrer can be divided into timed or non-timed
Fifth, the amount of stirring
The stirring capacity is generally small and can be less than 100ml, and the large one can reach 20L.
In general, the selection of a magnetic stirrer is mainly based on the following aspects, the maximum stirring capacity, the number of stations, the stirring speed, the temperature control range, the heating power, and the timing range to select different magnetic stirrers. When selecting the model, pay attention to the control accuracy of stirring speed, the accuracy of temperature control, and the accuracy of timing.
Specifically, in terms of stirring speed, the stirring speed of a general magnetic stirrer can reach about 2000 rpm, that is to say, it can reach 2000 revolutions per minute, which is relatively high. Generally, it can reach between 600 and 1500. Stirring capacity The mixing capacity of multi-station is relatively large. Generally, the mixing capacity of a single station is not so much. The small ones are several hundred milliliters, say 250 milliliters, and the large ones may reach several liters. The input power of the magnetic stirrer is generally between tens of watts and several hundred watts, and the timing can be adjusted according to different experimental environment requirements. The main timing can be as small as zero to 120 minutes. The big ones can reach zero to 10,000 minutes. There are one-way stirring and two-way stirring in the way of work. In addition, the material of the working plate surface of the general magnetic stirrer is more concerned by the manufacturer. The main materials are abs engineering plastics, PET, stainless steel, glass ceramics, aluminum alloy discs, etc. The temperature control range can reach RT+~200 degrees, and the higher temperature can reach more than 300 degrees, or even 450 degrees. The temperature control accuracy is mostly at 0.5°C, or around 1°C. In the laboratory, the environment may be harsh. When choosing a magnetic stirrer, special attention should be paid to its protection level, the ordinary one can reach ip20 or ip30. better. 30 to 50. Relatively high ones, such as German Wiggens and domestic Dalong Xingchuang, can reach above ip60. In addition, some accessories that may be needed around the magnetic stirrer, such as temperature probes, are also called temperature probes. During magnetic stirring, it is used to detect the temperature of the liquid. As for the magnetic stirrer, it is a manual button, or it is displayed on the LCD screen. I think these are optional. It doesn't matter if it's good or not. There are more than 300 types of magnetic stirrers currently included in NBCHAO Mall, including their detailed specifications, product catalogs, product operation instructions and operation videos, all of which are included in the "Zha Instrument" under NBCHAO. If users need to purchase, they can select the model through the "Instrument Check" system, and the prices are all real prices. Welcome to buy.
