The efficiency of centrifugal separation is related to the rotation speed of the centrifuge and the quality of the sediment to be settled. The effect of centrifugal separation is much better than gravity sedimentation and filtration, and it is suitable for the separation of solid particles or droplets in various solutions with high viscosity, emulsions or oil solutions that are generally difficult to filter.
The low-speed centrifuge is generally 4000-5000r/min, but it is not more than 10000r/min in the regulations, and the high-speed centrifuge can reach more than 10000r/min. Laboratory centrifuges generally hold 7-12 10ml centrifuge tubes. There are also models with smaller capacity (1.5ml-7ml) or larger capacity (25ml-400ml) or more centrifuge tubes. At present, most of the centrifuges use brushless variable speed, and some can be controlled by timing, digital display or microcomputer.
Specifications for the use of laboratory centrifuges:
1. The type, size and quality of the centrifuge tubes used should be the same as possible, and the amount of liquid added should account for half the volume of the centrifuge tube.
2. The centrifuge tubes should be placed symmetrically. If the centrifugation sample is odd, add another tube with the same amount of water to adjust the symmetry.
3. When starting the centrifuge, it should be accelerated gradually. When abnormality is found, it should be stopped for inspection and troubleshooting.
4. When closing the centrifuge, gradually decelerate until it stops automatically. Do not force deceleration or stop by hand.
5. The casing of the centrifuge should be kept clean, and the bottom of the casing should be cushioned with rubber, glass fiber or foam to prevent the test tube from breaking.
6. The laboratory centrifuge must be covered with a protective cover to ensure safety.
The laboratory centrifuge and medical centrifuge must be operated in accordance with the specifications in order to ensure the safe and smooth progress of the experiment and the accuracy of the results of the centrifugation experiment.