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1 Correct installation (1) Power supply voltage: Voltage fluctuations should meet the national standard of +10%, otherwise some manufacturers' centrifuges cannot operate normally. If the voltage fluctuates above this, it is recommended to use a voltage regulator to comply with this grid.
(2) The ground wire should be firmly: the wiring of the power supply of the room should meet the requirements. China is a three-phase four-wire system. The three-phase is the three-phase in industrial power. When three-phase electricity is used, the neutral line is separated from the ground line. More importantly, whether it is three-phase industrial power or not, the general single-phase power is good, and the ground line should be reliable to avoid leakage. The ground wire cannot be connected to the heating pipe or the water pipe.
(3) The ground should be flat and firm: for large centrifuges, the floor should be firm at the installation site to ensure the normal operation of the rotor of the centrifuge, without recessing, and the ground at the installation and fixing should be flat and firm.
(4) Find a good level: find a more accurate small level, open the lid of the centrifuge, find the level on the main shaft, and adjust the level of the adjusting bolts next to the four casters to find the level. Note that one of the feet cannot be lost.
2 loading to find balance
In the design and manufacture of the centrifuge, the imbalance caused by the machining error of the rotor has been remedy for the dynamic balance test, but all centrifuges have their allowable unbalanced load. Centrifuge manufacturers strive to give larger values ​​in order to compete with other manufacturers on the maximum unbalance limit allowed by the centrifuge. At this larger value, the centrifuge can be operated, but the imbalance force generated at this time suddenly hits the bearing and the bracket at n times per minute, and the centrifuge is damaged. Therefore, users should try to find a good balance and centrifuge for those expensive centrifuges, which is good for the life of the centrifuge.
3 Clean the water in the centrifugal chamber. The centrifuge uses cooling when it is running. It is frosted in the centrifugal chamber due to the moisture of the air. After the shutdown, it is frosted into water. Most foreign low-speed large-capacity centrifuges have no drainage holes, and the water in the centrifugal chamber is more and more accumulated. At this point, the user should remove the rotor and clean up the accumulated water. When reinstalling the rotor, be sure to install it to avoid accidents.
4 Aluminum alloy can not be corroded The rotor of the centrifuge is generally made of aluminum alloy. When it is corroded, the strength is reduced and it is easy to accident. The aluminum alloy is susceptible to liquid corrosion. After cleaning, it is blown dry with a hair dryer, or inverted for a period of time to confirm that it can be used. Some blood stations imported centrifuges, and there should be 6 plastic trays in 6 aluminum cups. The plastic tray should be placed in a blood bag to avoid direct placement in the aluminum cup. Note the test tube for cracks. If the test tube (especially the test tube used repeatedly) has cracks, it must not be used. Otherwise, the test tube rupture will cause the rotor to lose its balance during rotation, which may cause a vicious accident such as broken shaft.
5 Broken shaft accident
The rotor is not placed well, or the sample imbalance is too large, and the centrifuge starts. Modern imported centrifuges have unbalanced protection, that is, when the unbalance amount exceeds a certain limit, the power should be automatically cut off to stop the centrifuge. However, under the above circumstances, it is already late, and a serious accident will occur. One of the malignant accidents is the broken shaft. Due to the sudden breaking of the shaft during high-speed rotation, the centrifugal rotor has no support, and the centrifugal machine is turned into a chaotic collision, which can make the centrifuge rotate the machine to a 270° angle. At this time, if there are people or equipment next to it, it will cause casualties and damage to the equipment.
How to use the centrifuge safely in the laboratory
How to use the centrifuge safely in the laboratory