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Classification And Usage Notes Of Large Capacity Refrigerated Centrifuges

Views: 212     Author: 英泰仪器有限公司     Publish Time: 2024-07-06      Origin: 长沙英泰仪器有限公司公众号

Classification and Usage Notes of Large Capacity Refrigerated Centrifuges

Classification of Large Capacity Refrigerated Centrifuges:

1. High-Speed Refrigerated Centrifuge:

  - Speed: Can reach above 10,000 rpm.

  - Materials: Angle rotors made of titanium alloy and aluminum alloy; centrifuge tubes made of capped polyethylene hard plastic.

  - Uses: Mainly used for collecting microorganisms, cell fragments, cells, large cell organelles, sulfate precipitates, and immunoprecipitates.

2. Low-Speed Refrigerated Centrifuge:

  - Speed: Generally does not exceed 4,000 rpm, with a maximum capacity of 2-4 liters.

  - Materials: Swing-out and angle rotors mainly made of aluminum alloy; centrifuge tubes available in hard glass, polyethylene hard plastic, and stainless steel.

  - Equipment: Equipped with a drive motor, timer, regulator (speed indicator), and a refrigeration system (adjustable temperature range from -20 to +40°C). Different capacities and models of rotors can be replaced as needed.

Maintenance Notes for Large Capacity Refrigerated Centrifuges:

1. Starting Issues:

  - If the motor often fails to start or the power indicator light is off, check if the indicator light fuse and the indoor distribution panel fuse are blown. Also, check if the power cord is properly connected.

2. Rotor Coil Issues:

  - If there is a short circuit or open circuit in the rotor coil, use a multimeter to check and rewind the coil. During use, factors like metal fatigue, overspeed, overstress, chemical corrosion, improper selection, imbalance during use, and temperature control failure can cause centrifuge tubes to break, samples to leak, and rotors to be damaged. Operators must be proficient in operating procedures, correctly select appropriate centrifuge tubes and rotors, strictly control each step, and minimize unnecessary damage. Use within the safety factor and warranty period of the rotor.

3. Operational Anomalies:

  - If any abnormal phenomena occur during operation, stop the machine immediately and do not force it to run to avoid unnecessary losses or accidents.

4. Bearing Issues:

  - If the centrifuge’s bearings are damaged or rotation is obstructed, lack of oil or dirt in the bearings can increase friction resistance, preventing the motor from reaching its rated speed. Clean or replace the bearings as needed. If the surface of the commutator has an oxide layer or is uneven, or if the brush does not match the edge of the commutator, the speed can decrease. Clean the commutator and brush to ensure good contact.

5. Oil Pressure Issues:

  - If the main unit cannot start due to high oil pressure, check all oil circuits for blockages, especially the small throttle holes. Clean them to ensure smooth operation.

6. Cooling Efficiency Issues:

  - One reason for poor starting and cooling efficiency of the centrifuge is a lack of power. Check the power supply and fuses separately. Low voltage and safety device faults can also prevent the refrigeration unit from starting.

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