The following are scientific maintenance methods for vacuum centrifugal concentrators, covering daily maintenance, periodic maintenance, and key precautions, aimed at ensuring stable equipment performance and extending service life:
1、 Basic maintenance after daily use
1. Instant cleaning treatment
-Chamber and rotor: Immediately after each use, use a soft dust-free cloth dipped in purified water or 75% ethanol to wipe the inner wall of the centrifuge chamber and the surface of the rotor, removing any residual liquid or salt crystals. If handling corrosive samples (such as acid/alkali), the wiping time should be extended and dried.
-Sealing ring and O-ring: Check whether the rubber seal is contaminated, and if necessary, clean the gaps with a cotton swab to avoid aging and cracking that may cause vacuum leakage.
-Waste liquid collection bottle: Empty the waste liquid and clean the bottle body to prevent microbial growth or chemical corrosion.
2. Ventilation and dehumidification
-Keep the instrument in a well ventilated environment to avoid the retention of humid air. If the environmental humidity is greater than 60%, the built-in dehumidification function or an external desiccant box can be enabled.
-Pay attention to the issue of condensation water when using in winter. Before shutting down, briefly open the exhaust valve to balance the internal and external air pressure.
2、 Periodic deep maintenance (divided by frequency)
Weekly Tasks
Vacuum pump maintenance: Check if the pump oil level meets the standard (using specialized vacuum pump oil), observe the color of the oil, and replace it immediately if it appears milky white or cloudy. At the same time, clean the dust on the air inlet filter to prevent blockage from affecting the pumping speed.
Motor heat dissipation detection: After running for 30 minutes, touch the temperature of the motor casing. If it overheats (>60 ℃), clean the dust accumulation on the fan blades and heat dissipation holes.
Monthly tasks
Condenser defrosting: If equipped with a cold trap device, the defrosting program needs to be manually started. After the frost melts, dry the inner wall of the water to avoid repeated freeze-thaw damage to the coating.
Pipeline leak detection: After closing all interfaces, start the vacuum testing mode and confirm that the vacuum degree remains within the set value ± 5% range within 3 minutes. Otherwise, check for loose pipelines or seal failure.
Quarterly tasks
Rotor dynamic balance verification: Disassemble the rotor components, use professional tools to detect the degree of wear on the shaft sleeve, replace the bearings if necessary, and recalibrate the dynamic balance.
Electrical safety inspection: Use a multimeter to measure the insulation resistance of the power cord (should be>2M Ω), and check the sensitivity of the emergency stop button response.
3、 Long term idle storage specification
1. Preprocessing process
-After completing the complete cleaning procedure, remove the rotor and store it separately to avoid spring fatigue deformation.
-Inject a small amount of new oil into the vacuum pump to cover the rotor surface for rust prevention, cut off the power and unplug the plug.
2. Environmental control
-Store in a dark environment with a temperature of 15-25 ℃ and humidity<40%, and do not tilt it.
-Power on the machine once a month and run it for 10 minutes without load to activate electronic components.
4、 Special precautions
Prohibited behavior: Do not directly flush the interior of the equipment to avoid water infiltration into the circuit board; It is strictly prohibited to forcefully open the cover without depressurization to prevent explosion and explosion hazards.
Chemical protection: When dealing with volatile organic solvents, it is necessary to connect the exhaust gas absorption device and continue vacuuming for 5 minutes after the experiment to replace the gas.
Record management: Establish an "Equipment Maintenance Log" to record the time of each maintenance, replacement of parts, and abnormal situations, in order to trace the cause of faults.
Through the standardized maintenance process mentioned above, the equipment failure rate can be significantly reduced, ensuring the stability of core parameters such as vacuum degree and centrifugal force. It is recommended to develop an annual professional maintenance plan based on the instrument manual and have engineers conduct in-depth debugging.