The following is a detailed explanation of the maintenance methods for liquid-liquid extraction systems:

1、 Basic daily maintenance

1. Cleaning and decontamination: Clean the surface and contact parts of the equipment after each use. Use a dust-free cloth dipped in ethanol or distilled water to wipe the instrument casing, control panel, and sample stage to prevent residual solvents from corroding the material. For containers such as extraction bottles and separation funnels, if there are sediment residues, they can be soaked in solvents such as ethanol and acetone and rinsed. Scratching with hard objects is prohibited to prevent damage to the inner wall. At the same time, clean the waste collection bottle in a timely manner to prevent overflow and corrosion of the internal circuit.

2. Pipeline and interface inspection: After use, rinse the infusion pipeline and extraction channel with distilled water to avoid blockage caused by solvent residue crystallization. Regularly check whether the pipeline interface and sealing gasket are leaking. If aging or deformation (such as hardening or cracking of the sealing ring) is found, the same specification accessories should be replaced immediately. In addition, attention should be paid to the status of the CNC pump tube. If there is adhesion or obvious wear (especially when the flow rate decreases), it should be replaced in a timely manner to avoid affecting the extraction efficiency.

2、 Special maintenance of core components

1. Extraction column/membrane maintenance: Regularly check whether the filling material of the extraction column is loose or contaminated. If the adsorption efficiency decreases or becomes blocked, replace the column with a new one according to the instruction manual model. For membrane extraction components, it is necessary to backwash the membrane surface with the corresponding solvent after use to remove residual samples and extend the service life.

2. Pump body and valve maintenance: Check the pipelines of peristaltic pumps and metering pumps for aging and damage every month, and replace worn parts in a timely manner. Electromagnetic valves and one-way valves require regular ultrasonic cleaning and air drying for assembly to ensure flexible switching and good sealing. If the instrument has a heating function, it is necessary to clean the surface stains of the heating plate and check the accuracy of the temperature sensor; The refrigeration module needs to keep the heat dissipation port unobstructed and regularly remove dust to prevent overheating and failure.

3、 Regular calibration and performance testing

1. Parameter calibration: The key parameters of the instrument (such as extraction time, speed, temperature control accuracy) are calibrated every 3-6 months, and their accuracy can be verified through standard sample testing. Regularly conduct no-load operation tests to observe the smoothness of start stop, coordination of components, and abnormal noise. If there is any abnormal noise, check the wear of the motor or bearings.

2. Comprehensive performance evaluation: At least once a year, conduct in-depth maintenance, including electrical system (power lines, sockets, circuit boards), sensor sensitivity testing, and lubrication inspection of mechanical transmission components. Establish maintenance logs to record the date of each operation, execution steps, and abnormal phenomena, in order to trace the root cause of the problem.

4、 Long term suspension management

1. Pre shutdown treatment: Clean the pipelines and extraction components, dry them, seal and store them to prevent moisture from entering and causing rust. Unplug the power cord and loosen the clamping rod of the pump head tube to keep the CNC pump tube in a relaxed state to prevent long-term compression deformation.

2. Storage environment requirements: Place in a dry, ventilated, and dark environment, away from heat sources and strong magnetic field interference. It is recommended to cover with a dust cover and regularly power on for short periods of time to prevent components from getting damp and aging.