1. Automatic Potentiometric Titrator
Titting Cup and Tubing Cleaning: Immediately after the experiment, rinse the titration cup and tubing with deionized water to prevent sample residue (especially high-salt or organic solvents). Perform a deep cleaning weekly: Soak the tubing in 5% dilute nitric acid (inorganic samples) or ethanol (organic samples) for 15 minutes, then rinse with pure water.
Electrode Maintenance: The pH/reference electrode must be immersed in 3M KCl preservation solution after use to prevent drying; regularly check the membrane for damage or contamination, polishing or replacing it if the response is slow. Avoid contact between the composite electrode and strong acids, alkalis, or protein samples; activate it monthly with 0.1M HCl or NaOH.
Mechanical Component Inspection: Check the titration needle for bending or blockage, ensuring uniform dispensing; keep the magnetic stir bar clean to prevent friction against the bottom of the cup, which could damage the motor.
Calibration and Verification: Calibrate the pH electrode at least weekly using standard buffer solutions (pH 4.01/7.01/9.21), ensuring the slope is between 95% and 105%. Perform volume calibration monthly (e.g., verify burette accuracy using the gravimetric method).
2. Tubing-Free Drip System
Pre-Holiday Maintenance Highlights: Empty the mother liquor from the mother liquor bottle, clean the bottle, and clean the drip valve body using a dedicated cleaning kit.
Clean the water tank and filter cartridges; replace if heavily soiled.
After filling the auxiliary agent tank with clean water, drain 4–5 times to clean the drip pipeline and valve body.
Pneumatic System Maintenance: Check the compressed air filter, removing any accumulated water and oil; adjust the one-way regulating valve to ensure the cylinder extension and retraction speed is moderate, avoiding excessive speed or slowness.
Balance and Turntable Cleaning: Remove the balance holder to calibrate the balance. Clean the titration turntable, mother liquor bottle turntable, and cup holder. Wipe only with a wrung-out towel; do not rinse with water.
3. General-Purpose Automatic Dispenser (e.g., Disinfectant Dispenser)
Daily Cleaning: After each use, wipe the outer casing with a soft cloth dampened with neutral detergent. Avoid contact of corrosive solvents with the equipment surface.
Dispensing Head Maintenance: Check the dispensing head daily for blockages. If necessary, wipe with a special cleaning solution or replace the needle tip.
Power Cord Inspection: Regularly check the power cord for aging or damage. Ensure a secure connection to prevent the risk of electrical leakage.
4. Automatic Liquid-Liquid Extraction Instrument (Related Equipment Reference)
Seal and Piping Inspection: Regularly check the seals and pipe connections for leaks. Clean water droplets or dirt from the instrument surface quarterly. Key Component Maintenance: Check pump tubing for adhesion or wear, especially when flow rate decreases; replace promptly. Loosen CNC pump tubing when not in use for extended periods to prevent aging and deformation.
General Maintenance Recommendations:
Environmental Control: Avoid high-temperature (>30℃) or high-humidity environments; keep away from strong electromagnetic interference sources (such as centrifuges and microwave ovens).
Power Failure Protection: When not in use for extended periods, disconnect the main power supply, remove and store the electrodes, and empty the waste liquid bottle to prevent corrosion.
Maintenance Records: Establish a maintenance log to record calibration dates, reagent changes, and abnormal phenomena (such as noise or data fluctuations) for easy problem tracing.
