I. Basic Cleaning After Daily Use
A basic cleaning should be performed after each operation to prevent residue buildup that could cause blockages or contamination.
1. Flushing the titration cup and tubing: Rinse the titration cup, needle, and liquid passages with deionized water or a dedicated cleaning solution, especially after handling high-salt, high-viscosity, or easily crystallizing liquids.
2. Wiping the syringe and seals: For models without tubing (such as those from Wuxi Kelinan Technology Equipment), wipe the outer wall of the 316L stainless steel syringe with a soft cloth and check for loose or contaminated seals.
3. Cleaning the electronic scale platform: If the equipment integrates a weighing system, clean the weighing pan and support regularly to prevent electrolyte or dye crystallization from affecting weighing accuracy.
II. Inspection of Key Components
Regularly inspect moving and contact parts to promptly identify signs of wear or aging.
1. Titration needle and tip: Check for bending, blockage, or crystal buildup. Unblock or replace if necessary with a fine needle.
2. Stirrer and Magnetic Stirrer: Ensure the stirrer is intact to prevent motor overload or glass breakage due to friction against the bottom of the cup.
3. Seals and O-rings: Check the elasticity and integrity of the filling cup seal, silicone tubing, and piston seal weekly. Replace any hardened, deformed, or leaking seals immediately.
4. Power Cord and Terminals: Check for aging, damage, or oxidation to ensure electrical safety.
III. Periodic Calibration of System Performance
Calibration is a core component for maintaining metrological accuracy and must be performed periodically.
1. Electronic Balance Calibration: Perform internal calibration using standard weights (e.g., 1g, 10g). Weekly calibration is recommended to ensure weighing accuracy of ±0.001g or higher.
2. Titration System Volume Calibration: Verify the burette output volume using the pure water weighing method. For example, 10mL should be controlled within ±10μL, conforming to JJG 814-2015 standard.
3. pH/Electrode Calibration (Applicable to titration equipment): Calibrate the electrode weekly using standard buffer solutions (pH 4.01/7.01/9.21), maintaining the slope between 95% and 105%.
IV. Preventative Replacement of Consumables and Wear Components Proactively replace components with limited lifespans to avoid unexpected malfunctions affecting production.
1. Electrode Replacement: Replace the pH or composite electrode when the response time exceeds 30 seconds. Its general lifespan is 1-2 years.
2. Silicone Tubing and Sealing Rings: Replace every 6 months or after 50,000 operations to prevent leakage or uneven flow due to aging.
3. Stirrer and Piston Assembly: Wear may occur after prolonged use; annual replacement is recommended to ensure stable operation.
V. Environmental Control and Operating Procedures Good operating environment and habits can significantly extend equipment lifespan.
1. Environmental Requirements: Avoid high temperature (>30℃), high humidity, or strong electromagnetic interference environments. Prevent electronic components from getting damp or experiencing signal interference.
2. Shutdown Procedure: Empty the waste liquid bottle after each use to prevent corrosion; disconnect the power and remove the electrodes for storage when not in use for extended periods.
3. Maintenance Log: Establish a log to record calibration dates, consumable replacements, and any abnormal phenomena, facilitating problem tracing and quality auditing.
✅ Note: For pharmaceutical or GMP environments, data integrity and audit trail functions are also required to ensure all maintenance operations are traceable.
