What are the key points for routine maintenance of biochemical analyzers?

Routine maintenance of biochemical analyzers centers on cleaning, calibration, quality control, fluid system care, environmental stability, and record-keeping to ensure accurate, reliable results and prolong instrument life. Below are the key points organized by cycle and system:

 1. Daily Maintenance

- Surface & Exterior Cleaning

  Wipe the exterior, sample/reagent trays, and touch panel with 75% ethanol or mild detergent; remove spills, dust, and sample residues immediately.

- Probe & Needle Care

  Clean the outer walls of sample/reagent probes and stirring rods with alcohol swabs; run automatic flushing to prevent clogging and cross-contamination.

- Fluid System Check

  Empty and clean the waste container; confirm smooth drainage; verify sufficient purified water and cleaning solutions.

- Startup Checks

  Confirm stable voltage, UPS function, temperature (37±0.1℃ for reaction bath), and humidity; run daily quality control (QC) and blank tests.

- Shutdown Procedure

  Execute full internal cleaning cycles; cover reagents and store properly; log operation status, water consumption, and waste volume.

 2. Weekly Maintenance

- Deep Cleaning of Reaction Cuvettes

  Perform cuvette cleaning/soaking with alkaline or enzymatic detergent; ultrasonic cleaning to remove protein/fat deposits.

- Cuvette Blank & Integrity

  Measure cuvette blank absorbance; replace scratched, cloudy, or damaged cuvettes.

- Tubing & Pump Maintenance

  Inspect peristaltic pump tubes, seals, and connections for cracks/leaks; clean filters and nozzles.

- Mechanical Parts

  Lubricate bearings and tracks lightly (medical-grade lubricant); remove dust from moving parts.

 3. Monthly/Quarterly Maintenance

- Optical System Calibration

  Calibrate wavelength, light source intensity, and absorbance; replace aging lamps; verify photometric accuracy.

- Temperature System Verification

  Check incubator/reaction bath temperature with a calibrated thermometer; adjust if deviation >±0.3℃.

- Precision & Carry-Over Tests

  Verify sample/reagent volume accuracy (error ≤±1% for small volumes); test cross-contamination levels.

- Filter & Sensor Checks

  Clean/replace air filters, waste tank filters; check sensors for dirt or damage.

 4. Key System-Specific Points

- Fluid & Wash System

  Use only manufacturer-recommended cleaners; avoid generic agents that cause corrosion.

  Regularly flush lines to prevent salt/protein buildup; replace worn tubing promptly.

- Sample/Reagent Handling

  Keep reagents refrigerated after use; check expiration dates; avoid condensation dilution.

- Environmental Control

  Maintain stable temperature (18–28℃), humidity (40–60%); avoid direct sunlight, dust, and strong electromagnetic fields.

- Software & Firmware

  Keep OS, application, and firmware updated; back up data regularly.

- Safety & Documentation

  Wear PPE; handle biohazardous waste properly.

  Record all maintenance, calibration, QC results, repairs, and part replacements for audit and traceability.

 5. Long-Term (Annual) Maintenance

- Full preventive service by qualified engineers.

- Replace worn components (lamps, pumps, seals, probes).

- Professional calibration and performance verification by metrology services.

Core Principle: Follow the manufacturer’s manual and strict schedules. Consistent preventive maintenance drastically reduces downtime, errors, and repair costs.