English 
more 
English 
Views: 0 Author: Site Editor Publish Time: 2025-04-23 Origin: Site
Maintenance Overview
Routine care of the Lubricating Oil Evaporation Loss Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd ensures consistent measurements and extends equipment lifespan. Key maintenance tasks focus on the heating chamber, airflow system, and balance calibration.
Heating Chamber Care
Inspect the heating elements every 200 hours of operation. Clean chamber walls with a soft brush to remove residue. Replace worn gasket material that may allow air leakage and compromise temperature uniformity.
Airflow System Checks
Verify mass flow meter zero-offset monthly. Drain moisture traps and change inline filters to prevent water and particulates from affecting flow stability. Re-verify flow rates at multiple setpoints against a secondary flow standard.
Balance Calibration and Verification
Use certified weights to perform a two-point calibration (0 g and nominal sample mass) before each round of testing. Document drift and perform preventive recalibration whenever drift exceeds ±0.05 mg over 24 hours.
Data Analysis Tips
Evaluate replicate results (minimum three) to calculate mean evaporation loss and standard deviation. A coefficient of variation below 1 % indicates high repeatability. Compare against specification limits—e.g., ≤15 % mass loss at 250 °C—to determine compliance.
Troubleshooting Common Issues
Unexpected High Loss: Check for chamber leaks or contaminated air supply.
Low Mass Loss: Confirm sample weight and crucible cleanliness; residue buildup on the heating element can reduce effective temperature.
Flow Instability: Replace aging tubing and recalibrate regulators.
