Some customers may use different brands of particle counters or send oil samples to different laboratories for testing in order to determine the true extent of oil contamination, but the results may vary. Today, let's briefly talk about why such problems arise. We hope this small class can be helpful to friends from manufacturers who have had similar experiences.

Factors causing differences in test results

• What are the differences caused by the human operation of the inspector, such as whether the sample has been homogenized, defoamed, and injected with high viscosity assistance, and what is the treatment effect?
  
• Is it the same oil sample? Is homogenization treatment done before packaging?
  
• Whether the sampling point and sampling time are consistent: With the operation of the equipment, the oil changes every minute and every hour, and it is not from the same batch of oil samples, so it does not have a year-on-year significance;
  
• Is the cleanliness of the sampling bottle up to standard, is the transportation and storage of oil samples up to standard, and is the testing environment up to standard?
  
• Is the principle of the testing instrument the same?
  
• Whether the testing instruments used are within the calibration validity period, calibrated with the same batch of standard oil, calibrated through legitimate channels, and calibrated for both counting and volume simultaneously.
  

When there is a significant difference in the oil sample sent for inspection, manufacturers must handle it with caution. A safer and more secure approach is to

• Ask the testing party to provide the raw data of the test and provide proof of the validity period of the equipment calibration;
  
• Ask different testing parties to return the remaining liquid samples for exchange, conduct secondary testing, and then compare the results;
  
• Send the remaining liquid sample to a third testing party for testing, and then compare the results.