GB/T 6538-2022 in English
VALIDDetermination of apparent viscosity of engine oils—Using the cold-cranking simulator
- Issued on:2022-10-12
- Implemented on:2022-10-12
- File Format:PDF
- Delivery:Via email within 1~3 business days
$272.00
《GB/T 6538-2022发动机油表观黏度的测定 冷启动模拟机法》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC1（全国石油产品和润滑剂标准化技术委员会石油燃料和润滑剂分会）执行，主管部门为国家标准化管理委员会。
Introduction
Analysis of core changes in the standard revision
The 2022 new standard makes 8 structural adjustments compared to the 2010 version, among which the key changes include:
- The lower limit of the measurement temperature is extended from -5℃ to -10℃
- The number of calibration oils increased by 107% (13→27) to enhance the traceability of measurement values
- New ultrasonic bath technical specifications (applicable to the treatment of oil samples with bubbles)
| Comparison dimensions | GB/T6538-2010 | GB/T6538-2022 |
|---|---|---|
| Calibration oil selection | 1+3 for Group A/B | 1+3+1 for Group A/B/C |
| Test accuracy comparison | Single precision procedure | Refrigeration method classification principle |
Key instrument operation specifications
Cold start simulator (CCS)Configuration requirements
- Speed sensor: ±0.05‰ dynamic accuracy
- Constant temperature system: Ultra-fast response of -30℃ in 29 seconds (thermoelectric model)
- Standard Luer interface micro adapter (supports 10mL sample test)
Calibration process optimization plan
| Phase | Cycle | Key parameters |
|---|---|---|
| Current calibration | Quarterly verification | 0.240kr/min±0.001 |
| Temperature correction | Semi-annual | TVP difference＜0.06℃ |
Implementation and application guidance
- The laboratory should establish a special calibration oil reserve system with a reserve quantity ≥35
- Strictly control the impact of refrigeration selection differences: coolant unit and thermoelectric module data execution classification quality control
- For samples with excessive viscosity (＞25000mPa·s), it is recommended to adopt the gradient temperature drop scheme in Appendix B
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