Color measurement remains a vital quality-control indicator for refineries, lubricant manufacturers and power plants, as it reflects oil purity, oxidation and contamination status. In 2026, qualified petroleum color testers must comply with ASTM D1500, ISO 2049 and GB/T 6540, supporting a measuring range of 0.5–8.0 ASTM color numbers, while extended models cover 1–25 color numbers per SH/T 0168.
A core mandatory parameter is the halogen light source with a colour temperature of 2750K ±50K, delivering stable, flicker-free illumination and eliminating ambient light interference. Standard colour comparison tubes adopt an inner diameter of Φ32.5 mm with a 120–130 mm height. For repeatability, visual testers achieve ≤0.5 colour number deviation, whereas automatic photoelectric models reach ≤0.1 colour number repeatability, significantly reducing human reading error.
Modern 2026 upgraded versions support digital data storage, USB or Ethernet output and LIMS connection, meeting traceability requirements for international commodity inspection. Suitable for transformer oil, diesel, base oil and gear oil, these instruments operate reliably at 5–45℃ and 10–80% RH, becoming standard laboratory equipment for cross-border petroleum trade compliance verification.
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