Petroleum oils comparator

The Lovibond Petroleum Oils Comparator (POC) conforms to the instrument requirements specified in ASTM D 1500 for visual determination of ASTM Color by direct comparison with colored glass standards. It is widely used for color grading of petroleum products such as lubricating oils, heating oils and diesel fuel. The POC is a 3-field instrument which incorporates the 16 glass standards that make up the scale in a pair of discs. With a 3-section field of view, the sample and two adjacent standards on the ASTM Color scale are viewed simultaneously, making it easier to achieve the optimum color match. For rapid grading within predetermined color limits, the glass standards can be set to the two limiting colors. The tungsten halogen light source is color corrected to CIE illuminant C, guaranteeing constant lighting conditions for color grading, irrespective of ambient lighting.