The relationship to CIE led finally to ASTM D1544, Standard Test Method for Color of Transparent Liquids (Gardner Color Scale). ASTM D 1544 describes glass filters to compare with yellow colored liquids and ASTM D6045 defines the correlation to the Gardner color scale. It was originally designed for testing resins, fatty acids, varnishes and drying oils using liquid color standards. This color scale describing the yellowness of transparent liquids is from 1 to 18, where 1 is light yellow and 18 is a dark brown. The test for APHA color is performed in chemical, pharmaceutical, petroleum und plastic industries, as well as in beverage production. The APHA color scale range is from 0 to 500 in ppm (parts per million) platinum cobalt to distilled water, what is the zero point (also called white water). Generally it is described in ASTM D 1209 for the comparison of yellow sample color intensity. To evaluate pollution levels in wastewater and for drinking water control, a specific color scale is used, called Pt/Co scale, APHA-Hazen Scale, or APHA Scale. APHA Scale (American Public Health Association) ASTM D 1500 also describes the color testing of petroleum products. The Saybolt color scale range is from +30 (clear water / white) to -16 (dark yellow). To determine if fuel, e.g., kerosene, gasoline, diesel, is contaminated or has degraded during storage time, a specific color measurement test, using the Saybolt color scale (ASTM D156, ASTM D6045), can be performed. Electrodes, Poles and their effects on ConductivityĬolor scales and definitions Saybolt color scale.PROFIBUS® PA / FOUNDATION™ Fieldbus Device Files.Chlorine Dioxide Vent Scrubber Monitoring.Natural Gas Liquids (NGL) Color Monitoring.Condensate and Cooling Water Monitoring.Crude Distillation Unit (CDU) Monitoring.Color and Turbidity Control in Sugar Refining.Leak Detection / Condensate / Carryover Monitoring.Monitoring High Protein Concentrations Downstream.
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