![]() ![]() ICUMSA (International Commission for Uniform Methods of Sugar Analysis) The Standard Reference Method describes the use of a spectrophotometer or photometer measuring the attenuation of light at 430 nm wavelength, (blue). The Standard Reference Method (SRM) and European Brewery Convention (EBC) methods have mainly replaced the "Degrees Lovibond" or "°L" scale, with SRM results being approximately equal to °L. EBC (European Brewery Convention)įor product and production control beer brewers have to measure color intensity and turbidity (haze) in EBC units, roughly darkness of a beer or wort, as well as quantifying turbidity (haze) of beer. The most important advantages are the test device independent color evaluation under defined and reproducible standard conditions. This color scale is described in EN ISO 11664-4 „Colorimetry - Part 4: CIE 1976 L*a*b* Color space“. The L*a*b* color space (CIELAB, CIEL*a*b*, Lab colors) describes all visible colors, using a three dimensional space, where brightness L* is vertically positioned on the color layer (a*, b*). The spectrophotometer method using a 10 mm path length for transmission measurement is described in ASTM D6166, Standard Test Method for Color of Naval Stores and Related Products.ĬIELAB color space (Commission Internationale d`Eclairage, CIE) 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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