The Lovibond^® AF327 is a special kit for visual colour grading of Platinum-Cobalt/Hazen/APHA Colour over the range 0 - 70 mg Pt/l.
It allows users to comply with the path length requirements of ASTM D 1209, which specifies a system for colour comparison where a 100 ml column of sample 275 - 295 mm in length is matched with platinum-cobalt solutions.
The AF327 kit is typically used for light yellow liquids such as water, oils and chemicals.
The colour is determined by visually matching a column of sample in a Nessler cylinder with precalibrated coloured glass standards, which are stablecoloured and not affected by UV light or extreme environmental conditions. Because the sample colours are relatively unsaturated, the kit employs a long path length Nessleriser comparator to give greater measurement sensitivity and accuracy.