The 3S colorimeter is a compact analytical instrument for online analysis and process monitoring. The colorimeter is based on a color developing chemical reaction that is carried out in the glass measuring cell of the analyzer. The sample, coming from an external reservoir or process stream, is autonomously picked up by the instrument and mixed with the appropriate reagents to allow the reaction to occur. The analyzer uses an LED light source and a photodiode to photometrically measure the developed color intensity (absorption). The absorption is proportional to the concentration of the chemical component to be measured. The detection limit is in the low ppb range.
Ammonium reacts with salicylate and hypochlorite ions in the presence of ferricyanide ions to form the salicylic acid analog of indophenol blue. The resulting color is directly proportional to the ammonium concentration present and is determined at 660 nm.
measuring range: 1 – 1000 ppb to high 5 – 1000ppm
