HI727 Color of Water Handheld Colorimeter • Easier to use and more accurate than chemical test kits • Dedicated to a single parameter • Small size, big convenience • Ideal for water quality True color is caused by dissolved compounds in water and can be both natural or arti¡cial. Apparent color is caused by both dissolved and suspended solids. Color is measured in Platinum-Cobalt units (PCU). The AWWA recommends ≤ 15 PCU. The term ‘‘true color’’ is de¡ned as the color of water from which turbidity has been removed. The term ‘‘apparent color’’ includes not only color due to substances in solution, but also color that is due to suspended matter. Apparent color is determined on the original sample without ¡ltration or centrifugation. In some highly-colored industrial wastewaters, color is contributed principally by colloidal or suspended material. In such cases, both true color and apparent color should be determined. To determine true color, turbidity must be removed before analysis. Methods for removing turbidity without removing color vary. Filtration yields results that are reproducible from day to day among laboratories, however, some ¡ltration procedures may also remove some true color. Centrifugation avoids interaction of color with ¡lter materials, but results vary with the sample nature, size, and speed of the centrifuge. When sample dilution is necessary, whether it precedes or follows turbidity removal, it can alter the measured color. Acceptable pretreatment procedures are included with each method. The pretreatment method should be stated when reporting the results. The HI727 Checker®HC is very simple to use. First, zero the instrument with deionized water. Next, prepare the sample according to the Apparent/True color measurement. Place the second vial with prepared sample into the Checker HC, press the operational button and the HI727 Checker® displays the color of water in PCU. Specifications HI727 Range 0 to 500 g/L PCU Resolution 5 PCU Accuracy ±10 PCU ±5% of reading @ 25 °C (77 °F) Light Source Light Emitting Diode @ 470 nm Light Detector Silicon photocell Method Adaptation of the Standard Methods for the Examination of Water and Wastewater 21st Edition, Colorimetric Platinum Cobalt Method Environment 0 to 50 °C (32 to 122 °F); max. 95% RH non-condensing Battery Type 1.5V AAA Alkaline Auto-off After 10 minutes of non-use and 2 minutes after reading Dimensions 86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”) Weight 64 g (2.3 oz) Ordering Information HI727 Checker®HC is supplied with sample cuvette and cap (2 pcs.), 1.5V AAA Alkaline battery (1 pc.), and instruction manual. Calibration Set HI727-11 Color of Water certified standard kit Accessories HI40227 Filter assembly HI40228 Filter disc (25 pcs.) See page10.166 for Checker HC accessories | www.hannainst.com 10 10.146 Photometers Checker®HC
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