Specifications HI749 (LR) HI723 (HR) Range 0 to 300 ppb (as Cr(VI)) 0 to 999 ppb (as Cr(VI)) Resolution 1 ppb 1 ppb Accuracy ±3 ppb ±5% of reading @ 25 °C (77 °F) ±5 ppb ±4% of reading @ 25 °C (77 °F) Light Source Light Emitting Diode @ 525 nm Light Detector Silicon photocell Method Adaptation of the ASTM Manual of Water and Environmental Technology, D1687-92, Diphenylcarbohydrazide Method. The reaction between chromium(VI) and the reagent causes a purple tint in the sample. 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 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 HI749 Checker®HC is supplied with sample cuvette and cap (2 pcs.), Chromium VI Low Range reagent starter kit (reagents for 6 tests), 1.5V AAA alkaline battery (1 pc.), and instruction manual. HI723 Checker®HC is supplied with sample cuvette and cap (2 pcs.), Chromium VI High Range reagent starter kit (reagents for 6 tests), 1.5V AAA alkaline battery (1 pc.), and instruction manual. Reagent Set HI749-25 Reagents for 25 Chromium VI Low Range tests HI723-25 Reagents for 25 Chromium VI High Range tests Calibration Set HI749-11 Chromium VI Low Range certified standard kit HI723-11 Chromium VI High Range certified standard kit HI749 Ð HI723 Chromium VI Low Range and High Range Handheld Colorimeters • Easier to use and more accurate than chemical test kits • Dedicated to a single parameter • Small size, big convenience • Ideal for: · Water quality · Environmental · Plating · Education There are two natural forms of ionic chromium: the hexavalent Cr(VI) and the trivalent Cr(III). Cr(III) is much less toxic than Cr(VI) and seldom found in potable waters. Cr(VI), however, is toxic to humans and is found in water. Even though the toxic eects from Cr(VI) in drinking water are not well documented, it is a suspected carcinogen. There are many industries that use chromic acid and other forms of Cr(VI) that could be a possible source of Cr(VI) pollution in either water, air, or both. One industry that can introduce Cr(VI) to water sources is the chrome-plating industry. Chromic acid is used in the electroplating process and can be present in industrial waste waters. Cr(VI) can also enter water supplies from industrial cooling towers where chromic acid is added to the water to inhibit metal corrosion. The maximum permissible level of Cr(VI) allowed to be released into the waterways is 50 ppb. Its level in drinking water is normally much lower, and a level higher than 3 ppb is suggestive of industrial pollution. The HI723 and HI749 Checker®HC Handheld Colorimeters are a simple, accurate, and cost eective way to measure Cr(VI). Each model is designed for a speci¡c range (low or high) in order to provide high levels of accuracy. The contoured style of these Checker HC's ¡t easily in the palm of your hand or pocket and the large LCD is easy to read. The auto shuto feature assures the battery life will not be drained if you forget to turn it o. See page10.166 for Checker HC accessories www.hannainst.com | 10 10.145 Photometers Checker®HC
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