SPECIFICATIONS HI770 (HR) HI705 (LR) Range 0 to 200 ppm (as SiOº) 0.00 to 2.00 ppm (as SiOº) Resolution 1 ppm 0.01 ppm Accuracy ±2 ppm ±5% of reading @ 25 °C (77 °F) ±0.03 ppm ±5% of reading @ 25 °C (77 °F) Light Source Light Emitting Diode @ 470 nm Light Emitting Diode @ 610 nm Light Detector Silicon photocell Method Adaptation of the US EPA Method 370.1 and Standard Method 4500-SiOº C Adaptation of the ASTM D859 Method of Heteropoly Blue Method. The reaction between silica and reagents causes a blue 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 three minutes of non-use and two 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 HI770 Checker®HC is supplied with sample cuvette and cap (2 pcs.), Silica High Range reagent starter kit (reagents for 6 tests), 1.5V AAA Alkaline battery (1 pc.), and instruction manual. HI705 Checker®HC is supplied with sample cuvette and cap (2 pcs.), Silica Low Range reagent starter kit (reagents for 12 tests, 1.5V AAA Alkaline battery (1 pc.), and instruction manual. Reagent Set HI770-25 Reagents for 25 Silica High Range tests HI705-25 Reagents for 25 Silica Low Range tests Calibration Set HI770-11 Silica High Range certified standard kit HI705-11 Silica Low Range certified standard kit HI770 Ð HI705 Silica High Range and Low Range Handheld Colorimeter • Easier to use and more accurate than chemical test kits • Dedicated to a single parameter • Small size, big convenience • Ideal for: · Aquaculture · Water quality · Environmental · Water treatment Silica is the name given to silicon dioxide, SiO2. Silicon (Si), is the most abundant element in the Earth’s crust. Silicon is never found in its elemental form in nature. In its crystallized form it is only reactive under conditions of extremely high temperatures. Water and water vapor have little inuence upon silicon solubility, because a protective surface layer of silicon dioxide is rapidly formed. Silicon binds with other elements to form various species of silica and silicate. The concentration of the soluble silica molecules are important to aquaculture because they inuence (and limit) the growth of diatoms. In most waters, the predominant form of dissolved silica is monosilicic acid, which incorporates two water molecules. The HI705 and HI770 Checker®HC Handheld Colorimeters are a simple, accurate, and cost eective way to measure silica. 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 Checkers HC ¡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 10.165 Photometers Checker®HC
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