HI781 Marine Nitrate Low Range Handheld Colorimeter • Ideal for aquariums and marine biology • Easier to use and more accurate than chemical test kits • Small size, big convenience Nitrate is a by-product of the Nitrogen Cycle. Excessive amounts of nitrates in a reef aquarium can promote the growth of undesirable organisms including algae and dinoagellates while insu¤cient amounts can lead to starvation in which SPS and other corals will show signs including the loss of color and paleness. The HI781 Nitrate Checker HC is a handheld colorimeter that uses the Beer-Lambert principle to determine the concentration of nitrate colorimetrically. The HI781 is designed speci¡cally to measure low levels of nitrate in a saltwater aquarium. The 0.00 to 5.00 ppm range is ideal for reef aquarium maintenance. Specifications HI781 (LR) Range 0.00 to 5.00 ppm (as NO²Õ) 0.0 to 50.0 ppm (calculated) using dilution Resolution 0.01 ppm Accuracy 0.25 ppm ±2% of reading @ 25 °C (77 °F) ±2.5 ppm ± 5% of calculated reading using dilution Light Source Light Emitting Diode @ 525 nm Light Detector Silicon photocell Method Zinc Reduction method. The reaction between nitrate and the reagent causes a pink/violet tint in the sample. This checker has been developed to work with seawater samples. Interferences Nitrite, copper 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 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 HI781 Checker HC is supplied with Marine Nitrate Low Range reagent starter kit (reagents for 25 tests), sample cuvette and cap (2 pcs.), filter paper (25 pcs.), filter holder (1 pc.), mixing vial and cap (1 pc.), 5 mL syringe with tip (1 pc.), 10 mL syringe (1 pc.), 1 mL graduated syringe (1 pc.), plastic refilling pipette (1 pc.), 16 gauge blunt needle (1 pc.), 1.5V AAA alkaline battery (1 pc.), and instruction manual. Reagent Set HI781-25 Reagents for 25 Marine Nitrate Low Range tests Calibration Set HI781-11 Marine Nitrate Low Range certified standard kit See page10.166 for Checker HC accessories www.hannainst.com | 10 10.157 Photometers Checker®HC
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