See page10.166 for Checker HC accessories Specifications HI764 (Marine ULR) HI767 (Marine LR) Range 0 to 200 ppb (as NO –º-N) 0 to 999 ppb (as NO –º-N) Resolution 1 ppb 1 ppb Accuracy ±10 ppb ±4% of reading @ 25 °C (77 °F) ±10 ppb ±4% of reading @ 25 °C (77 °F) Light Source Light Emitting Diode @ 525 nm Light Emitting Diode @ 470 nm Light Detector Silicon photocell Method Adaptation of the EPA Diazotization Method 354.1. The reaction between nitrite and the reagent causes a pink 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 and 2 minutes after reading After 20 minutes of non-use and 4 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 HI764 Checker®HC is supplied with sample cuvette and cap (2 pcs.), Marine Nitrite Ultra Low Range reagent starter kit (reagents for 6 tests), 1.5V AAA Alkaline battery (1 pc.), instruction manual. HI767 Checker®HC is supplied with sample cuvette and cap (2 pcs.), Marine Nitrite Low Range reagent starter kit (reagents for 10 tests), 1.5V AAA Alkaline battery (1 pc.), iunstruction manual. Reagent Set HI764-25 Reagents for 25 Nitrite Ultra Low Range tests HI767-25 Reagents for 25 Marine Nitrite Low Range tests Calibration Set HI764-11 Nitrite Ultra Low Range certified standard kit HI767-11 Marine Nitrite Low Range certified standard kit HI764 Ð HI767 Marine Nitrite Low Range and Marine Nitrite Ultra Low Range Handheld Colorimeters • Easier to use and more accurate than chemical test kits • Dedicated to a single parameter • Small size, big convenience Nitri¡cation is the biological oxidation of ammonia (ammonium ion) into nitrite, followed by the oxidation of nitrite to nitrate. The ¡rst step of this two-step process is carried out in an aquarium by nitrifying bacteria. During this process, the ammonium levels drop while the nitrite levels increase. Since nitrite is just as harmful as ammonia, nitrite levels should be maintained at immeasurable levels. A mature biological ¡lter should be able to keep nitrite levels low. HI767 and HI764 Checker®HC Handheld Colorimeters bridge the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate, while professional instrumentation can cost hundreds of dollars and can be time-consuming to calibrate and maintain. Hanna Checker HC’s are accurate, aordable, and easy to use. To begin measurements, ¡rst zero the instrument with your water sample. Next, add the reagent. Last, place the vial into the Checker HC, press and hold the button for 3 seconds to start reaction timer. The reading will be taken automatically and the results displayed. It’s that easy. The contoured style of the Checker HC ¡ts in your palm and pocket perfectly 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. | www.hannainst.com 10 10.160 Photometers Checker®HC
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