HI97707 · HI97708 Nitrite, Low and High Range Portable Photometers • Advanced LED optical system · Innovative optical design that utilizes a reference detector and focusing lens to eliminate errors from changes in the light source and from imperfections in the glass cuvette. · LEDs have a much higher luminous efficiency, providing more light while using less power. They also produce little heat, which could otherwise affect electronic stability. • CAL Check™ · Validate instrument performance at any time using CAL Check cuvettes made with NIST traceable standards. The CAL Check screen guides the user step-by-step through the validation process and user calibration. • On-screen tutorial mode with animations · Guides users step-by-step through the measurement process • Waterproof and floating IP67 case • Unit of measure is displayed along with reading • Built-in timer · Built-in reaction timer that ensures consistency between tests. • Error messages on display · Alerts to problems including no cap, high zero, and standard too low • GLP data · Displays the last calibration date. • Auto logging • Battery status indicator • Auto-shut off Specifications HI97707 Nitrite, LR HI97708 Nitrite, HR Measurement Range 0 to 600 µg/L (as NOº-N) 0 to 150 mg/L (ppm) (as NOº-N) Resolution 1 µg/L 1 mg/L Accuracy @25°C (77°F) ±20 µg/L ±4% of reading ±4 mg/L ±4% of reading Method adaptation of an EPA approved diazotization method adaptation of the Ferrous Sulfate method Measurement System Light Source light emitting diode Bandpass filter 466 nm 575 nm Bandpass filter bandwidth 8 nm Bandpass filter wavelength accuracy ±1.0 nm Light Detector silicon photocell Cuvette type round 24.6 mm diameter (22 mm inside) Additional Specifications Auto logging 50 readings Display 128 x 64 pixel B/W LCD with backlight Auto-off after 15 minutes of inactivity (30 minutes before a READ measurement) Battery type / Life alkaline 1.5 V AA (3) / > 800 measurements (without backlight) Environment 0 to 50°C (32 to 122°F); 0 to 100% RH, non-serviceable Dimensions 142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0") Weight 380 g (13.4 oz.) Ordering Information HI97707 and HI97708 are supplied with sample cuvettes (2), sample caps (2), plastic stoppers (2), 1.5V AA batteries (3), instrument quality certificate, and instruction manual. CAL Check standards and testing reagents sold separately HI97707C and HI97708C includes photometer, CAL Check standards, sample cuvettes (2), sample caps (2), plastic stoppers (2), 1.5V AA batteries (3), scissors, cuvette wiping cloth, CAL Check standard certificate, instrument quality certificate, instruction manual, and rigid carrying case. Reagents sold separately Reagents and Standards HI97707 HI97707-11 CAL Check standard cuvettes for nitrite LR HI93707-01 nitrite LR reagents for 100 tests HI93707-03 nitrite LR reagents for 300 tests HI97708 HI97708-11 CAL Check standard cuvettes for nitrite HR HI93708-01 nitrite HR reagents for 100 tests HI93708-03 nitrite HR reagents for 300 tests Signi¡cance of Use Nitrites can be harmful to aquatic organisms even in low concentrations and for this reason, they are closely monitored in aquaculture facilities. In cooling towers, however, an adequate amount of nitrites is necessary to prevent corrosion. In high concentrations, they can be harmful to the environment and to humans. They are, therefore, normally monitored to verify the quality of water for domestic use, as well as lakes and ponds. Nitrites are an intermediate product in the nitrogen cycle and are produced by ammonia oxidation with water, or even originate in industrial waste directly. They must not be present in drinking water. See page 10.128 for standard reagents; see page 10.129 for CAL Check kits; see page 10.66 for general accessories 10 Photometers 10.93 www.hannainst.com | portable
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