HI97720 · HI97719 Hardness Standard Method 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 Signi¡cance of Use Water, with exception to distilled water, contains dissolved salts (magnesium and calcium carbonates). The concentration of these salts determines the water hardness, which can be expressed in calcium carbonate or magnesium carbonate. The sum of these two represents the total hardness level. In addition, water hardness is also related to the phenomenon of pipe rusting in water heating and cooling systems, reverse osmosis, and demineralization plants. Specifications HI97720 Ca Hardness HI97719 Mg Hardness Measurement Range 0.00 to 2.70 mg/L (ppm) (as CaCO² ) 0.00 to 2.00 mg/L (ppm) (as CaCO² ) Resolution 0.01 mg/L Accuracy @25°C (77°F) ±0.11 mg/L ±5% of reading Method adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th ed. Calmagite method adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th ed. EDTA colorimetric method. Measurement System Light Source light emitting diode Bandpass filter 525nm 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 HI97720 and HI97719 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 HI97720C and HI97719C includes photometer, CAL Check standards, sample cuvettes (2), sample caps (2), plastic stoppers (2), 1.5V AA batteries (3), 1 mL syringe with tip, cuvette wiping cloth, CAL Check standard certificate, instrument quality certificate, instruction manual, and rigid carrying case. Reagents sold separately Reagents and Standards HI97720 HI97720-11 CAL Check standard cuvettes for calcium hardness HI93720-01 calcium hardness reagents for 100 tests HI93720-03 calcium hardness reagents for 300 tests HI97719 HI97719-11 CAL Check standard cuvettes for magnesium hardness HI93719-01 magnesium hardness reagents for 100 tests HI93719-03 magnesium hardness reagents for 300 tests See page 10.128 for standard reagents; see page 10.129 for CAL Check kits; see page 10.66 for general accessories 10 Photometers 10.84 | www.hannainst.com portable
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