HI97104 Ð HI971044 pH, Alkalinity, Free and Total Chlorine and Cyanuric Acid Portable Photometer The HI97104 and HI971044 portable photometers measure ¡ve important parameters in the treatment and disinfection of drinking water, wastewater and swimming pools. • 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 Chlorine is a widely used disinfectant, and in order for it to be eective, the pH of the water should be less than 8.0. Alkalinity is buering capacity of the water, when alkalinity values are low the pH will be hard to maintain. In swimming pools, spas, and similar applications, cyanuric acid helps to increase the life of chlorine by stabilizing it and preventing its breakdown, especially in sunlight. Frequent testing of both cyanuric acid and pH helps to minimize chlorine consumption. 10 Photometers 10.110 | www.hannainst.com portable
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