The Hach CL17 Chlorine Analyzer uses colorimetric DPD chemistry to continuously monitor water for free or total residual chlorine. This low-cost analyzer provides a dependable and economical alternative to instruments that rely on costly electrodes or complex procedures. Unaffected by even large swings of pH, the CL17 performs an analysis every 2.5 minutes, 24 hours a day. The CL17 offers both an alarm for manual chlorine feed control and a 4-20 mA output for automatic control of chlorine feed pumps for drinking water, wastewater and other water applications. Set for manual control, the instrument notifies the operator of out-of-limit chlorine levels - and allows manual intervention in the disinfection process as needed. The CL17 can be set for automatic control of chlorine feed pumps using one of two methods: On-Off Control - Which turns the feed pumps on when chlorine levels fall too low for disinfection and off when levels rise above a pre-set limit. Proportional Control – Which control the amount of chlorine in proportion to the strength of the CL17’s output signal. This done through the REC MIN and REC MAX keys. For automatic operation, the CL17 has one output control with a range of 4-20 MA, programmable over any portion of the instrument’s 0-5 mg/L range. The unit is housed in an abs plastic case that is lightweight, shatterproof and corrosion resistant. The case includes built-in mourting bracket that simplify installation. Two windows clearly show chlorine measurements, alarms and reagent levels. A hinged door allows quick access to internal components. The CL17 is designed to operator continuously for up to 30 days without replacing reagents or cleaning the sample cell. Because of its low reagent use, low maintenance requirement and its ability to prevent overfeeding, the CL17 is exceptionally cost-efficient.

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