ECD Offers New CDA-22 Chlorine Dioxide Analyzer
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Electro-Chemical Devices

Device is recommended for freshwater treatment plant filtration systems

Electro-Chemical Devices (ECD) has introduced the CDA-22 Chlorine Dioxide Analyzer, which is designed to support raw water treatment filtration systems. Featuring a panel-mounted plumb-and-play design and automatic flow control, the CDA-22 is a complete chlorine dioxide (ClO2) measurement system.

The CDA-22 Chlorine Dioxide Analyzer can run for up to one year between electrolyte/membrane changes. It incorporates a CIO2 sensor, an automated flow control device and an analyzer/controller mounted on a PVC panel. Installation is completed after connecting the sample and drain lines, power and outputs, and calibration is accomplished with DPD comparison.

The CDA-22 features a polarographic gold/silver PTFE membrane amperometric CIO2 sensor. While these types of sensors are flow-sensitive, the CDA-22's output is virtually flow-independent at values greater than 0.5 ft/sec. The CDA-22’s "constant head" flow control device maintains the sensor’s optimum flow over a wide range of incoming sample flow rates, from 10–80 gal/hr.

The CDA-22’s sensor operates at a wide temperature range of 0 to 100ºC (32 to 212°F). Because temperature affects the CIO2 permeability of the PTFE membrane, increasing the temperature increases the output of the sensor approximately 4% per C°. The chlorine flow cell includes a temperature sensor that allows the C22 analyzer to perform automatic temperature compensation of the measurement.

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