- August 04, 2017
August 4, 2017— The CD80 Chlorine Dioxide Analyzer from Electro-Chemical Devices (ECD) is designed to provide process engineers responsible for municipal and industrial water treatment systems with a solution to measuring Chlorine Dioxide (ClO2) for disinfection, effluent treatment, pulp bleaching and cooling or rinse water applications.
The CD80 ClO2 Analyzer is a complete panel mounted system that is ready to install right out of the box by technicians without special tools or training. Connect the sample and drain lines, connect the power and outputs, and it is ready to go in less than 30 minutes. The CD80 Analyzer’s S80 amperometric ClO2 sensor is factory pre-calibrated by DPD comparison.
With its complete plug and play design, the CD80 Analyzer incorporates a flow control device, an amperometric ClO2 sensor, an optional pH sensor and the universal T80 Analyzer/Controller all mounted on a PVC panel. The intelligent S80 amperometric sensor recognizes the T80 Analyzer/Controller for automatic configuration set-up. Amperometric sensors are flow sensitive, which is managed by the onboard flow control device. The sensor cell also includes a temperature sensor to allow the T80 Analyzer/Controller to provide automatic temperature compensation.
It is available with a choice of two measurement ranges: either 0.05 to 20 ppm high range or a 0.01 to 5.00 ppm low range. An optional pH sensor is available with a range of 0 to 14 pH.
ClO2 is a disinfectant for water treatment against a number of pathogens and as a bleaching agent in pulp production and other industrial processes. According to the U.S. EPA, ClO2 can be applied at several points during drinking water treatment: to the raw water as a pre-oxidant, to the clarification tank, to post-clarification, or to the filtered water as primary disinfectant. Chloramine or chlorine can then be used for secondary disinfection following chlorine dioxide application.
During actual measurement, ClO2 diffuses through the S80 amperometric sensor’s PTFE membrane and is reduced to chloride ions by the addition of electrons from the sensor’s cathode. Silver from the sensor’s anode is then oxidized to silver chloride. The electrons are released from the gold cathode and the electrons are then accepted on the silver anode, which results in a current flow that is proportional to the ClO2 level in the solution.
The CD80’s universal T80 Analyzer is powered by 110-240 Vac or 24 Vdc and allows either ClO2 measurement range parameter to be graphically displayed with a user-definable line, bar or gauge style graph. The standard configuration features two 4-20 mA outputs with three alarm relays and a MODBUS RTU. An optional auto clean configuration is available. It includes a solenoid actuated spray cleaner, which uses either 30 psi process water or air for sensor cleaning. A timer controls the period and duration of the cleaning cycle.