Model 499AOZ Dissolved Ozone Sensor

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RUGGED CONSTRUCTION. EASILY REPLACEABLE MEMBRANE, no special tools required. AUTOMATIC COMPENSATION for changes in membrane permeability with temperature. AUTOMATIC PRESSURE EQUALIZATION to maintain correct membrane tension. COMPATIBLE with most Delta and Rosemount Analytical Analyzers. VARIOPOL CONNECTOR OPTION allows the sensor to be replaced without running new cable.

FEATURES The Model 499AOZ sensor is intended for the continuous determination of dissolved ozone between 0 and 3 ppm. The primary application is ozonation basins in municipal water filter plants. Pretreating the raw water with ozone reduces the amount of filter acid chemicals needed and reduces the amount of chlorine required to disinfect the finished water. Lowered chlorine dosage means a reduced level of harmful chlorination by-products in the finished water. Ozone is also used as disinfectant in bottling and food processing plants The Model 499AOZ is a membrane-covered amperometric sensor. The sensor consists of a gas-permeable membrane stretch tightly over a gold cathode. A silver anode and electrolyte solution complete the internal circuit. During operation, ozone difuses from the sample through the membrane. Once inside the sensor, the ozone reacts with the electrolyte solution to form an intermediate compound. A polarizing voltage applied to the cathode completely reduces the intermediate. The reduction produces a current between the cathode and the anode, which the analyzer measures. The current is directly proportional to the rate at which ozone diffuses through the membrane into the sensor, which ultimately proportional to the concentration of ozone in the sample.