Residual Chlorine Monitor AW401Residual chlorine is one of the most important measurements for the effective monitoring of cooling, potable and industrial water treatment processes. ABB's new Residual Chlorine Monitor AW401 incorporates the features our customers need to monitor and control residual chlorine levels accurately and affordably. The design enables users to either connect up to three residual chlorine monitoring sensors to the system or to combine pH, ORP and residual chlorine sensors, thus reducing the cost of each measurement considerably.Total and Free Residual Chlorine Measurementadd potassium iodide to reagent to convert free chlorine measurement to total chlorineReagentless Operationreduced operating costs with reagentless operation at a pH of 7.5 or lessMultiple Sensor Input Capabilityreduced installation costs for multiple point monitoring operationsSelf Cleaning Sensor Assemblyprolongs sensor life and maintains accuracyResidual Chlorine Controller AW402Residual chlorine is one of the most important measurements for the effective monitoring of cooling, potable and industrial water treatment processes. ABB's new Residual Chlorine Controller AW402 incorporates the features our customers need to monitor and control residual chlorine levels accurately and affordably. The design enables users to either connect up to three residual chlorine monitoring sensors to the system or to combine pH, ORP and residual chlorine sensors; thus reducing the cost of each measurement considerably.Total and Free Residual Chlorine Measurementadd potassium iodide to reagent to convert free chlorine measurement to total chlorineReagentless Operationreduced operating costs with reagentless operation at a pH of 7.5 or lessMultiple Sensor Input Capabilityreduced installation costs for multiple point monitoring operationsSelf Cleaning Sensor Assemblyprolongs sensor life and maintains accuracy