1. File Name: Chlorine.pptFeb 2001 Chlorine & Chlorine Dioxide Overview

2. File Name: Chlorine.pptFeb 2001 Free Chlorine  Free Chlorine exists as Hypochlorite Ions OCl Hypochlorous Acid (HOCl)

3. File Name: Chlorine.pptFeb 2001 Free Chlorine Sensor  ORP Reaction HOCl diffuses through the membrane and is reduced at the gold cathode to chloride ions and hydroxide ions. Silver is oxidized to silver chloride at the anode.  The current flow is directly proportional to the free chlorine concentration.

4. File Name: Chlorine.pptFeb 2001 Guide to Chlorine Requirements

5. File Name: Chlorine.pptFeb 2001 Chorine and Chlorine Dioxide  Free Chlorine Sensors Model 140 0.05 to 20 mg/l (ppm) Model 141 Trace 0.01 to 5 mg/l (ppm)  Chlorine Dioxide Sensors Model 240 0.05 to 20 mg/l (ppm) Model 241 Trace 0.01 to 5 mg/l (ppm)