Chlorine

1
Chlorine Chlorine Dioxide

• Overview

2
Free Chlorine

• Free Chlorine exists as
• Hypochlorite Ions OCl
• Hypochlorous Acid (HOCl)

3
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
Guide to Chlorine Requirements
5
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)