Colorimetric process analyzer (DPD-method) for measurement and dosing control of disinfectants such as free chlorine, hypochlorus acid, chlorine dioxide, ozone, bromine, iodine and monochloramine.

  • For the continuous online determination of disinfectants based on the DPD colorimetric method (EN ISO 7393-2; APHA 4500 Cl-G.
  • Also applicable for water containing additives like corrosion inhibitors, cyanuric acid and antiscalants.
  • Measurement values: Free chlorine, chlorine dioxide, bromine and iodine, monochloramine or ozone.
  • Complete system including measurement and control electronics, photometer, flow indicator, reaction chamber, reagent dosing system and reagent containers.
  • Integrated pH measurement with temperature compensation (available as option).
  • All usual dosing devices for disinfectants and pH control can be connected either through relays or analog output signals. Two independent controllers can operate simultaneously.


  • pH option containing pH sensor, temperature sensor, cables and electronics board.
  • Third signal output selectable as:
    • Current signal output
    • Interface RS485 (Profibus DP or Modbus)
    • Logger download kit (with HyperTerminal)
  • Chemical cleaning module

Separate chemical cleaning module available as accessory.

Disinfectant measurement Measuring range [ppm] Accuracy
Ozone 0.000 1.000 ±0.005 ppm
HOCL, free chlorine, monochloramine 0.00 1.00 ±0.01 ppm
1.00 3.00 ±0.06 ppm
3.00 5.00 ±0.2 ppm
Chlorine dioxide, iodine, bromine 0.00 2.00 ±0.02 ppm
2.00 6.00 ±0.12 ppm
Response time 90% of change of excessive Cl in 60 seconds after sample entered flow cell.
Cycle time free chlorine 1 ... 12 min.
pH measuring range 2 ... 12
Temperature measuring range -30 ... 100 °C


Transmitter Specifications

Power Supply 100 ... 240 VAC, 50/60Hz or 24 VDC
Power consumption max. 30 VA


Sample conditions

Water consumption min. 10 l/h
Water inlet pressure 0.15 ... 2 bar
Sample temperature 5 ... 50 °C



Dimension 400 x 850 x 200 mm
Material PVC
Weight 9.0 kg

Codes II

  • Brand: Swan
  • Product Code: Codes II
  • Availability: In Stock

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