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Disinfection and chlorine sensors and transmitters

Products for reliable measurement of chlorine and bromine based disinfectants

Chlorine sensors and transmitters for drinking water, reuse water and pool water disinfection

Systematic disinfection is an essential step in water treatment and legally required in many areas to protect people and systems. However, high doses of disinfectants can be toxic. Our sensors for free chlorine, chlorine dioxide, total chlorine and free bromine monitor drinking water, process and reuse water, pool water or seawater to ensure regulation-compliant disinfection. Click the button below to find out how our disinfection sensors and transmitters can support also your application.

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Bromine and chlorine sensors and transmitters

Our product finder helps you to search for suitable measuring devices, software or system components via product characteristics. Applicator leads you through an individual product selection via application parameters.

The selection of our bromine and chlorine sensors and transmitters depends on the application:

Free chlorine is the most important disinfectant in water treatment due to its easy handling and strong disinfecting effect. Free chlorine sensors are applied in:

  • Drinking water - to ensure sufficient disinfection
  • Food - to provide hygienic bottling and packaging
  • Pool water - to dose disinfectant efficiently

Chlorine dioxide is more and more becoming a disinfectant of choice since it is less corrosive and independent from the pH value. Chlorine dioxide sensors are applied in:

  • Cooling systems or towers
  • Drinking water
  • Wash water for packed vegetables
  • Desalination plants to prevent ClO2 from disturbing reverse osmosis

Total chlorine is a good indicator of residual disinfectants in discharge water. The sensors are used in WWTPs:

  • To measure the effluent water's disinfection status.
  • To control reuse of water

Free bromine is often used in applications with seawater because of the unique chemical properties of this medium. Free bromine sensors are applied in:

  • Seawater reuse and process water
  • Desalination plants
  • Fish farming
  • Cooling systems characterized by high pH values
  • Thermal spas

Ozone is frequently used for pretreatment and disinfection in the water treatment process because of its efficiency. Ozone sensors are applied in:

  • Wastewater
  • Drinking water
  • Process water

Amperometric measuring principle

Sensors for chlorine dioxide measurement feature a working electrode, which is separated from the medium by a thin membrane. Chlorine dioxide coming from the medium diffuses through this membrane and is reduced at the working electrode. The circuit is completed by means of the counter electrode and the electrolyte. The electron reduction at the working electrode is proportional to the concentration of chlorine dioxide in the medium. This process works in a wide pH and temperature range.

Measuring free available chlorine is similar. Here, hypochlorous acid diffuses through the membrane and produces a reaction. The presence of hypochlorous acid in the medium depends on the pH value. This dependency is compensated by means of pH measurement in the flow assembly and balancing in the transmitter.

Measuring free bromine works very similar to free chlorine measurement but is possible in a more alkaline range.

For the measurement of total chlorine, hypochlorous acid and additionally chloramines play a role in a complex system of reactions.


  • With us you get the full range of instruments for water disinfection monitoring: free chlorine sensors, total chlorine sensors, chlorine dioxide sensors and free bromine sensors with matching transmitters and accessories.
  • Our chlorine sensors and transmitters and bromine sensors meet all requirements from basic functionality up to multichannel and multiparameter measurement .
  • To provide you with full flexibility, our chlorine probes and bromine probes are designed both for use in channels and basins as well as for installation in flow assemblies .
  • Check out our ready-to-use disinfection monitoring panels . They come fully equipped with sensor, transmitter, assembly, filter, check valve, sampling tab, etc. and provide you with a complete and compact measuring point.

Disinfection applications in waterworks and sewage plants

These benefits help to optimize disinfectant dosing and and the effort in installation, operation and maintenance in the water and wastewater industry. Find out how this is put into practice in applications, such as ozonization in waterworks or chlorine monitoring in effluents.