Free chlorine, chlorine dioxide and ozone measuring cells
November 2003
Analytical Instrumentation & Environmental Monitoring
Jumo's membrane-covered, amperometric measuring cells are used to determine the concentration of free chlorine, chlorine dioxide or ozone in aqueous solutions (such as in drinking or pool water as well as in service, process or cooling water). The cell for free chlorine can be applied to determine the following inorganic chlorination agents: chlorine gas, electrolytically produced chlorine, sodium hypochlorite, calcium hypochlorite or chlorinated lime.
The cell for chlorine dioxide is available for measuring chlorine dioxide in chlorite/chlorine and chlorite/hydrochloric acid plants. By using the cell for ozone, it is also possible to measure electrolytically produced ozone, for example. The disinfectant (Cl2, ClO2, O3) diffuses through the sensor membrane into the electrode chamber filled with electrolyte, which contains the gold cathode and the silver/silver chloride anode. Since the sensor operates in the diffusion limiting-current range, every disinfectant molecule that reaches the cathode surface is immediately reduced.
A corresponding reaction takes place at the anode. The electrical current produced by the electrode reaction is proportional to the disinfectant concentration in the solution and serves as a measurement signal, after the appropriate conversion and calibration. In the course of calibration, only the slope has to be calibrated (reference value of DPD determination). Membrane-covered cells from Jumo do not require calibration of the zero point.
The integral electronics of the cells provides a temperature-compensated 4 to 20 mA current signal. Calibration is performed through a connected instrument - indicator, controller, recorder, PLC, etc. The measuring cells can be directly interfaced to a suitable indicator/control instrument.
For more information contact Anastas Schnippenkotter, ASSTech Process Electronics & Instrumentation, 011 794 7057.
Further reading:
The importance of environmental monitoring and visibility at data centres
Legrand
Analytical Instrumentation & Environmental Monitoring
Data centres are one of the most energy-intensive building types, consuming up to 50 times the energy per floor space compared to a typical commercial office building. With organisations embracing advanced technologies, data centres powering these technologies are under increasing pressure around the globe to increase capacities and improve efficiencies.
Read more...
Analysers for use in high ambient temperature environments
Analytical Instrumentation & Environmental Monitoring
The 993X series of analysers from Ametek Process Industries are now IECEx Zone 2 certified for use in locations with up to 60°C ambient temperature. Built with IP66-rated enclosures and using an integrated cooling system, they can be installed outdoors or in minimally temperature-controlled enclosures, reducing complexity while lowering capital and operating costs.
Read more...
ATEQ is adapting to evolving markets
ATEQ South Africa
Analytical Instrumentation & Environmental Monitoring
ATEQ is a global company that has established itself as a world leader in leak test technologies and industrial quality control equipment. The company’s mission is to help its customers remain compliant with regulations and maintain product quality through its range of support services.
Read more...
The art of precision measurement
Analytical Instrumentation & Environmental Monitoring
To achieve precise, reliable measurement results when scanning component parts, use is frequently made of reference points. In optical measuring processes, these permit the referencing of three-dimensional objects during the digitisation.
Read more...
Vibration test system supports international space industry
TANDM Technologies
Analytical Instrumentation & Environmental Monitoring
Dragonfly Aerospace has launched EOS SAT-1, one of seven satellites in the world’s first agricultural-focused constellation. With optimisation of resources being a key component for Dragonfly, it called on TANDM to assist in creating and heavily expanding its environmental testing capabilities by providing a vibration test system that allowed it to perform in-house vibration and shock testing.
Read more...
Sensor technology for brewing
Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
Brewing is a delicate balance, blending tradition with innovation. Now, modern sensor technology is stepping in to perfect the art of fermentation.
Read more...
Loesche gets dirty
Loesche South Africa
Analytical Instrumentation & Environmental Monitoring
The world’s attention is on environmental sustainability, and the pressure on countries and companies to demonstrate their commitment to preserving the environment and preventing climate change is at an all-time high. As we confront a multitude of environmental and social challenges, managing waste and maximising landfill diversion can play a key role.
Read more...
Water systems with energy savings and sustainability
Labotec
Analytical Instrumentation & Environmental Monitoring
ELGA Veolia has relaunched its award-winning PURELAB flex range, with features to reduce the system’s environmental footprint and incorporate some of the latest innovations in water purification technologies. The ecological improvements integrated into the flex range have been made to reduce water and power consumption.
Read more...
Keeping an eye on invisible radiation
Omniflex Remote Monitoring Specialists
Analytical Instrumentation & Environmental Monitoring
At its peak in 1994, the energy generation capacity of the UK’s nuclear power stations was 12,7 GW across 16 plants. In 2024, the capacity has fallen to around 5 GW, and the number of stations is down to nine. However, this is far from the end of the story as spent nuclear fuel remains radioactive for centuries, and requires rigorous safety processes to safeguard against leaks.
Read more...
Technology for water sustainability
Endress+Hauser South Africa
Analytical Instrumentation & Environmental Monitoring
The sustainability of surface water is critical for South Africa’s economic development, social well-being and environmental health. Endress+Hauser has a full range of liquid analysis sensors and transmitters to measure important parameters and has an excellent global track record in water and wastewater process plants and various surface and industrial water monitoring sites.
Read more...
printer friendly version