Dissolved oxygen meter stays accurate over decades
February 2003
Analytical Instrumentation & Environmental Monitoring
It is the dream of any technician working on a high-accuracy plant, such as wastewater, to have instruments that are still accurate after 10 years of operation - even if it means having to manufacture these instruments from gold and silver. Danfoss says that it has turned this dream into reality with the development of its Ole_LINK1EVITA* OXY dissolved oxygen sensor.
Using gold as cathode and a silver wire as anode, the EVITA meets the toughest environmental standards, offers high accuracy and introduces flexible pricing through a modular design. It also lays claim to the industry's only truly disposable Clark oxygen sensor - replaceable in just five minutes.
"Whether you are equipping a single-basin installation or an entire computer-controlled plant, this product range allows you to meet your exact price/performance requirements through a diverse choice of components and configurations," says Mick Baugh, Danfoss business unit manager, motion control and flow.
With a turndown of 1:1000 and automatic compensation for temperature, pressure, relative humidity and salt concentration, EVITA more than complies with the high-accuracy standards of EN 25814. In addition, the five-minute-replacement disposable oxygen sensor means it can still be equally accurate after a decade of operation.
The device requires no special cables, nor are there any complicated diagrams to be followed. "You simply press a button and the system calibrates itself," says Baugh. "There is no need to calibrate the zero point either, as the low-cost disposable sensor gets replaced before zero-point calibration becomes necessary."
EVITA also keeps an eye on itself through a comprehensive self-monitoring program, and instantly lets the operator know if there is a problem with the sensor, transmitter, cable or electronics. Unique features include real membrane leakage detection, which allows faults in the sensor membrane to be detected within 35 seconds, using direct resistance measurement. Similarly, real sensor lifetime monitoring ensures continuous accuracy. EVITA also incorporates an oxygen profile controller for lifetime economy.
"One of the biggest advantages of EVITA, is that it needs vastly less maintenance than traditional oxygen meters," says Baugh. "Maintenance checks are needed only 2 to 6 times a year." An 'auto clean' floating ball uses the water's motion to clean the sensor membrane, negating the use of chemicals, fresh water or power.
Danfoss has sold more than 70 000 sensors over 20 years of operation in oxygen measurement and has focused on developing products that are more accurate, simpler to use and less costly. Testimony to the success of this approach can be seen in the company's growing market share throughout Europe, North America, Africa and Asia.
For more information contact Mick Baugh, Danfoss, 011 803 8390, [email protected], www.danfoss.co.za
Further reading:
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...
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...
Reducing water consumption in the cement industry
Loesche South Africa
Analytical Instrumentation & Environmental Monitoring
Water is a finite and irreplaceable resource, fundamental to life on earth. LOESCHE’s vision is to enable its customers to produce high-quality cement, without any water consumption.
Read more...
Ensuring occupational health and safety in mining
Analytical Instrumentation & Environmental Monitoring
Probe Integrated Mining Technologies (Probe IMT) has partnered with M3SH Technology to offer state-of-the-art environmental monitoring solutions that address these dual requirements.
Read more...
printer friendly version