22 Water/Wastewater Experts Convinced by Process for Automatic Cleaning of Electrodes
An electrolytic cleaning process has been used for many years for cleaning metal surfaces prior to galvanic refining processes. The new automatic electrode cleaning "AER" developed by dinotec Water Technology (Germany) makes use of this proven electrolytic process in a greatly improved form, offering the user new benefits.
A thorough cleaning of the electrode surface with this process is unfortunately accompanied by an unintended, strong polarisation of the electrode. The disadvantage is that, after the cleaning and depending on the water quality, there is a certain time lag before the correct measured value is reset. It can take an hour or longer until a correct measurement signal is available. The computation algorithms used for an error correction in this case often fail to achieve the desired result.
With the new "AER" electrode cleaning process, dinotec Water Technology ensure that a reliable measurement signal is available within a short time without requiring a mathematical correction. In addition, the "AER" system automatically tests the measurement system for a correct function after the actual cleaning process (duration <10 s). This means additional safety for the operator.
Professionals are particularly impressed that measuring systems with the new "AER" automatic electrode cleaning even work in salt water. No special sensors are required in this case.
The new "AER" offers considerable advantages compared to a mechanical cleaning of electrodes: The polarising layer necessary for measurement is not adversely affected. As a result, there is no zero point error in the measurement. This proves to be an advantage especially with small measured values; The "running-in period" of the measurement is short. Contrary to conventional systems with mechanical cleaning, the measurement system must not be recalibrated; There are no new running-in periods, such as after an interruption of the mechanical cleaning e.g. due to a lack of sample water; The measurement accuracy is independent of the consistency of the sample water quantity and the resulting reproducibility; Unlike conventional processes, the electrode is wear-free.
Compared with a mechanical cleaning of the electrode with sand or glass beads, the new automatic electrode cleaning "AER" thus provides remarkable benefits. Christoph Scheffold, product manager and developer of the AER, "We have been testing the AER for months, even in problematic applications. The results have been consistently positive and experts have been impressed."
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Are you interested in what you have read but want to know more?
Intelligent Measuring System for Dissolved Oxygen In addition to measuring the pH
value and conductivity, determining the concentration of dissolved oxygen is an important task in aqueous analytical measurement. For this purpose, JUMO (Germany) presents the ecoLine O-DO – a new digital sensor based on a visual measurement procedure (luminescence method). Unlike conventional electrochemical sensors, the optical sensor is characterised by a measurement that is low-drift, low-maintenance, and has great long-term stability. It is suitable for use in communal and industrial sewage treatment plants, drinking water monitoring, water protection, fish farms, and other applications.
The JUMO ecoLine O-DO saves the calibration data and calibration history straight to the head of the sensor. The robust sensor in a stainless steel case operates across a measuring range from 0 to 20 mg/l and can be used in a temperature range from 0 to 60 °C.
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New Breed of Electrochemical Pocket Meters
Incorporating 60 years of water quality analyser research and manufacturing technology into one pen sized simple design, testing has never been easier thanks to Camlab (UK).
The comprehensive range of pocket meters employs just three simple steps to achieving results. The meter is calibrated using the standards supplied, cleaned with pure water, the sample is added and the results are displayed. Everything you need to perform the test is included in a handy carry case for complete portability, including the standards, pipettes and sample sheets.
The range of meters which include, pH, Sodium, Potassium, Chloride, Calcium, Conductivity, Nitrate and Salt can perform measurements on a very small sample. The innovative design employs a flat sensor which allows the metre to accept samples as a single drop, a homogenised solid sample diluted with pure water, or a sample that has been absorbed onto a sampling sheet which is placed over the sensor. The sampling sheets allow the user to take samples from hard objects like glass, metal, textiles and films which would not be possible with other types of electrochemical meters.
Applications include water monitoring of aquaria, pools, rivers, lakes, drainage treatments, agricultural, fermentation and the food and drink industries.
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IET Annual Buyers Guide 2013
www.envirotech-online.com
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