WATER / WASTEWATER 21
shield that is mounted on bolts. Grease tends to accumulate in the gaps that result from this setup, however, which means the problem just moves to another location, as clumps of fi bres, grease and sludge form the wastewater continue to impair correct measurements.
In the case of Newport News, city offi cials contacted KELLER AG für Druckmesstechnik, whose 36 XKY level transmitter, which is known in the USA as the LevelRat, enables a unique approach to wastewater level measurement.
The Kynar® membrane used in the 36 XKY is harder and offers 36 XKY level transmitter with Kynar® membrane
superior abrasion and puncture resistance relative to other non- fouling solutions. Bulky shields are therefore no longer needed, which also enables a more compact design for the sensor. The 36 XKY can fully exploit the advantages offered by a non-fouling membrane without anyone having to worry about fl oating particles and small objects. Put simply, the level transmitter is perfect for this application. No incorrect measurements due to grease deposits have been recorded at Newport News Waterworks since the new transmitters went into operation: The LevelRat solved the problem.
A simple and effective solution to chlorine generation
Chlorine (Cl2) has always been a diffi cult gas to handle when using traditional gas cylinders. It is very reactive and problematic in terms of accuracy and its erratic shelf life. This has made life diffi cult for personnel working across a wide range of industries, such as in the water treatment sector.
With this in mind, Euro-Gas designed and developed their GazCal Gas Generator, which is now an indispensable tool for people working with chlorine gas. Engineers within the water industry fi nd this rugged, portable and battery-operated tool ideal for testing and calibration, both in the lab and in the plant. The GazCal comes in a robust and compact carrying case and enables rapid testing and calibration with negligible warm-up time. This simple to use device can be operated by anyone! Simply set the necessary PPM level via the unit’s dial-up digital display and it is ready for action. The Gazcal generates Cl2 levels ranging from 0.5 – 20 ppm and is also suited to act as a surrogate for cross-calibration of ClO2
, O3 and F3.
Euro-Gas have designed the GazCal to overcome the usual problems of a low shelf life. Cell life is only used up when the unit is in operation, whilst traditional cylinders can simply die out after up
to 6 months. The generator can therefore last for up to a decade, often without the necessity to change the cell and needing only a yearly recertifi cation of calibration, which can be carried out by Euro-Gas or qualifi ed technicians at the site.
The GazCal cell has a lifetime of 500ppm hours, equating to 100 hours of constant use at a 5ppm concentration level, which enables a minimum of 400 individual calibrations. Operators can see the life span of the generating cell on the unit’s cell life indicator. Once the cell is used up, a new generating cell can be installed easily. Depending on the level of experience that the engineer has with gas detection calibration, regular small gas cylinders will usually only perform around 5 – 10 calibrations per cylinder. The GazCal may initially be more costly than a small cylinder but in the longer term, the generator will be far more economical.
Moreover, gas cylinders only attain one specifi c concentration per cylinder purchased, say for instance 5ppm of Cl2, whereas the GazCal is totally adjustable between the 0.5ppm to 20.0ppm range and in 0.1ppm steps. Therefore, the Gazcal produces many different concentration levels from one device. In addition, low concentrations of Cl2 are effi ciently produced with the GazCal, even 1ppm and 2ppm levels, whereas it is extremely problematic to achieve cylinder stability at low concentration levels.
More information online:
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pressure measurement. With an 80 GHz radar sensor from Vega, for example, you’ll fi nd a number of improvements over previously widespread measuring technologies like ultrasonic.
A family-owned company with more than 1,600 employees worldwide, Vega has developed a product series that is perfectly suitable for the challenging requirements found in the water and wastewater industries. Decades of research and experience have resulted in intelligent electronics and a sleek sensor design. Exceptionally short signal propagation times calculated with high-frequency signals, a measurement unaffected by temperature, pressure or vacuum, and a sensor unaffected by condensation or build up are all big leaps for instrumentation in the water and wastewater industries. These new Vega radar sensors accurately measure within a millimetre without a blocking distance at the antenna. They safely and reliably provide level measurements for a long time – even if they become fl ooded.
email: For More Info, email: email:
Simple, durable and customer-oriented: These key words describe the path VEGA has taken for its sensor portfolio, but also for its partnership-based cooperation. The instruments are distinguished by a fast setup and commissioning, fl exible connection systems and intuitive operation.
Vega combines classic level and pressure measurement with the digital world. Legal regulations and the natural environment demand even higher reliability, accuracy and faster reaction times, and Vega relies on standards that enable fast and error-free connection. A Bluetooth function integrated in all sensors allows for remote adjustment with a mobile phone or tablet. Reliable measured values don’t get from A to B any easier.
More information online:
ilmt.co/PL/e2eP For More Info, email:
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WWW.ENVIROTECH-ONLINE.COM IET Annual Buyers’ Guide 2020/21
The new VEGAPULS instrument series is available both as a compact version with cable connection housing (left in the photo) and as standard version with fi xed cable connection (IP68).
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Reliable level and pressure sensors for the water and wastewater industries In the water and wastewater industries, it is worth taking a closer look at the topic of level and
Contact Details KELLER AG für Druckmesstechnik • St. Gallerstrasse 119, CH-8404 Winterthur • Tel: +41 52 235 25 25 • Email:
info@keller-druck.com • Web: www:
keller-druck.com
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