Water / Wastewater 43 A New Radar Level Sensor for Water-supply and Sewage Systems
The VEGAPULS WL S 61 radar sensor from Vega is ideal for all simple applications in the water-supply and sewage sectors. Featuring a wide range of mounting options, it is an especially cost-effective radar solution, because it can be readily integrated into existing infrastructures.
Just as with the VEGAPULS WL 61, which has been available for several years with a large installed base, the new VEGAPULS WL S 61 offers a design optimised for use in the water-supply and sewage sectors. Radar technology offers numerous advantages compared with ultrasonic sensors, which used to be standard in this sector; radar is independent of weather infl uences, strong sun, wind, fog or rain. In addition, no compensation is needed for variations in the signal transmission time due to air temperature fl uctuations. With an accuracy of +/- 5 mm, the VEGAPULS WL S 61 covers a wide range of applications.
This sensor is particularly suitable for level and fl ow measurement in water treatment plants. Its excellent focusing enables its use in pumping stations and rainwater overfl ow basins, for fl ow measurement in open channels, and for level monitoring.
The sensor’s robust housing is wear and maintenance-free, and its high degree of protection,
IP 68 (2 bar), also makes it suitable for applications where the sensor may be temporarily submerged. The unit complies with the latest LPR standard (Level Probing Radar), and is approved for open-air use without restrictions or special attachments.
In its development of this new sensor for simple measurement tasks, VEGA drew on its many years of experience. Today, almost 40,000 VEGAPULS WL 61 sensors are being successfully used worldwide in the water-supply sector.
An entirely new feature is Bluetooth wireless operation from a smartphone or tablet (and/or a PC with PACTware) when combined with a Bluetooth USB adapter; this makes commissioning and diagnosis even simpler. Corresponding display and signal processing units enable the display of measurements and provide the relay outputs needed, for example, to control a pump. For More Info, email:
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Accurate, Automatic and Direct BOD Measurement
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The Lovibond sensor system BD 600, from Tintometer, is a 6 sample system that allows precise measurements of BOD based on the manometric principle. Manometric respirometers relate oxygen uptake to the change in pressure caused by oxygen consumption while maintaining a constant volume. Thanks to the modern integral pressure sensors, it is no longer necessary to use mercury for pressure measurements.
The BOD values are stored automatically in the sensor memory in regulary intervals and can be called up with remote control on the large-format display at any time without the need for time-consuming conversion using factors. This means that test series that end on a Sunday can be evaluated during the following week without any problem. Measurement series can be stored on USB stick/SD card or transfered via USB cable to evaluate the datas on a computer.
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Flow Metering using Radar for Ex-Zone 1
The OFR fl ow sensor by NIVUS GmbH was approved for use in Ex-Zone 1 by TÜV Nord. In addition to ATEX approval required mainly in Europe the company was approved according to IECEx standard which is preferably demanded in English-speaking countries.
This allows contactless fl ow measurements in many applications including sewers. In order to obtain the Ex approvals a new sensor material was used and the sensor dimensions have been slightly modifi ed. A non-Ex version of the radar sensor continues to remain available.
The fl ow sensor features IP 68 protection and thus is suitable for use particularly in harsh
environments. In addition to the radar sensor NIVUS provide a modular holder bracket made of stainless steel for easy installation. The basic module enables mounting of the radar sensor. An extension allows installation of an extra IP 68 level sensor. Moreover the manufacturer provides an optional casing which covers both sensors in a compact enclosure.
Due to low space requirements the compact housing is suitable for installation even in cramped places or in locations where access is diffi cult. The contactless measurement and the compact construction of the radar system allow installation without the need to shut down processes.
Flow metering using radar sensors is suitable particularly for applications conducting aggressive or abrasive media. Another feature of the radar measurement system is the use in applications with shooting discharge and low fl ow levels.
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7359ad@reply-direct.com www.envirotech-online.com IET May / June 2017
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