x UK Focus - Water / Wastewater New Optical Sensor Cuts the Costs of Dissolved Oxygen Measurement


Problems associated with traditional dissolved oxygen sensing systems can now be eliminated using ABB’s new optical dissolved oxygen sensing system. Consistent, reliable and accurate, it can help operators to realise signifi cant savings through reduced energy consumption and maintenance.


Comprised of the ADS430 sensor and multi-channel transmitter, the system provides the highest levels of stability and accuracy for dissolved oxygen measurement. The ADS430 optical dissolved oxygen sensor uses Rugged Dissolved Oxygen (RDO)* optical technology for measuring dissolved oxygen in the most demanding process environments. The RDO technology, which has been approved by the U.S. Environmental Protection Agency (EPA), uses the dynamic luminescence quenching technique. Comprised of a sensor and multi-channel transmitter, it works on the frequency domain method and provides the highest levels of stability and accuracy for dissolved oxygen measurement.


The patented signal processing within the sensor enables it to respond to changes in process conditions up to fi ve times faster than other optical systems, allowing maximum process savings through improved control.


The robust design of the sensor enables it to withstand the problems that can affect conventional membrane-based sensors, such as abrasion, fouling or poisoning. Constructed from inert, non-corrosive materials, it is suitable for use in high salinity environments. The sensor lumiphore is not affected by photobleaching or stray light. The sensor itself is also immune to the effects of sulfi des, sulfates, hydrogen sulphide, carbon dioxide, ammonia, pH, chloride and other interferences that can affect membrane-based sensors.


The use of the dynamic luminescence quenching principle means that the sensor is not susceptible to drift, removing the need for frequent maintenance. A key benefi t of the system is its simplicity. ABB’s EZLink plug and play technology automatically connects the transmitter and sensor, with no need for wiring or complicated confi guration. Set-up is straightforward, with a user friendly HMI and clear menus making it easy to set parameters and view diagnostic information.


Available in two or four channel versions, the Aztec AWT440 universal transmitter can be connected to up to four ABB digital sensors, enabling monitoring at multiple points without purchasing and installing separate transmitters.


This simplicity also extends to the sensor itself, which features a smart sensing cap with automatic setup. The SmartCap comes pre-loaded with factory calibration coeffi cients, serial number, lifetime indication, and manufacture date which are automatically uploaded to the sensor, eliminating the time normally required for set-up. By automatically prompting the user when replacement is due, the SmartCap also removes the risk of unexpected sensor failure.


The SmartCap is capable of up to 24 months of continuous operation, greatly reducing the requirement for maintenance. When the cap does need replacing, it will be as easy as the original installation – the calibration details will be pre-loaded and the transmitter will automatically recognise the new sensor.


When cleaning is necessary, it can be cleaned and redeployed without calibration, saving time and cost and eliminating disruption to measurement. For high-fouling applications, the sensor can be automatically cleaned using ABB’s auto-cleaning system. This system periodically injects a high pressure burst of air across the sensor surface to remove any fouling.


All measured data is stored in the AWT440 transmitter’s internal memory, together with event log and confi guration data. In total, up to 300 days’ worth of process data can be stored, in addition to the last 10 data log and event log fi les and eight confi guration fi les within its internal memory. The transmitter’s event log fi les contain audit log, alarm log, diagnostic log and calibration log data that is time and date stamped, providing the operator with full audit trail capability.


Various options are available for remotely accessing data held within the transmitter. An Ethernet option enables measurement readings and active diagnostics data to be accessed via a PC. Profi bus DP V1.0 or Modbus RS485 communications provide the added choice of accessing data via a distributed control network. The inclusion of SD and USB portals also enables users to securely store data on portable devices for transfer to a PC for analysis using ABB’s DataManager Pro data review software.


With a range of installation options, the ABB optical dissolved oxygen system can be used in a wide variety of applications, from large-scale municipal and industrial waste water treatment plants through to food and beverage production processes. Options include dip mount systems, fl oating ball systems and chain mount immersion systems for open tank and channel installations, as well as a fl ow-through system for panel mount systems.


Distribution Deal for Oil in Water Analyser


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Quantitech, the Milton Keynes based instrumentation specialist, has been reappointed by Spectro Scientifi c as exclusive distributor in the UK and Ireland for a portable infrared analyser, the InfraCal 2. Based on the original highly popular InfraCal, (formerly manufactured by Wilks Enterprise who were purchased by Spectro in 2013) the latest version offers a host of new features such as multiple calibrations, lower detection limits, faster analysis, data logging and a new touch screen with security features.


Providing easy, reliable, measurements in typically less than one minute, the InfraCal 2 is a rugged analytical instrument with a very low maintenance requirement. As a result, it has become standard test equipment in applications such as produced water monitoring at offshore installations and on-board ships. It is also used for applications such as sub-ppm detection of fats, TPH or oil in water, monitoring cleaning effi ciency of metal parts, measuring barrier layers in fl exible fi lms, textiles and fi bre fi nishes, research and quality control.


The ability to produce accurate readings in the fi eld offers users a number of important benefi ts including faster results, lower cost per test and avoidance of the problems associated with the preservation of samples during transport.


Quantitech’s Dominic Duggan says: “We have been providing this technology and its precedents for over 30 years, so we have a good understanding of the applications for which it is ideal and we are delighted to be reappointed as Distributor.”


Environment Agency Awards German Flowmeter Manufacturer


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The NivuFlow range of fl ow meters utilise cross correlation technology to detect real time velocity profi les and then combine these with water depth and cross sectional area measurements to compute accurate volumetric fl ow rates. The fully integrated PCM 4 fl ow meters are also ideal for temporary fl ow measurements when a mains power and communications infrastructure are not available on site.


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The framework will operate for an initial 2 years from October 2015 to October 2017, with the option to extend by two further 12 month periods up to a maximum of 4 years.


The principle aims of the Environment Agency and associated partners are to protect and improve the environment and to promote sustainable development. The respective hydrometry teams who have awarded this framework are responsible for assessing the quantity of water in the environment. This includes rivers and streams, groundwater aquifers and lakes where Hydro-acoustic instrumentation is widely used to fulfi ll this requirement.


IET January / February 2016 www.envirotech-online.com


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The Environment Agency in partnership with the Scottish Environmental Protection Agency and Natural Resources Wales have recently awarded NIVUS GmbH the Echo Correlation lots for ‘Bed Mounted’ and ‘Fully Integrated’ portable fl ow measurement instruments as part of their new Hydro Acoustic Framework.


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