Water/Wastewater 11 Optical Dissolved Oxygen Sensor for Water Quality Management
This innovative solution for optical dissolved oxygen measurement is designed by Sentronic (Germany) for harsh and demanding environmental conditions with non-corroding POM and with threads for easy mounting of various accessories. Based on the optical principle of fluorescence quenching, SentrOxy WQM dissolved oxygen sensors combine high measurement performance with low maintenance and operating costs. With its focus on aquaculture management, SentrOxy WQM is ready for implementation in water treatment plants, sea and land based fish farming, open-pen production facilities,
recirculation systems, hatchery operations, etc.
The precise sensor optics allow the implementation of two separate optical measurement channels which take measurements in different areas of the same sensitive sensor spot. This innovative and patented principle allows for real-time referencing. This makes your measurement much more reliable and informs you about mechanical defects of the membrane or measurement falsification.
The solid oxygen sensitive sensor spot contains no fragile membranes or electrolyte and is part of a robust replaceable cap. Only having to replace or clean the sensitive measuring cap from time to time minimises service time and costs. Each sensor is furnished with pre-loaded calibration coefficients.
An additional transmitter is not necessary. The sensors can be connected directly to a process control system by using the digital RS485 interface with Modbus RTU protocol, or the two 4 (0) – 20 mA analogue outputs including a watchdog function and different alarm levels. A trigger input makes a simple adjustment possible by connect this appropriate wire to the ground.
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26815pr@reply-direct.com Non-Contacting Control for the Mersey Estuary Pollution Alleviation Scheme
Pulsar Process Measurement (UK) have supplied non-contacting ultrasonic level measurement instruments that have been incorporated into United Utilities flagship project, the Mersey Estuary Pollution Alleviation Scheme (MEPAS), providing key control and monitoring functions throughout the network of CSO/SSO chambers, vortex and interceptor sewers that form the MEPAS network.
When the major Sandon Dock Wastewater Treatment Works was expanded during the 1990’s, the scheme included a substantial network of interceptor sewers and CSO, designed both to separate out solids and particulates before the main Works and to manage storm surges. Some of Pulsar’s earliest equipment was used as the project went live, including the unit that bears the serial number 0001. The Mersey is now so clean that, within a few hundred yards of the sewage treatment works itself, a scuba diving centre is flourishing, and many species of fish have re-established themselves in the river.
However, following major and damaging floods in 2010, it became clear that the existing control and monitoring regime that controlled the flow to the WwTWwas not operating as it should. The new control systems contractor, Ramptec, along with UU’s modelling team, redesigned the system operation through the 39 CSO’s within the network. Pulsar Process Measurement supported, ensuring that the ultrasonic level measurement instruments at each location were performing correctly.
Under the new control arrangement, the holding capacity of the system is maximised, so storm flows to the works are better managed, discharges of untreated and semi-treated sewage to the Mersey are minimised, and limits are in place and controlled accurately to avoid any risk of further flooding arising from overflow of the system. Each CSO includes three or more Pulsar units, at measurement points to maintain control and flows – within the chamber, at the outfall end, measuring river levels and within the vortex chamber feeding on to the wastewater treatment works. Some of the applications were challenging, including measurement down narrow pipes that was previously undertaken using pressure transmitters. Pulsar remained involved throughout the project to re-establish control, providing service and commissioning support to Ramptec.
As Ray Watts of Ramptec put it: ‘We have a very good relationship with Pulsar. The fact that we have their first unit, dating back to 1997, and also some of their latest equipment, proves that they supply good equipment and are able to back it up effectively’
The sternest test of the operation of the new system came in September 2012. The 25th September saw some of the worst storms on record, and the effluent height in the culvert reached 4.5m AOD (metres above ordinance datum), a volume of water that would have potentially resulted in devastating flooding if it had not been properly controlled. Both the control system and the CSO’s worked perfectly, however, releasing the excess water safely away from habitation.
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26532pr@reply-direct.com Refrigerated Sampler the Answer to the Rigorous Demands of Water Monitoring
Teledyne Isco (USA) introduces the 5800 Refrigerated Sampler as the answer to the rigorous demands of water monitoring. This new sampler features easy control and on-site programmability, as well as a unique slide-out bottle rack that eliminates awkward stooping and bending when retrieving sample containers. With these features, the 5800 Refrigerated Sampler is the only choice for stationary sampling in both municipal and industrial wastewater applications.
"Our new refrigerated sampler was designed by our customers through their feedback on what they wanted and needed in a sampler,” said Angel Luke, Sampler Product Marketing Manager for Teledyne Isco. "The 5800 incorporates what we have learned from, as well as built upon, proven Isco technology to produce a high quality and reliable refrigerated sampler.”
Some of the 5800
Refrigerated Sampler's unique features include: Flashing display to quickly identify program exceptions or alarm conditions; Up to four user- programmable, easy-recall sampling routines for weekday, weekend, high flow and low flow operation; Pause and Resume program option to synchronise your sampling with plant operations; Program Auto Re-Run option to automatically restart your sampling routines; Summary reports of sampler events and refrigerator temperature data for viewing and download.
The 5800 Refrigerated Sampler is just one of Teledyne Isco’s many products that are available for your application. With its ease of use, on-site abilities, and sample volume accuracy, this refrigerated sampler has it all. To learn more about this and other sampling products, please contact them for more information 800-228-4373 or
www.isco.com.
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www.envirotech-online.com IET September / October 2013
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