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FEATURE FLOW & LEVEL CONTROL TAKE REMOTE CONTROL WITH ‘PLUG AND PLAY’


A mass flow controller from Bürkert is helping control CO2 gas, which in turn maintains the target pH in remote water treatment works


D


elivering high quality water supplies to remote communities can be a


considerable challenge for water authorities, but a combination of expert engineering skills and innovative process control equipment has delivered a solution. Ross-shire Engineering (RSE) is using mass flow controllers from Bürkert to ensure pH levels are maintained at optimum levels. Water treatment processes are used to


remove impurities, both biological and chemical, as well as balance pH levels. In most installations, on-site staff can monitor and maintain the equipment to ensure continuous operation. However, in remote locations, regular on-site interventions are not practicable, so reliability has to be built-in to the equipment. RSE designs, fabricates and delivers


innovative modular water treatment plants to supply high quality water to remote communities. Using processes


responsibility of the local water authority to deliver these standards. Significant geographical areas within the UK experience high pH levels within their surface water, due to organic matter within the soil, so there is a need for a simple and reliable control process. RSE uses carbon


dioxide (CO2) to reduce the pH of the water to increase the mineral content through reaction with limestone/ remineralisation media. Primarily, it is a gas that is easy to handle, non-corrosive, and its most appealing feature is that it will not lower the pH of water below 4.0. In addition, the only maintenance required


a mass flow controller (MFC) supplied by Bürkert. A Bürkert Type 8711 MFC is used in


each application. In contrast to a simple flow control device, the measurement is independent of pressure and temperature, making it more accurate in varying conditions. When used with CO2, the Type 8711 has a nominal flow range, from 0.02 LN/min up to 40 LN/min. The MFC is calibrated by Bürkert for the


The Type 8711 mass flow controller from Bürkert


‘The Bürkert mass flow controller is central to maintaining the correct pH and it is delivered as a ‘plug & play’ component, which minimises installation time’


such as reverse osmosis, Nanofiltration and Ultrafiltration, and automated process control equipment, the company develops and delivers robust and reliable water treatment plants for their clients. Water quality is determined by


standards and specifications and it is the


for the dosing system is to replenish the gas cylinders periodically. The design and parameter settings for


the pH control process are determined by the local water authority. On each site the process control loop consists of a pH sensor, some solenoid control valves and


Transportable water treatment units offer a compact solution for remote locations (top) (Source: Ross Shire Engineering)


GAUGING APPLE PUREE LEVELS QUICKLY AND ACCURATELY


The demand for high quality food products, and efficiency in supply, means the food manufacturing industry requires high quality production and management systems. Food processing companies are now calling for scientifically and mathematically accurate, ergonomic, innovative, technology which is designed to improve maintenance and safety management systems. A leading food factory in Slovakia, which processes fresh fruit, vegetables and meat is one of


these companies. They were faced with a problem in the production of apple puree, to be used in baby and toddler food and juice products. The apple puree is stored in large steel tanks, at 4.5m in height, however the factory had no way to check the liquid level of apple puree inside the large tanks, which was affecting their efficiency. Keen to find a solution, the company contacted Coltraco Ultrasonics. A site


visit was conducted by Lubomir Ernst, the Central & Eastern European regional director of Coltraco Ultrasonics, and after a short trial, he was could see that the existing liquid level indication technology employed on the Portalevel MAX INDUSTRIAL was efficient in quickly and accurately gauging the liquid level of apple puree within the vessel. The implementation of the Portalevel MAX INDUSTRIAL will


allow the plant to run more efficiently and reduces risks by providing the staff with a means of accurately and non- invasively monitoring the contents within the apple puree tank. Coltraco Ultrasonics


8 MAY 2019 | PROCESS & CONTROL


gas being controlled before it is delivered to the customer. For those involved in more complicated applications, the Type 8711 can be set up to measure two different gases. In this application, the changeover


solenoid valves control the CO2 bottle banks to provide a duty/standby changeover system. The CO2 gas flowrate is accurately adjusted to control the target pH of the water treatment works using Bürkert’s Type 8711 MFC. Craig Kerr, sales manager for Bürkert,


explained: “Bürkert has been chosen to supply these components because of their easy integration, accuracy and reliability. Operating in such remote locations and providing such a vital service, means that the equipment must be reliable above all else. To date, of the units installed on RSE Water treatment sites, there have been no failures, ensuring that the residents continue to receive high quality water supplies. RSE propose to use this system on six future water


treatment projects in 2019." Paul McCloskey, senior technical


manager at RSE, concluded: “We design these compact treatment plants for optimum performance with minimal maintenance. The Bürkert mass flow controller is central to maintaining the correct pH and it is delivered as a ‘plug & play’ component, which minimises our installation and configuration time.”


www.coltraco.com


Bürkert Fluid Control Systems www.burkert.co.uk


/ PROCESS&CONTROL


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