HIGH-PERFORMANCE MEASUREMENT TECHNOLOGY IN THE WATER INDUSTRY
Ensuring good water quality, monitoring and regulating water levels, checking pressure conditions in water pipelines, and measuring the fi ll levels in tanks – measurement technology plays a major role in the water industry. With its extensive expertise and many years of experience, KELLER AG für Druckmesstechnik is able to offer a wide range of pressure sensors for water-industry applications.
Nothing runs without water! After all, water isn’t just one of the great elements; it’s also vital for our survival. Water is both a foodstuff and a necessary part of the process for growing food and maintaining livestock. Water also keeps industry moving as a coolant, a means of transport and a component of power generation processes. In other words, without water, our economy would come to a virtual standstill.
Water should therefore be viewed as essential and irreplaceable. Water is not available in unlimited supply, which is why we are all obligated to use it effi ciently and carefully – and not just because of economic interests. Reliable and accurate measurement technology is extremely important here, and KELLER AG für Druckmesstechnik has been doing its part by ensuring reliable pressure measurement in the water industry for more than 45 years now. This is accomplished by the use of level sensors, data loggers, remote transmitters and display units that monitor water supply systems, sewage systems, groundwater levels and surface water. This brochure offers an in-depth look at cost-effective solutions for water applications that are based on the extensive H2
O expertise at KELLER and the knowledge accumulated by customers over many years.
A non-fouling solution to avoid pump failures resulting from grease accumulation
In wastewater measurement, accurate readings are essential to ensure proper pump operation. If such a measurement system fails, unhygienic wastewater can overfl ow and pollute the environment. The pump systems themselves can also suffer damage if operated incorrectly on the basis of erroneous measurement values. Among other things, wastewater contains organic compounds such as proteins, carbohydrates and fats (grease). The latter in particular have the unpleasant habit of clumping together and forming sediments that are diffi cult to dislodge.
False measurements due to the formation of sediments
Newport News, Virginia in the USA offers a good example of what can happen in such a situation. Newport News was founded in 1621. It is situated along the James River and its nearly 180,000 residents make it the fi fth largest city in Virginia. Here, several restaurants were built in an area serviced by the same municipal wastewater lift station. The high grease content in the wastewater then polluted the existing level measurement equipment, ultimately leading it to break down completely.
Antiquated solutions
Prior to the development of the commercial district, the Newport News Waterworks and the Hampton Roads Sanitation District relied on a combination of mechanical fl oats and conventional submersible transmitters. Both measurement systems stopped working after the restaurants opened: Both the primary and redundant level measurement equipment failed to properly transmit level data to the pump controller.
Large amounts of grease from restaurant chains put a strain on sewage systems (Barry Blackburn /
Shutterstock.com)
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The heightened grease content in the wastewater caused by the restaurants led clumps to form on the level transmitter
Wastewater treatment plant in Newport News
membranes, which ultimately blocked the fl ow of water to the measuring membrane. On the redundant fl oat switch, whose purpose was to trigger the pump in the event of a failed level transmitter, the accumulation of grease blocked the mechanical operation of the fl oat ball. The failure of the level transmitter and the backup system led to the failure of the entire lift station because the pumps either operated constantly or not at all. If technicians hadn’t acted quickly, the entire sewage system could have come to a complete standstill.
Kynar® membrane offers better resistance
If a lift station is to function properly, grease must not be allowed to block the measuring devices. Various manufacturers offer non-fouling products that often present diffi culties in other areas, however. The instruments usually employ a Tefl on-coated elastomer membrane, which, while non-fouling, is also relatively weak and prone to puncture.
The membrane is therefore equipped with a rather bulky protective
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