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Long lasting, cost-effective solutions for water-related applications, integrating our customers’ know-how with KELLER’s H2O-expertise.
Sewage i overflows are a big problem because they pollute the environment. In the example below you’ll learn how KELLER Netherlands successfully uses the DCX22AA datalogger i together with the KELLER "Logger" Software to solve the sewage overflow problem.
Sewage overflow occurs when more rain falls than the sewers can process. If there was no management facility in place, manhole covers would be launched into the air due to the enormous pressure, which builds up over a very short period by the large amounts of rainwater accumulating in the sewer.
In order to counteract this tendency, the sewage system has walls built in in several places. On the other side of the wall there is a river or a canal. When necessary the surplus of water flows over the wall into the natural water.
Of course this should only be an option in cases of emergency. Therefore, the local governments are forced by the national government to register the number of overflows and the total quantity of water, which is dumped into natural waterways. The KELLER "Logger" Software calculates the total volume of overflow, while the DCX22AA measures the water levels. It is achieved as follows:
Three trigger levels, by which the datalogger increases the logging speed, can be programmed in the "Logger" Software.
Trigger i 1 is used to activate expedited logging
Trigger 2 to switch it back to normal logging speed and
Trigger 3 to calculate flow and overflow quantities.
The following graph makes it easier to understand.
The report created by the KELLER software is used to report the number of overflows and the volume of waste water dumped into a “Waterschap“ i , which is a state-owned institute responsible for water management in Holland. If overflows occur too often, the National Government can force a local Government to build a waste water buffer - a large circular concrete tank with a capacity of thousands of m3s.
In this buffer the surplus waste water is buffered and when possible pumped to the waste water cleaning location.
Waste water cleaning facilities.
Since 2007 KELLER Poland has installed more than 5000 pieces of Series 46 X transmitters in waste water applications. The transmitters are mostly used in newly built or upgraded lift stations.
The 46 X level transmitters serve as a main sensor for waste water level monitoring, whereas the floating switches are used as a secondary control element. The main advantage of the 46 X is a chemically resistant AL2O3 diaphragm with gold layer, which is also more immune against mechanical damage when compared to the thin steel diaphragm used in piezoresistive transmitters. Another huge advantage are the modern digital electronics, which allow many users to take advantage of MODBUS i communication, as well as a freely scalable 4…20mA output. The outstanding reliability of the 46 X in this extremely tough application deserves to be mentioned too.
In wastewater measurement, accurate readings are essential to ensure proper pump operation. Failures in this area result in unhygienic liquid waste overflow i and costly repairs to pump mechanisms.
With 36 XKY KELLER level transmitters pump failures due to grease accumulation as well as the use of bulky protective cages belong to the past. The solution combines the non-stick quality of Teflon with superior toughness and a resistance to abrasion.
Switching from float devices to a modern solution with the 26 Y KELLER Level Transmitter provides a continuous measuring system to control wastewater levels.
The customer needed a wastewater level measurement system, which was initially solved with floating switches. Switch one would cause the tank to fill when the level dropped to a minimum, switch two would stop filling the tank at maximum level, whereas switch three acted as an alarm not to refill the tank.
Instead of using several floating devices, the company opted for the 26 Y KELLER Level Transmitter.
The main advantages of hydrostatic measurement compared to float switches in an application with wastewaters are:
Example of Wastewater Capacity with Level Measuring Systems