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NIVELCO CASE STUDIES Effluent Flow Measurement for dual v-notch weir The City of Lebanon is located in Southwest Ohio and serves a population of just over 20,000 residents. The Water and Wastewater Division provides Sewer Collection and Treat- ment for the city and surrounding communities. Thanks to the Aqua Technology Group, they are now equipped with reliability and accuracy of NIVELCO instruments. Wastewater treatment plant effluent flow measurement is a common application that can be accurately measured with the NIVELCO ultrasonic level transmitters. However, this application was different in that it had two v-notch weirs in parallel to handle the flow requirements. Ultrasonic Flow and Level Transmitter The wastewater operations for the City of Leba- non, Ohio had an existing flow meter that had failed after just two years of operation. Opera- tions also reported that the flow meter on the effluent never matched what they were receiv- ing on the input. The operators found that the ultrasonic level sensor of the 2 part Magnetrol/ STI flow meter was not staying level and be- coming prone to failures. They needed a reli- able way to measure flow going across both v-notch weirs and add flow pacing to the other process controls. V-Notch Weir Flow Measurement Therefore, in the field of public utilities new EasyTREK ultrasonic level transmitters with the MultiCONT universal display and controller was provided for the flow meter and level measure- ment. The IP68 rated EasyTREK SPA-38N-4 integrated ultrasonic level transmitters are installed to a console above the basin. The units use HART digital communication to connect in multidrop loop to the MultiCONT multi- channel process controller. The MultiCONT is able to provide remote programming and display measurement results. The specialist of Aqua Technology Group adjust the instrument’s calibration to read the flow across both v-notch weirs and send the data back to the central SCADA system along with using the additional output of the MultiCONT to flow pace UV disinfection and their effluent wastewater sampler. The complete measuring system proved to be an excellent solution, since it performs highly reliable operation, and high accuracy measure- ment solution. Dave Miller Managing Director NIVELCO USA LLC [email protected] Open-channel flow measurements with EasyTREK – USA
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