When the treatment plant of Spring Township, PA needed reliable open channel flow measurement, they turned to Flowline. As wastewater transfers through the plant, its passes through several weir monitoring stations. The facility was using submersible pressure sensors that suffered from two problems. First, during the extreme winter cold, the sensors became erratic when the water temperature approached freezing. Second, the sensors required ongoing maintenance as silt would clog the diaphragm ports over time. For this reason, Flowline suggested the use of our guided wave sensors that are temperature stable and unaffected by material build up. The result is reliable open channel flow measurement. Here, an EchoWave guided wave radar level transmitter is bracket mounted to an arm suspended over the weir.