After passing sump pits, household wastewater is sometimes transferred to a vacuum sewerage systems, which acts as an intermediary station between households and wastewater plants. Continuous measurement is needed in these tanks to ensure accurate vacuum- and sewer pump control. Once the sewage reaches a predetermined level, sewage pumps will initiate operation and transfer the sewage to wastewater plants. The vacuum pumps cycle on and off to maintain vacuum in the tank throughout this process.
The Rosemount 3490 Series provide comprehensive control functionality for 4–20 mA or HART compatible transmitters, such as the Rosemount 1208 Level and Flow Transmitter. The series consist of two models that offer varying levels of control functionality depening on your specific application needs. The Rosemount 3490 Controller enables simple programming through intuative wizards for level and flow measurement to control pumps, totalize flows, log data and calculate differentials. The controller is easy-to-read and has a colored LCD display that offers a simple, intuitive and an user-centric interface.