Level Measurement in Sewage Pools

The USonic system is perfectly suited for the prevention of wastewater overflow in sewers. To provide a practical example of the instrument’s applicability, it is possible to explore the case of a major powerplant that is well known for its ‘Green Approach’ and its commitment to maintaining a clean, safe environment both within the plant itself and in its surrounding area.

The Problems

The plant’s branched sewage system needs instantaneous control and maintenance, and water utilized by the plant to operate the turbine and other wastes is pumped into the city’s wastewater treatment plant via the sewage system.

Some of the sewers are spread around the plant in somewhat remote locations, meaning that accessing them to repair damages on time can be problematic.

Technicians at the plant had been searching for a solution to improve control of the sewers, thus preventing cases where there might be an overflow of wastewater.

Because the sewage system is connected to a central control room, readings from each sewage pool had to be relayed to the primary DCS. The plant required an on-site guard and 24 hour watch over these sewers in order to ensure maximum control.

The technicians also highlighted an issue when the sewers were blocked, stating that because it took time and required specific equipment to address the blockage, wastewater flooding was inevitable. This flooding causes severe damage to its surroundings, so the prevention of this was deemed essential.

The Solution

Following exploration of a range of possible solutions, the plant decided to install two USonic systems within its sewage pools. Because USonic can produce continuous, accurate non-contact readings of the water in the pools, the plant’s engineers were provided with a clear picture of their status on an ongoing basis.

The USonic’s integral construction and compact size makes its installation quick and simple, allowing it to be an effective solution in a range of settings. It possesses a measuring range of up to 30 feet, and in this instance the USonic had no issues providing water level readings of the 12 foot high sewage pools. Its Scan Distance function was able to map obstacles in the pool while memorizing interfering signals.

Within the plant, the USonic was connected via 4-20 mA to the central control system, allowing the plant’s engineers to maintain constant control over the level of the water in the sewers. The engineers were able to make sure that the sewers maintained the correct level of water at all times, with the reassurance that they would be alerted should an emergency situation arise.


By using two USonic systems, engineers in the example power plant were afforded complete control over the water level in the sewers. The system can show continuous level readings at all times, revolutionizing the way that maintenance personnel were able to manage the sewage system.

They are now able to detect sudden blockages and prevent environmental damage quickly, while the USonic’s compact size and competitive price offered the plant an immediate return on investment.

This information has been sourced, reviewed and adapted from materials provided by Drexelbrook.

For more information on this source, please visit Drexelbrook.


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