Monitoring Fluid Levels in Sewers and Clarifiers

Level Measurement Solutions for the Water and Waste Water Industry

As water and waste water treatment plants grow in size and complexity, so does the need for control equipment that will handle the operations of the plant.

Furthermore, there is a growing need to maintain a higher level of environmental control and supervision by both municipalities and governmental organizations.

Operation managers and maintenance engineers working in water and waste water sites are seeking instant results and a high level of accuracy in managing sludge, clarifiers and open

channels.

Ultrasonic technology is considered the traditional non contact method of level measurement in the water and wastewater industries treatment. The non contact measurement requires low maintenance, hence offering a long lasting and cost effective solution.

Solidat's line of ultrasonic non-contact transducers is tailored to meet these demands, providing solutions for various applications in water and waste water sites. These solutions are fast and easy to install and deliver continuous and accurate level and open channel flow readings.

 

  

 

 

Preventing Overflow Saving Costs

Waste-water conveyed from the city's sewers runs through a series of pipes entering the waste-water treatment plant. The pre-treatment stage includes streaming of the waste water through open channels equipped with various types of filters to screen large solids from the water and which are then poured into settling tanks before proceeding to the clarifiers. After separating the liquid from the sludge, the water is streamed through channels to the clarifiers. Accurate measurement of the water level in the clarifier's tanks is essential for the plant to control and obtain the process intact.

Once the sludge enters the clarifiers there is a need to maintain a close watch on the water level

in the tanks in order to control the process and prevent the addition of too much oxygen into the sludge which may cause a low level of bacteria to develop in the aeration tanks.

 

Sewer cement pools are usually installed underground,3-12 meters deep and contain pipes, pumps and other obstacles that can cause acoustic noises. The environment inside the pool is highly corrosive and often contains gas and foam. In rainy weather or in strong sludge streams, the surface of the fluids inside the pools may alter rapidly, causing the surface level of the fluid to rise above a certain limit. As mentioned, the pools contain pumps for emptying the contents of

the pool. A rise in the surface of the fluid will activate the first pump, to relieve the overflow in the pool. If the fluid level continues to rise, a second pump will start working to supplement the first. If these two cannot cope with the flow, an overflow alarm will be activated.

Wastewater treatment plant operators use equipment to remove harmful industrial and domestic pollution from wastewater. Waste materials are transported by water through sewer pipes to treatment plants. Together with engineers, scientists and technicians treatment operators are responsible for meeting federal and state water quality standards. Efforts to ensure clean water supplies through federal regulations have increased demands to develop "high tech" systems for treatment plants.

 

SmartScan50L The ideal solution

The SmartScan 50L can scan and memorize different types of interference signals, thereby overcoming obstacles such as ladders, pipes and pumps that might impede accurate level readings.By virtue of its sealed IP67 sensor the SmartScan is protected in the event of water overflow in the pool.

The SmartScan 50L is the ideal solution for non-contacting measurement of water level in sewers pools. It delivers accurate data while automatically compensating for changes in temperature and other environmental conditions such as: corrosive environment, methane (CH4) gas, foam, and solids in sludge.

The SmartScan 50L includes two components: electronics and transducer, thereby enabling the transducer and electronics to be located separately – the transducer inside the sewer, with the electronics in a control room or above the pool.

 

The SmartScan 50L carries a highly sensitive 50KHz transducer made of glass-reinforced epoxy, designed to cope with harsh environments containing gas and foam. The SmartScan 50L has a measuring range of up to 12 meters (39 ft.), and can detect changes in fluid level in real time.

The data then generated on the 4-20mA current enables operators to control the fluid level in the sewer and prevent it from overflowing. The SmartScan 50L has 5 independent SPDT relays that can control the pumps in the pool and any other alerting device.

Features & Benefits：

1、4-Wire

2、4-20mA

3、RS232/RS485 communication

4、5 independent SPDT relays for pump and alarm control (on/off programming)

5、50 KHz sensor

6、Accuracy of 0.2% of measuring range

7、Resolution: 1 mm (0.04 inch)

8、Sensor's operating temp': -40°C to 90°C

(-40°F to 194°F)

9、Graphic LCD display

10、Mounting options: 1"NPT/1"BSP

11、Wall mount/Panel mount