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Contactless Water Flow Meter for External Open Channel Urban Sewage Infrastructure
Quick Answer: Contactless water flow meters for open channels measure sewage flow from above the water surface. Radar or ultrasonic sensors do not touch the water, so sludge, rags, and grit do not foul them. Silver Instruments supplies IP68 open channel flow meters with 4-20 mA HART, Modbus RTU, and pulse output for urban sewage networks.
Urban sewage infrastructure includes open channels, culverts, and partially filled pipes. Flow measurement at these points often fails because of debris, sludge, and high humidity. A contactless water flow meter solves this by mounting above the channel. No sensor sits in the flow stream. No moving parts wear out.
Where These Meters Are Used
We have supplied open channel flow meters for sewage pump stations, treatment plant inlets, combined sewer overflows, and industrial effluent channels. The meter measures level and velocity. It then calculates flow based on channel geometry. Typical update time is 5 to 15 seconds.
A water utility in Vietnam uses a Silver Instruments radar flow meter on a 1.2 m wide concrete channel at a treatment plant inlet. The sensor sits 0.4 m above maximum water level. It sends 4-20 mA HART to the plant SCADA.
A contractor in the Philippines installed a non-contact ultrasonic flow meter on a 1.8 m wide rectangular culvert. The meter runs on 24 V DC and gives Modbus RTU data to a remote terminal unit. No air purge system is needed. That is the benefit of contactless sensing.
Radar vs Ultrasonic for Sewage
For urban sewage, radar is preferred when foam, steam, or rapid temperature changes are present. Radar works at 80 GHz in most Silver Instruments models. It ignores surface foam and thin oil films. Ultrasonic costs less and works on short straight channels with stable air temperature. But ultrasonic signals drift when air temperature changes fast. We often recommend radar for sewerage because humidity and hydrogen sulfide are present.
Ultrasonic still works on some treated effluent channels. Most engineers skip ultrasonic on raw sewage with rags, scum, and floating solids. Radar needs a clear line of sight but does not need a stilling well.
Key Technical Parameters
Silver Instruments contactless open channel flow meters cover channel widths from 0.2 m to 30 m. Standard radar level range is 0.1 m to 20 m. Flow velocity range is 0.05 m/s to 15 m/s. Accuracy is ±2 percent of reading for flow when channel dimensions are entered correctly. Sensor housing is IP68. Operating temperature is -20 °C to 60 °C. Outputs include 4-20 mA HART, Modbus RTU, RS485, and pulse. Power supply is 24 V DC or 85 to 265 V AC.
These numbers are not theoretical. Each meter is configured for the actual channel profile. The flow algorithm includes a velocity coefficient. For rectangular channels, the coefficient is usually 0.85 to 0.95. For trapezoidal channels, it changes with depth. Customers sometimes use default coefficients and report errors of 8 to 12 percent. Do not skip field calibration. Send channel drawings and the manufacturer can set the coefficient before shipping.
Installation Notes
Mount the sensor on a rigid bracket or gantry above the channel. The dead zone is typically 0.3 m below the sensor face. Keep the sensor 0.3 to 0.5 m above the highest water level. Avoid mounting directly above heavy turbulence or hydraulic jumps. For coastal sites in the Middle East or Southeast Asia, use the IP68 sensor version because humidity and salt spray are high.
At pump station discharge channels, install the sensor 5 to 10 times the channel width downstream of the last bend or gate. If the channel
How to Size and Select
You need four pieces of information. First, the channel shape and dimensions. Second, the minimum and maximum flow range in m³/h or L/s. Third, power supply and output signal available. Fourth, local installation conditions such as direct sunlight, flooding, and access for maintenance.
Send us your channel width, flow range, power supply, and output signal. We will recommend a Silver Instruments model and provide a quote within one working day.
Typical Configuration
A common order for an urban sewage channel looks like this. Silver Instruments OCF-100 radar open channel flow meter, 0 to 5 m level range, 0.05 to 10 m/s velocity range, 24 V DC power supply, 4-20 mA HART and Modbus RTU outputs, IP68 sensor, 10 m cable. The transmitter is mounted in a fiberglass enclosure at the channel side. Price depends on cable length and whether a local display is needed.
For small channels below 0.5 m width, a compact ultrasonic model may be enough. For channels with foam, oily films, or rapid level changes, use the radar version. The cost difference is small compared to the cost of failed measurement.
Why Buy from Silver Automation Instruments
We are a flow meter manufacturer and supplier with customers in Southeast Asia, Australia, Latin America, Africa, and the Middle East. We sell direct to end users and to distributors. Our technicians configure each open channel flow meter before shipping. We provide English manuals, wiring diagrams, and remote commissioning support.
Our product range includes electromagnetic flow meters, Coriolis mass flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, thermal mass flow meters, pressure transmitters, and paperless recorders.
FAQ: Contactless Open Channel Sewage Flow Meters
Can a contactless flow meter measure raw sewage with rags and solids?
Yes. Radar and ultrasonic sensors measure from above the water surface. They do not touch the sewage. Rags and sludge do not foul the sensor if it is mounted outside the splash zone.
What is the minimum channel width for contactless flow measurement?
Silver Instruments supplies models for channel widths from 0.2 m upward. Below 0.2 m, a flume or weir with a pressure transmitter may be more practical.
Which output signal is best for sewage pump stations?
4-20 mA HART is common because it connects directly to PLC and SCADA systems. Modbus RTU over RS485 works well for remote telemetry units. Pulse output is useful for totalizing flow.
How do you calibrate an open channel flow meter without stopping the flow?
Enter the channel dimensions and flow coefficient in the transmitter menu. If possible, take a velocity profile reading with a portable current meter and adjust the coefficient. We can set the coefficient before shipping if you provide the channel drawing.
Do you ship to Southeast Asia, Australia, and the Middle East?
Yes. We ship to Vietnam, Thailand, Indonesia, Philippines, Malaysia, Australia, Saudi Arabia, UAE, Nigeria, Mexico, Chile, and other countries. Standard models ship in 5 to 10 working days.
Need a quote for a contactless water flow meter in an open sewage channel? Send us the channel width, flow range, power supply, and output signal. We will reply with a model and price.
Contact Silver Automation Instruments at +86-25-68650347 or WhatsApp +86-25-52155837. WeChat ID is +86 15365082610.
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