DF6100-EC Wall Mounted Clamp-On Flowmeter for Dirty Liquids
Reliable non-invasive flow measurement for wastewater, sewage and slurries. No pipe cutting. No process shutdown. Clamp it on and measure.
As flow metering of dirty liquids — with suspended solids, sludge and bubbles — grows, conventional meters often fail to deliver stable readings. The DF6100-EC wall-mounted clamp-on Doppler ultrasonic flow meter solves this with the Doppler principle, relying on particles and bubbles to reflect the signal, and clamp-on non-intrusive installation — no pipe cutting, no process shutdown. This guide covers its principle, core features, applications, installation, specifications, how it compares with inline meters and FAQs.
1. What Is a Clamp-On Flowmeter for Dirty Liquids?
Measuring the flow of dirty liquids can be challenging when the fluid contains suspended solids, air bubbles, sewage, sludge or other impurities. Conventional flowmeters may require pipe cutting, process shutdown or direct contact with the liquid.
The Lanry DF6100-EC wall-mounted clamp-on Doppler ultrasonic flowmeter provides a non-invasive solution for measuring flow in full pipes containing dirty or aerated liquids. By using the Doppler ultrasonic principle, it detects ultrasonic reflections from suspended particles or air bubbles moving with the liquid — particularly suitable for wastewater, sewage, sludge, industrial process liquids and other liquids containing sufficient suspended solids or bubbles.
A clamp-on flowmeter is installed externally on the pipe rather than being inserted into or directly contacting the liquid. For dirty liquids, a Doppler ultrasonic flowmeter works by transmitting ultrasonic signals through the pipe wall into the liquid. Suspended particles or air bubbles reflect the signal back to the transducer. The frequency shift of the reflected signal is used to determine the flow velocity and calculate the flow rate. This makes Doppler ultrasonic flowmeters suitable where the liquid contains enough suspended particles or bubbles to provide ultrasonic reflectors.
The DF6100-EC is designed for applications such as:
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• Wastewater flow measurement
• Sewage flow measurement • Raw water flow measurement • Sludge and slurry measurement |
• Industrial wastewater
• Drainage water • Process liquids containing suspended solids • Liquids containing air bubbles |
2. Why Use a Doppler Flowmeter for Dirty Liquids?
The main advantage of the Doppler principle is that it uses particles or bubbles naturally present in the liquid as ultrasonic reflectors. For example, wastewater may contain suspended solids, sludge particles and air bubbles. When these particles move with the liquid, the reflected ultrasonic frequency changes. The DF6100-EC analyzes this frequency shift to determine the liquid velocity.
This makes a Doppler flowmeter particularly useful for dirty water and wastewater flow measurement. However, the liquid must contain a sufficient amount of suspended solids or bubbles. Very clean water without adequate ultrasonic reflectors is generally better measured using a transit-time ultrasonic flowmeter.
3. What Are the Key Features of the DF6100-EC?
Key features:
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Wall-mounted flow transmitter — Fixed wall-mounted transmitter for continuous flow monitoring. Can be integrated into industrial monitoring systems for long-term flow measurement.
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Clamp-on non-invasive installation — Transducers are mounted externally on the pipe — no pipe cutting, no direct sensor contact. Can often be installed while the pipeline remains in operation.
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Suitable for large pipe sizes — Designed for pipe sizes from approximately DN40 to DN4000, from industrial pipelines to large wastewater and water treatment pipelines.
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Wide flow velocity range — Measures from approximately 0.05 m/s to 12 m/s, providing flexibility for different wastewater and industrial flow conditions, including low-flow applications.
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Multiple output options — Depending on the selected configuration, outputs include 4–20 mA, Relay and OCT, allowing connection with external monitoring, control or data acquisition systems.
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4. Where can DF6100-EC be applied?
The DF6100-EC can be used in many applications involving dirty, aerated or particle-containing liquids.
5. What Are the Installation Considerations for Dirty Liquid Flow Measurement?
Although clamp-on installation is convenient, correct sensor positioning is important for reliable measurement.
6. How Does the DF6100-EC Compare with Inline Flowmeters?
One reason customers consider a clamp-on Doppler flowmeter is to avoid modifying an existing pipeline.
For an existing wastewater pipeline where pipe modification is undesirable, clamp-on ultrasonic measurement can therefore be a practical alternative.
7. How to Select a Flowmeter for Dirty Liquids?
When selecting a flowmeter for dirty liquid measurement, do not look only at the pipe diameter. The following information is important:
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1. Liquid type
2. Suspended solids or particle concentration 3. Air bubble content 4. Pipe diameter 5. Pipe material 6. Pipe wall thickness |
7. Liquid temperature
8. Flow velocity 9. Whether the pipe is always full 10. Available installation location 11. Required output signal |
Providing these parameters to the flowmeter manufacturer can help determine whether a Doppler ultrasonic flowmeter, transit-time ultrasonic flowmeter, electromagnetic flowmeter or another technology is appropriate.
The Lanry DF6100-EC wall-mounted clamp-on Doppler ultrasonic flowmeter is designed for non-invasive flow measurement in full pipelines containing dirty, aerated or particle-containing liquids. With external clamp-on installation, a wide pipe size range, low-flow measurement capability and multiple output options, it can be considered for wastewater, sewage, sludge, slurry, drainage and industrial wastewater applications.
FAQ
What type of liquid can the DF6100-EC measure?
The DF6100-EC is designed for liquids containing sufficient suspended solids or air bubbles, such as wastewater, sewage, sludge and certain industrial process liquids.
Can the DF6100-EC measure clean water?
The Doppler principle requires ultrasonic reflectors in the liquid. If clean water contains insufficient suspended particles or bubbles, a transit-time ultrasonic flowmeter may be more appropriate.
Does the pipe need to be full?
Yes. The DF6100-EC is designed for full-pipe flow measurement. For partially filled pipes or open channels, a dedicated open-channel or partially-filled pipe flowmeter should be considered.
Does the pipe need to be cut?
No. The transducers are installed externally on the pipe using the clamp-on method.
Can it measure wastewater?
Yes. Wastewater is one of the typical applications, provided that the wastewater contains sufficient suspended solids or air bubbles for Doppler measurement.
Can it measure sludge or slurry?
It can be suitable for certain sludge and slurry applications, but the actual liquid composition, particle concentration, pipe material and pipe condition should be evaluated before selection.
Tell us your pipe — we'll evaluate the application
If you are looking for a clamp-on flowmeter for dirty liquids, send us your pipe diameter, pipe material, liquid type, temperature and approximate flow velocity. Lanry can help evaluate the application and recommend a suitable configuration.
With extensive hands-on project experience, I have supported installations and commissioning in a wide range of real-world applications, focusing on practical solutions that work reliably in the field. Feel free to contact my WhatsApp.
Post time: Sep-29-2026