Ultrasonic Flow Meters

20+ Years Manufacturing Experience

Struggling to Measure Sludge and Sewage Flow? Get to Know Lanry DF6100 Doppler Ultrasonic Flow Meter


Key Highlights of DF6100 Series Doppler Ultrasonic Flowmeter

01. Pipe Size Range

It is suitable for pipe sizes ranging from 40 to 4000mm.

02. Required Medium

For dirty liquids, a certain amount of air bubbles or suspended solids shall be contained.

03. Wide Flow Rate Range

Excellent low flow rate measurement ability, low to 0.05m/s. A wide range of flow measurement, high flow rate can reach 12m/s.

04. High Temperature Measurement

High-temperature transducer is suitable to liquids of -35°C - 200°C.

05. Outputs

4-20mA, Relay and OCT outputs.

06. Accuracy

Accuracy: 2.0% calibrated span.

1.DF6100 Series Doppler Ultrasonic Flow Meter — Product Portfolio Summary

Accurate flow measurement of liquids containing suspended solids, sediments or micro‑bubbles has long been a technical challenge for water‑related industries. Traditional flowmeters often suffer from clogging, wear, frequent maintenance or even invalid readings when handling wastewater, sewage and industrial process media with impurities. Lanry DF6100 series is a complete family of Doppler‑based ultrasonic flow meters independently developed by Lanry Instruments. The product range covers three configurations: DF6100‑EC wall‑mount clamp‑on type, DF6100‑EI insertion type, and DF6100‑EP portable type, satisfying diverse on‑site measurement requirements.

DF6100 series is designed for full‑pipe liquid measurement. Most installation scenarios do not require pipe cutting, system shutdown or pipeline modification. It supports both permanent online monitoring and temporary on‑site spot checks, delivering stable flow data for process control, water‑balance analysis and wastewater discharge compliance supervision.

2. What is the working principle of the DF6100 series?

Ultrasonic Doppler effect

Lanry DF6100 series works based on the ultrasonic Doppler effect. Each system consists of two core components: transmitter and ultrasonic transducer. The transmitting transducer emits high‑frequency ultrasonic waves into the measured liquid. Suspended particles, sediment or tiny air bubbles carried by flowing fluid reflect ultrasonic echoes back to the receiving transducer.

Since reflective particles move together with the liquid flow, the frequency of returned ultrasonic signal generates offset, defined as Doppler frequency shift. The value of frequency shift is directly proportional to fluid velocity. The built‑in high‑speed microprocessor captures this shift data. Combined with pre‑configured pipe parameters such as inner diameter, pipe material and wall thickness, the transmitter calculates real‑time flow velocity, instantaneous volumetric flow rate, and accumulates total flow volume automatically.

For DF6100‑EC wall‑mount clamp‑on version, transducers are externally fitted onto pipe outer wall without medium contact. DF6100‑EI insertion transducer can be mounted through pipe wall under running condition without system shutdown. DF6100‑EP portable unit allows quick deployment for short‑term site auditing and commissioning. It is worth noting that Doppler measurement needs a certain concentration of reflectors within liquid. Ultra‑clean fluid without particles or bubbles cannot produce valid echo signals for DF6100. For such applications, transit‑time ultrasonic flowmeters shall be the proper alternative.

3. What Are the Key Features of the DF6100 series Doppler Flowmeter?

Non‑stop installation There is no requirement to stop pumps, drain pipelines or interrupt production, which greatly reduces site construction costs and production‑loss risks.
Wide measuring range Velocity range covers 0‑12 m/s, adaptable for both low‑flow and high‑flow conditions. Typical onsite accuracy reaches 0.5 ~ 2 % Full Scale for most industrial applications.
Strong anti‑interference capability Adaptive signal gain algorithm is embedded to suppress electromagnetic noise generated by frequency converters and other field equipment. Stable readings can be obtained under harsh industrial environments. It fits carbon steel, stainless steel, PVC, HDPE and other common pipe materials.
Three modular variants wall-mounted,Insertion and portable.
Low‑maintenance design DF6100‑EC clamp‑on has no wetted moving parts and avoids sensor clogging. Routine work mainly includes regular inspection of transducer fastening status, lowering long‑term operation expenditure.
User‑friendly operation Menu‑driven keypad for local configuration. Operators only need to input basic pipe dimension parameters to finish setup, without complex on‑site calibration. Built‑in EEPROM memory preserves historical data and total flow even during power failure, preventing data loss.
Many outputs can be optional 4-20mA, OCT, Relay and so on.

4. How to Operate and Commission DF6100 Correctly On‑Site?

Before commissioning DF6100 series, collect critical site parameters: pipe inner diameter, wall thickness, pipe material, medium property and medium temperature. For DF6100‑EC clamp‑on installation, select qualified straight‑pipe segments and ensure sufficient upstream and downstream straight runs to mitigate turbulence influence. Clean pipe outer surface at transducer mounting positions, apply acoustic coupling gel and fix sensors tightly according to installation instructions.

Power on the transmitter and enter parameter configuration menu. Input pipe dimensions, material and medium information. The instrument automatically calculates measuring coefficients. Run the transducer signal‑test function to verify echo‑signal strength; qualified signal intensity guarantees reliable measurement results. After configuration is completed, switch to measurement page and read real‑time velocity, instantaneous flow and totalized flow from local LCD screen.

For DF6100‑EP portable model, assemble transducers and cables inside the carrying case before site work. After spot measurement is finished, flow logs can be manually recorded or exported via communication port. During daily operation, monitor signal strength periodically. If signal level drops remarkably, check transducer position, coupling condition or heavy pipe scaling. Avoid installing transducers close to elbows, valves, pumps and reducers which generate turbulent flow field. Do not exert excessive mechanical stress on transducer cables. Cumulative flow data will be safely stored inside memory in case of power interruption; manual backup is unnecessary.

 

5. How to Choose the Right DF6100 Model for Your Project?

  1. Selecting the correct DF6100 variant depends on installation condition, measurement purpose and pipe specification.

    • DF6100‑EC wall‑mounted clamp‑on: Recommended for permanent online monitoring on existing pipelines where process shutdown is not allowed. It fits most standard metal and plastic pipes with moderate wall thickness.
    • DF6100‑EI insertion type: Preferred for thick‑wall pipes, large‑diameter pipelines or heavily coated pipes where external clamp‑on signal is weak. The insertion transducer penetrates the pipe wall and receives echo directly from inside the fluid.
    • DF6100‑EP portable: Ideal for temporary site surveys, commissioning verification, energy audits and multi‑point inspection across different pipelines. It comes with a carrying case and rechargeable battery for field mobility.

    Before placing an order, users should provide pipe outer diameter, wall thickness, pipe material, medium type, medium temperature and required output signals. Lanry technical team will recommend the most suitable configuration accordingly.

6. How to Maintain DF6100 for Long‑Term Stability?

DF6100 series is designed for low maintenance, but periodic checks will extend service life and preserve measurement accuracy.

Monthly checks:

  • Verify instantaneous flow reading against process expectation.
  • Check signal strength and signal quality on the transmitter display.
  • Inspect transducer cable connections for looseness or water ingress.

Quarterly checks:

  • For clamp‑on type: re‑apply coupling gel if signal drops; re‑tighten mounting straps.
  • For insertion type: inspect sensor tip for scaling or bio‑fouling; clean gently if needed.
  • Check enclosure sealing and cable gland tightness, especially in outdoor or humid environments.

Annual checks:

  • Compare DF6100 reading with a reference flow meter or calibrated portable device.
  • Inspect transmitter power supply and grounding condition.
  • Back up configuration parameters in case of transmitter replacement.

No moving parts and no wetted components (for clamp‑on variant) mean there is no wear‑and‑tear calibration required. As long as signal strength remains healthy, the meter will maintain its original accuracy for years.

 

7. The Application of DF6100 Series Doppler Flowmeter

Lanry DF6100 Doppler ultrasonic flow meters apply to full‑pipe liquid measurement with suspended particles or micro‑bubbles.

Wastewater & Sewage Treatment Plants: Inlet and outlet pipeline flow monitoring, activated sludge pipeline measurement, sewage discharge statistics for internal water‑balance management.

Industrial Manufacturing: Chemical plant effluent discharge, pulp‑containing wastewater from paper mills, food‑processing wastewater, mineral‑particle‑laden process water. DF6100 helps avoid frequent clogging failures common for traditional intrusive sensors.

Municipal Water Utilities: Wastewater pumping‑station monitoring, centralized effluent supervision for industrial parks, compliance measurement for enterprise sewage discharge for environmental‑protection authorities.

Mining & Metallurgy: Tailings‑carrying process water and slurry pipeline flow monitoring, well‑adapted for particle‑rich media.

Project Commissioning & Auditing: DF6100‑EP portable version is widely adopted by EPC firms and engineering consultants for temporary spot flow check, pipeline commissioning validation and water‑balance site survey without permanent instrument installation.

DF6100 series is compatible with mainstream global PLC and RTU hardware. With CE certification, it has been exported to Southeast Asia, Middle East, Africa and Latin America, supporting system integrators, contractors and local distributors for water‑related projects.

 

FAQ About the DF6100 Series Doppler Flowmeter

Q1. Can DF6100 measure clean tap water without suspended particles?

No. DF6100 adopts Doppler principle which relies on particles or micro‑bubbles for ultrasonic reflection. For clean water with few reflectors, please select Lanry transit‑time ultrasonic flow meter instead.

Q2. Is pipe cutting required for DF6100‑EC wall‑mount clamp‑on installation?

Not required. Transducers are externally mounted on pipe outer wall. No pipe cutting or process shutdown is needed, ideal for retrofitting existing pipelines.

Q3. Which factors will affect DF6100 on‑site measuring accuracy?

Insufficient upstream/downstream straight pipe sections, heavy pipe scaling, poor transducer coupling, excessive air bubbles or large debris near measuring points will impact accuracy. Strictly follow installation manual for optimal performance.

Q4. Can DF6100‑EP portable unit be used for open‑channel flow measurement?

No. DF6100 series is designed for closed full‑pipe flow measurement. For open‑channel and partially‑filled‑pipe conditions, please refer to Lanry DOF6000 open‑channel flow meter series.

Q5. What minimum particle concentration is required for reliable Doppler measurement?

The liquid should contain at least 50 mg/L of suspended solids or micro‑bubbles. Too few reflective particles will result in weak echo signals and unstable readings. Please consult Lanry technical support if you are unsure about your medium composition.

1
Arina Hu | Sales Engineer

Graduating with a Bachelor’s in Business English, as a sales engineer of Lanry Instruments more than 5 years.

Having participated in multiple overseas exhibitions,possess in-depth product knowledge of our complete instrument lineup

and strong capabilities for international client engagement.Should you have any project demands for instruments, pls feel free to contact me.

Post time: Sep-08-2026

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