Key Highlights of the DOF6000 Series
01. Multi-Parameter Measurement
Measures water velocity, depth and conductivity simultaneously, while the calculator can determine flow rate and total flow.
02. Designed for Challenging Flow Conditions
Suitable for open channels, partially filled pipes, rivers, streams, culverts and irrigation channels.
03. Flexible Installation Options
Available in wall-mounted and portable configurations for permanent monitoring or temporary field measurement.
04. Bi-Directional Velocity Measurement
Measures both forward and reverse flow, making it suitable for applications where flow direction may change.
05. IP68 Submersible Sensor
The epoxy-sealed Ultraflow QSD 6537 sensor is designed for underwater installation in demanding environments.
06. Easy System Integration
RS485/MODBUS communication allows connection with computers, PLC, SCADA and other monitoring systems.
2. How Does the DOF6000 Series Calculate Flow in Different Flow Conditions?
Conventional flow meters are often designed around full and regular pipes. Real-world water systems, however, are not always full, uniform or geometrically regular.
The DOF6000 Series can calculate the cross-sectional area of partially filled pipes, open channels, streams and rivers.
For rivers and streams, up to 20 coordinate points can be used to describe the shape of the cross section.
Area-Velocity Measurement Approach
By combining water velocity and water depth measurements with cross-sectional geometry, the DOF6000 Series can determine the effective flow area and calculate flow rate under changing water-level conditions.
This capability is particularly useful where the flow path is irregular or where water levels change continuously.
3. What Are the Key Features of the DOF6000 Series Flow Meter?
| Cross-Section Description | Up to 20 coordinate points can be used to describe river cross-sectional shape. |
|---|---|
| Multi-Parameter Measurement | Measures velocity, depth and conductivity simultaneously. |
| Velocity Range | 0.02 mm/s to 12 m/s, with bi-directional measurement. |
| Velocity Accuracy | 1% accuracy. |
| Flow Direction Measurement | Measures both forward flow and back flow. |
| Depth Range | 0 to 10 m. |
| Depth Measurement | Pressure sensor and ultrasonic level sensor principles. |
| Barometric Pressure Compensation | Equipped with barometric pressure compensation. |
| Sensor Protection | IP68 epoxy-sealed sensor body. |
| Communication | RS485/MODBUS output for connection to computers and monitoring systems. |
4. How Does the DOF6000 Series Measure Flow Using the Ultrasonic Doppler Principle?
The DOF6000 Series uses the Ultrasonic Doppler Principle in Quadrature Sampling Mode to measure water velocity.
The Ultraflow QSD 6537 sensor transmits ultrasonic energy through its epoxy casing into the water.
Suspended sediment particles or small gas bubbles in the water reflect part of the transmitted ultrasonic energy back toward the sensor. The received signal is then processed to determine water velocity.
This principle is particularly useful for natural and industrial water applications where suspended particles or small bubbles are present.
The sensor also supports measurement in both forward and reverse directions, which helps monitor applications where flow direction can change.
5. How to Install the DOF6000 Series Sensor
The DOF6000 Series includes two configurations: the DOF6000-W wall-mounted unit for permanent monitoring and the DOF6000-P portable unit for temporary field surveys.
Both configurations work with the IP68-sealed Ultraflow QSD 6537 submersible multi-parameter sensor.
Recommended Sensor Installation
- Install the sensor on the invert bottom of pipes, culverts or open-channel beds.
- Select a straight flow section whenever possible.
- A minimum upstream straight run of 5× pipe diameter is recommended for partially filled pipe applications.
- Avoid bends, joints and highly disturbed flow sections.
- Keep the sensor approximately parallel to the water surface, within ±10°, to support accurate depth measurement.
- Use stainless-steel expanding band kits for suitable pipe installations or metal brackets for river and channel installation.
- Prevent sediment and silt from covering the sensor measuring faces during long-term operation.
Installation of the Calculator
The DOF6000-W wall-mounted calculator should be installed indoors or under suitable shelter and protected from direct sunlight and heavy vibration.
The DOF6000-P portable calculator is supplied with a protective ABS hard case and built-in rechargeable battery, supporting up to 50 hours of field operation.
Standard sensor cable length is 15 m, with optional cable lengths available up to 500 m.
6. Communication and Output Options
The DOF6000 Series provides multiple signal and data output options for integration with PLC, SCADA, remote monitoring platforms and local data storage systems.
The system can provide real-time velocity, water depth, conductivity, instantaneous flow rate and accumulated total flow data.
| Signal Type | Main Function | Key Parameters |
|---|---|---|
| RS485 MODBUS RTU | Remote data reading and partial parameter configuration | 4800–115200 bps; configurable slave address and parity |
| 4–20 mA | Analog output for real-time flow and water depth | Separate channels for flow and depth signal transmission |
| Pulse Output | Totalized flow pulse counting | Cumulative flow volume statistics |
| SD Card Data Logger | Local CSV data storage | 16 GB onboard storage; logging interval from 5 s to 100 h |
| GPRS Optional | Remote data transmission | Suitable for projects without permanent remote transmission infrastructure |
7. What Applications Is the DOF6000 Series Suitable For?
Because of its area-velocity measurement approach, multi-parameter sensing and flexible installation options, the DOF6000 Series can be applied to a wide range of open-flow and partially filled-flow monitoring projects.
Partially Filled Pipes
Suitable for municipal and industrial pipelines where the pipe is not consistently full.
Culverts
Suitable for buried cross-drainage systems associated with highways and railways.
Open Channels
Supports rectangular, trapezoidal and U-shaped channels used for irrigation and drainage.
Rivers and Streams
Suitable for hydrological surveys, flood warning, water-resource monitoring and ecological projects.
Irrigation Systems
Helps monitor water flow for farmland, orchards, greenhouses and irrigation management.
Environmental Monitoring
Provides long-term flow data for environmental assessments, water management and restoration projects.
Industrial Wastewater
Supports flow monitoring for wastewater and waste-liquid management applications.
8. What Makes the DOF6000 Series a Reliable Solution for Diverse Flow Monitoring Applications?
The DOF6000 Series combines the Ultraflow QSD 6537 sensor with wall-mounted or portable calculators to provide a flexible approach to open and semi-closed flow measurement.
Instead of requiring a conventional full-pipe measuring section, the system can work with partially filled pipes, open channels, rivers and other irregular flow environments.
One System for Multiple Measurement Requirements
- Water velocity measurement
- Water depth measurement
- Conductivity measurement
- Flow rate calculation
- Total flow calculation
- Bi-directional velocity measurement
- Flexible cross-sectional configuration
- RS485/MODBUS system integration
Whether the requirement is permanent monitoring or temporary field measurement, the DOF6000 Series provides a practical solution for professionals working with changing water levels, irregular flow paths and partially filled systems.
FAQ About the DOF6000 Series Flow Meter
Q1. Does the DOF6000 work with clean water?
The DOF6000 uses the ultrasonic Doppler principle to measure water velocity. Its operation depends on suspended particles or small gas bubbles in the water to reflect the ultrasonic signal back to the sensor. Therefore, it is generally more suitable for water containing suspended solids or bubbles.
Q2. What parameters can the DOF6000 Series measure?
The DOF6000 Series can simultaneously measure water velocity, depth and conductivity. When used with the DOF6000 Flow Calculator, it can also calculate flow rate and total flow.
Q3. What is the difference between the DOF6000-W and DOF6000-P?
The DOF6000-W is a wall-mounted model designed for fixed, long-term flow monitoring. The DOF6000-P is a portable model designed for temporary measurements, field surveys and on-site flow testing.
Q4. How does the DOF6000 Series measure water velocity?
The DOF6000 Series uses the Ultrasonic Doppler Principle in Quadrature Sampling Mode. Suspended particles or small gas bubbles reflect ultrasonic signals back to the sensor, allowing the instrument to calculate water velocity.
Q5. Can the DOF6000 Series measure flow in both directions?
Yes. The DOF6000 Series supports bi-directional velocity measurement and can measure both forward flow and back flow.
Daniel Chen | Technical Support Engineer
As a Technical Support Engineer at Lanry Instruments, Daniel Chen has more than 10 years of hands-on experience in the flow meter industry, covering technical consultation, field application analysis and customized solution support for the company’s flow meter product range.
Post time: Sep-02-2026