The Precise Cornerstone of Digital Hydrological Monitoring: Nexisense Radar Flow Velocity Meter and Open Channel Flowmeter

In the flow monitoring of urban drainage pipe networks, natural river channels and industrial sewage outlets, complex medium composition and fluctuating flow patterns often cause traditional instruments to fail frequently. Nexisense intelligent radar open channel flowmeter, with its non-contact measurement technology and deep algorithm optimization, provides excellent stability and measurement accuracy for flow monitoring under harsh working conditions.

Core Selling Points

• Non-Contact Dual-Radar Sensing: Integrates radar flow velocity meter and radar level gauge without contacting the fluid, completely eliminating sensor material hanging, scaling and corrosion problems, significantly reducing operation and maintenance costs.

• High-Precision Digital Flow Velocity Model: Collects surface flow velocity and automatically converts it into average cross-section flow velocity through built-in physical models. Flow velocity resolution reaches 0.01m/s. With correction coefficients, it ensures metering accuracy under complex working conditions.

• Powerful Industrial Integration and Cloud Interconnection: Standard MODBUS-RTU RS485 protocol, supports 4G/WIFI/LORA expansion and programming customization. Data can be directly uploaded to the cloud to achieve remote digital control.

• Digital Window for Precise Decision-Making

  

Product Overview

Nexisense digital radar open channel flowmeter is a precision instrument specially designed for non-full-pipe, open channel and complex container fluid monitoring. It synchronously obtains the surface flow velocity and real-time water level of the fluid through non-contact means using millimeter-wave radar technology.

The core competitiveness of the equipment lies in its intelligent data processing hub: it not only measures physical quantities, but also combines preset cross-section information (such as cross-sectional area, slope, etc.) and dynamic correction coefficients, and outputs the flow result in real time according to the formula Q = V_avg × A × K (where Q = flow rate, V_avg = average cross-section velocity, A = wetted cross-sectional area, K = correction coefficient).. This fully digital algorithm coupling enables Nexisense to show extremely high response speed and anti-interference ability when facing dynamic fluids.

Core Technical Advantages

1. Excellent Anti-Interference Stability and Physical Structure
      Nexisense adopts a non-contact design. The instrument is installed above the liquid surface and is not affected by weeds, floating objects or chemically corrosive media in the water. The flow velocity meter is only affected by dynamic targets. This means that even if the radar beam illuminates the hardened channel side walls, it will not produce flow measurement deviation, greatly enhancing the tolerance of the installation environment.

2. High-Precision Sensing and Multi-Parameter Coupling
      Flow velocity sensing: Range covers 0.1-20m/s, capable of sensitively capturing low flow velocity and ultra-high flow velocity states.
      Liquid level ranging: Ranging range up to 0.5-45 meters, accuracy controlled within 10mm, meeting various ranging needs from deep wells to wide river channels.
      Temperature compensation: Built-in high-precision temperature sensor supports ultra-wide working temperature range from -40℃ to 85℃, ensuring physical model stability under drastic temperature changes.

3. Digital Integration and Protocol Details
      Nexisense strictly complies with industrial-grade communication specifications, providing RS485 digital signal output. The communication protocol follows the standard MODBUS-RTU (1 start bit, 8 data bits, 1 stop bit). Users can read all parameters including water level, flow velocity, instantaneous flow, cumulative flow and temperature through function code 03H, and can even set core parameters such as cross-sectional area through 03H/06H function codes, achieving a high degree of programmable customization.

4. Intelligent Interaction and Remote Operation and Maintenance
      The system is equipped with a 7-inch full-color touchscreen display box, adopting a double-door rainproof structure design, convenient for quick on-site operation. At the same time, the device has waterproof aviation plug connections and the ability to upload data directly to the cloud. Integrators can obtain flow information in real time from the remote monitoring end, greatly shortening emergency response time.

   
   

Key Technical Specifications

Core Application Scenarios

1. Urban Drainage and Pipe Network Monitoring: Monitoring non-full-pipe sewage pipelines in cities. The non-contact design effectively avoids the risk of oil and debris blocking the sensor.

2. Natural River Channels and Flood Prevention Early Warning: Installed in large rivers and channels. The large-range water level measurement (45m) and flow velocity monitoring provide core data for flood prevention and disaster reduction.

3. Sponge City Construction: Real-time flow monitoring for seepage and drainage pipe trenches, supporting data direct connection to the cloud, assisting the smart city brain in water resource scheduling.

4. Industrial Wastewater Treatment and Sewage Monitoring: High-precision flow statistics at sewage outlets in chemical and metallurgical industries, resistant to extreme medium temperature and corrosion.

Installation Guidelines and Wiring Suggestions

To ensure the long-term stability of the Nexisense measurement system, the installation process should strictly follow the following technical specifications:

• Obstacle Avoidance Principle: When installing the flowmeter, there shall be no obstructions in the irradiation range of the water level meter and flow velocity meter radar, otherwise it will cause beam scattering and affect measurement accuracy.

• Leveling and Centering: When installing the flowmeter, try to ensure that the upper surface of the shell is horizontal and install it in the middle position of the channel or pipeline.

• Direction Guidance: The flow velocity meter beam is recommended to face the incoming water direction (horizontal angle with the water flow direction is 0 degrees) to obtain the strongest Doppler frequency shift signal.

• Electrical Specifications: Use the standard waterproof aviation plug for connection. When performing RS485 networking, please ensure the correct access of the 120 ohm matching resistor to prevent signal reflection interference.

Frequently Asked Questions (FAQ)

Q1. What are the advantages of Nexisense radar flowmeter compared with ultrasonic open channel flowmeter?

Nexisense adopts millimeter-wave radar technology and is not interfered by air temperature and humidity, dust and medium volatile gases. At the same time, the non-contact characteristics of the radar flow velocity meter avoid the hanging material and freezing problems often encountered by ultrasonic probes, and the stability is higher.

Q2. Will the reflection of the channel wall affect the measurement accuracy?

No. Nexisense algorithm is only sensitive to dynamic targets. As long as the channel is hardened and there are no weeds or trees swaying with the water flow, even if the radar beam hits the side walls, it will not produce flow measurement error.

Q3. How does the system cope with still water surface or ultra-low flow velocity (below 0.1m/s)?

When the flow velocity is lower than 0.1m/s, the signal-to-noise ratio of the radar signal will decrease. The system supports programmable settings. Users can set the low flow velocity cut-off value according to actual working conditions, or optimize the performance of the low-speed section through correction coefficients.

Q4. Is the instrument's communication protocol compatible with mainstream PLC or DCS?

Completely compatible. Nexisense strictly complies with the standard MODBUS-RTU protocol. The baud rate (default 9600) and register address definitions are clear. Users can directly extract data through the standard 03H instruction.

Q5. How does this non-contact instrument measure the cross-sectional area?

The area is not directly measured, but is automatically calculated by the internal model using the real-time water level measured by the radar combined with the cross-section geometric parameters (such as pipe diameter, channel width, etc.) input by the user in the system settings.

Q6. Will the touchscreen fail in extreme low temperature environment (such as -30℃)?

The Nexisense display system design takes extreme temperature range into consideration, but in extremely cold conditions, the liquid crystal response may be slightly delayed. Since the data supports RS485 and 4G remote transmission, the core monitoring task will not be limited by on-site screen interaction.

Q7. Why is “correction coefficient” needed in the measurement formula?

Because the radar measures surface flow velocity, while flow calculation requires average cross-section flow velocity. The correction coefficient (calculated from the standard value measured in the actual environment) is used to compensate for the deviation caused by uneven flow velocity distribution and riverbed roughness, thereby ensuring the scientific nature of the metering.

Q8. What is the usual maintenance cycle of the equipment?

Thanks to the non-contact and no moving parts design, the Nexisense sensor end almost does not require daily maintenance. Only regularly check whether the radar wave-transparent window is severely blocked by mud according to the degree of environmental pollution.

Q9. Does the equipment have lightning protection and anti-surge capability?

The system has industrial-grade electrical protection mechanisms. Combined with IP65 protection level, it can effectively cope with induced lightning interference caused by harsh outdoor weather.

Summary and Engineering Integration Support

Nexisense digital radar open channel flowmeter is not only a collector of physical variables, but also the basic asset for realizing industrial digital twins and smart water affairs. With its non-contact high reliability, millisecond-level digital response and deep cloud integration capabilities, it transforms complex fluid metering into transparent and reliable data streams, helping engineering integrators achieve excellent delivery goals in every water conservancy project.

Your project is facing liquid level or flow measurement challenges in harsh environments?
Please contact Nexisense senior application engineers immediately. We can provide you with customized cross-section correction algorithm models and RS485/cloud networking solution consultation to help you take the lead in digital water upgrade.