Nexisense Radar Level Meter: Non-Contact Level Measurement Installation and Integration Solution

Nexisense Radar Level Meter: Non-Contact Level Measurement Installation and Integration Solution

Nexisense radar level meter adopts FMCW or pulse radar technology to achieve non-contact continuous measurement of liquid, solid powder, and slurry surfaces through narrow beam microwave pulses. This series of products takes high signal-to-noise ratio echo processing and advanced anti-interference algorithms as the core. It has been widely used in petrochemical storage tank areas, sewage treatment regulating pools, pharmaceutical reaction kettles, food raw and auxiliary material storage tanks, coal chemical slurry tanks, and other scenarios. It supports various industrial communication protocols such as 4-20mA+HART, RS485 Modbus RTU, and PROFIBUS PA, and can seamlessly access existing DCS, PLC, and industrial IoT platforms, providing stable and reliable level data for process control systems.

Core Principles and Key Precautions for Radar Level Meter Installation

The measurement accuracy and long-term stability of the radar level meter highly depend on the selection of installation position and antenna arrangement. If the microwave beam encounters fixed interference objects (such as agitator blades, feed pipes, tank wall protrusions, steps, adhesions) or areas with severe liquid level fluctuations during propagation, false echoes will be generated, leading to signal distortion or loss.

Installation Position Selection Specifications

• The antenna axis must be strictly perpendicular to the measured medium surface to ensure the maximum intensity of the reflected wave returns to the receiver.

• It is recommended to install at a position more than 300 mm away from the tank wall to avoid false echoes formed by multiple reflections from the tank wall.

• For circular or elliptical containers, installation at the exact center of the top is strictly prohibited. It should be offset from the center by about 1/2R (R is the container radius) to prevent reflected waves from converging at the center of the tank top and forming strong interference.

• Priority should be given to avoiding feed inlets, discharge areas, agitators, heating pipes, areas with severe liquid level fluctuations, and areas with thick foam layers.

• For storage tanks with large liquid level fluctuations, it is recommended to use bypass pipe (stilling well) installation or guided wave radar solutions to stabilize the measurement interface.

Antenna Extension and Nozzle Requirements

• Horn Antenna Type: The horn mouth should extend at least 10 mm beyond the inner surface of the installation flange to avoid diffraction interference from the flange edge.

• Rod/Rod Antenna: The antenna must fully extend out of the installation hole, and the installation short pipe length ≤100 mm.

• The length of the shielding tube (stilling tube) should be ≥ the nozzle diameter to ensure the beam is not affected by the pipe mouth edge.

  
  

Special Working Condition Response

• High Viscosity, Easy Crystallization, Easy Wall Hanging Media: Prefer PTFE or ceramic antennas, combined with regular cleaning or steam tracing.

• Strong Foam, Strong Steam Environment: Select high-frequency (80 GHz) narrow beam models or add foam suppression measures.

• Strong Agitation Tanks: Recommend bypass pipe installation or guided wave radar.

Typical Application Scenarios and Project Cases

Petrochemical Storage Tank Area

In large dome tanks or internal floating roof tanks for crude oil, diesel, residue oil, etc., Nexisense 80 GHz radar level meters are deployed at eccentric positions on the tank top, integrated with HART protocol into the enterprise SCADA system to achieve real-time inventory monitoring and high/low level alarm linkage. In a storage tank group project of a refining and chemical enterprise, more than 120 units were installed. The level measurement repeatability is better than ±2 mm, significantly reducing the frequency of manual gauging and safety risks.

Sewage Treatment Regulating Pool and Aeration Pool

The regulating pool has large level fluctuations and much surface foam. Nexisense uses 26 GHz radar level meters installed with bypass pipes to stably track level changes and link with lift pumps and aeration fan control. In a municipal sewage treatment plant project, 80 units were deployed. After integration with the PLC system, the level control accuracy was improved to ±10 mm, reducing overflow accident hazards annually.

Pharmaceutical and Food Reaction Kettles

Agitation is severe inside the reaction kettle, and the medium is easy to hang on the wall. Nexisense selects PTFE antenna radar level meters installed at eccentric positions on the top. Data is uploaded to the batch management system via Modbus TCP to achieve precise control of feeding volume. After application on a production line of a large API enterprise, the batch density and level correlation deviation is controlled within ±0.5%, improving product yield.

Selection Guide

Frequency Selection: 80 GHz high-frequency narrow beam is suitable for small tanks and strong interference environments; 26 GHz/6 GHz is suitable for large tanks and long-distance measurement.

Antenna Type: Horn antenna is suitable for atmospheric large tanks; rod/cable type is suitable for guided wave requirements; PTFE/ceramic antenna is used for corrosive or hygienic-grade media.

Range and Accuracy: Conventional 0-30 m, accuracy ±2 mm; special requirements can choose ±1 mm high-precision models.

Output and Communication: Basic type 4-20mA+HART for traditional control systems; intelligent type adds RS485 Modbus RTU or PROFIBUS PA, supporting remote parameter configuration and diagnosis.

Protection and Certification: IP67/IP68 protection, Ex d IIC T6 Gb explosion-proof certification is suitable for hazardous areas.

Integration and Installation Precautions

Before installation, confirm that the tank top flange specification matches the antenna, and the verticality error ≤1°; perform empty tank calibration and full tank verification before commissioning, and set the false echo suppression area (false echo mapping). System integration recommends using HART protocol for remote range adjustment and fault diagnosis, or Modbus RTU for multi-instrument bus connection. It is recommended to set multi-level level alarms (high-high, high, low, low-low) and link with pump and valve interlocks. Regularly check antenna cleanliness and signal quality, and perform on-site verification every 6-12 months.

OEM Customization and Bulk Supply Advantages

Nexisense supports OEM private label production and can customize antenna material, range interval, flange standard, communication protocol fields, and display interface language according to project requirements. Bulk supply provides tiered pricing, long-term supply agreements, development of dedicated installation brackets/protective covers, and on-site debugging training. The delivery package includes complete installation manuals, calibration certificates, communication protocol documents, and SDK examples to help system integrators quickly respond to bidding projects in chemical, environmental protection, pharmaceutical, food, and other industries.

FAQ

1. Why does installing a radar level meter at the center of a circular tank top lead to inaccurate measurement?
Multiple reflected waves from the tank wall converge at the center to form strong false echoes, interfering with the real liquid surface signal and causing the displayed value to jump or lock to an incorrect value.

2. What effects will occur if the horn antenna does not extend more than 10 mm beyond the inner surface of the flange?
Diffraction interference and standing wave effects are generated at the flange edge, causing near-distance false echoes and affecting low level measurement accuracy.

3. Why is bypass pipe installation recommended for storage tanks with severe level fluctuations?
The bypass pipe (stilling well) can effectively isolate level fluctuations, foam, and vortices, stabilize the measurement interface, and improve signal reliability.

4. How to avoid interference when agitator blades appear within the radar level meter beam range?
Preferably install away from the agitator position, or set a false echo suppression area; in case of severe interference, switch to guided wave radar or bypass pipe solution.

5. What is the difference in applicable scenarios between HART and Modbus RTU during system integration?
HART is suitable for point-to-point remote parameter configuration and diagnosis; Modbus RTU is suitable for economical bus collection of multiple instruments, with polling cycles up to tens of milliseconds.

6. How to select and maintain the antenna under high-viscosity or easy wall-hanging media?
Preferably select PTFE or ceramic antennas, add steam tracing or regular cleaning procedures during installation to avoid material adhesion affecting echo intensity.

7. How to achieve unified calibration and parameter synchronization for multiple radar level meters in batch projects?
Cloud platform or dedicated configuration software supports batch empty tank/full tank calibration, false echo area setting, and firmware OTA upgrade, reducing on-site individual debugging workload.

8. What is the development cycle and minimum order quantity for OEM customized antenna length and installation interface?
Standard customization cycle is 4-8 weeks. Minimum order quantity depends on specifications. Sample verification and first batch production support are provided to ensure complete matching with process containers.

Conclusion

Nexisense radar level meter takes narrow beam high signal-to-noise ratio, non-contact measurement, and flexible communication interfaces as core advantages and has verified its engineering applicability in multiple chemical, environmental protection, pharmaceutical, and food projects. System integrators, EPC contractors, and process control engineers are welcome to contact us to obtain detailed installation manuals, sample testing arrangements, and project cooperation solutions to jointly improve the accuracy and reliability of level measurement for storage tanks and process containers.