Full-Domain Solutions for Industrial Level Measurement: LF/YD Series Radar Technology In-depth Selection Guide

In industrial process control, the complexity of level measurement environments (such as dust, steam, agitation, corrosion, and extreme pressure) requires sensors to have a high degree of adaptability. As a professional manufacturer in the field of industrial sensing, Nexisense provides full-scenario measurement support for global system integrators and engineering contractors by building three major technology matrices: 80GHz, 26GHz, and 500MHz-1.8GHz (guided wave).

80GHz High-Frequency FMCW Technology: A Generational Leap in Precision and Stability

As Nexisense's core flagship, the LF-20X series adopts 80GHz Frequency Modulated Continuous Wave (FMCW) technology, marking the entry of non-contact measurement into the "millimeter-level" era.

1. Technical Core: LF-20X1/X2/X3

• Extremely Narrow Beam Angle (<3°): The energy is highly concentrated, allowing it to accurately avoid obstacles and side wall interference inside the tank. For narrow and deep tanks or installations with limited space, its reliability far exceeds that of traditional low-frequency radar.

• 100m~150m Ultra-long Range: Designed for large cement silos, power plant fly ash bins, and bulk grain silos, it maintains linear precision of ±1mm even under long-distance detection.

• Low Power Design (70mW-90mW): Suitable for remote IoT nodes, easily connecting to digital factory networks via RS485/Modbus or two-wire HART.

2. Adaptability to Extreme Conditions: YD-Series

For scenarios involving heavy dust, easy crystallization, and condensation in solid powders, the YD series utilizes a universal flange design and specific algorithm optimization to ensure stable echo signals can still be captured even when the material's angle of repose is large.

26GHz Pulse Radar: The Performance Balancer for Mature Conditions

The 26GHz frequency series is currently the most widely used and cost-effective choice for industrial applications. Nexisense has performed refined functional classification for it:

1. Liquid and Chemical Measurement (LF-201/202/2020T)

• LF-201/2020T: Specifically targeted at highly corrosive liquids such as acids, bases, and solvents. Its all-fluorine sealed (PTFE/PFA) antenna structure ensures complete isolation between electronic components and the medium.

• LF-202: Enhanced temperature and pressure resistance type, supporting process temperatures up to 250°C, suitable for high-temperature and high-pressure reaction kettles.

2. Solid Particles and Complex Environments (LF-204/205)

• LF-205: Adopts a parabolic antenna design, particularly suitable for granular and powdery solid materials. Even within an 80m range, it can receive weak reflection signals through a large-area antenna.

• LF-207: Specialized for areas prone to adhesion and condensation. Through special signal gain compensation, it solves the problem of measurement drift caused by material buildup on the front end of the antenna.

Guided Wave Radar: The Ultimate Solution for Low Dielectric Constants

For oils with extremely low dielectric constants (<2.0) or liquids with severe surface fluctuations, non-contact radar may experience signal loss. In such cases, LF-001/002 guided wave radar demonstrates irreplaceable stability.

• Contact Conduction: Electromagnetic waves propagate along the cable or metal rod with minimal energy loss, unaffected by bubbles, fluctuations, or vacuum environments.

• LF-002 (All-Teflon Sealed): Dedicated to highly corrosive media measurement, combining the stability of guided wave technology with top-tier anti-corrosion materials, it is the standard configuration for fine chemical projects.

Key Technical Specifications Comparison of the Full Series

FAQ: Professional Q&A for System Integrators and Senior Engineers

Q1: In 100-meter cement silo measurement, why is LF-20X3 a better choice than the YD series?

A: The beam angle of 80GHz is less than 3°, while the YD series is typically around 8°. In deep silos, the energy of the YD series will hit the side walls due to beam divergence, forming interference echoes. The LF-20X3 narrow beam has high energy concentration, and FMCW provides a better signal-to-noise ratio, effectively identifying the real material surface rather than the dust layer.

Q2: If the measurement medium is a strong alkali (such as liquid caustic soda), how should the antenna material and connection method be selected?

A: It is recommended to choose LF-206 or LF-002. It is mandatory that the antenna part uses all-Teflon (PTFE) sealing. For the process connection, flange connection is recommended, with a Teflon gasket installed on the flange face to ensure that the metal housing does not come into direct contact with strong alkali vapors.

Q3: Is the tensile load a mandatory indicator to consider when guided wave radar measures solid powders?

A: Yes. During the discharging process, solid materials exert a huge pulling force on the cable. Nexisense's guided wave series has been structurally reinforced, but during selection, engineers must calculate the static pull based on material density and silo height. If necessary, a single-rod type or a thicker weighted cable should be selected.

Q4: What is the "blind zone" of 80G radar? Is there a risk for overflow warning?

A: The minimum blind zone of the LF-20X series is as low as 0.045m. Compared to the 0.3m-0.5m blind zone of traditional radar, 80G radar has a significant advantage in full-tank alarm applications, allowing for fuller utilization of container capacity and providing a longer response buffer period.

Q5: How are these devices protected against lightning in outdoor open-air environments?

A: Nexisense radar level meters have integrated primary lightning protection circuits. However, for field projects in areas with frequent thunderstorms, integrators should install dedicated external signal surge protectors and ensure that the instrument housing is reliably grounded to counter the impact of induced lightning on the 4-20mA loop.

Q6: Can a radar with RS485 output be directly connected to the analog module of a PLC?

A: No. RS485 outputs a digital signal using the Modbus RTU protocol, which needs to be connected to a PLC communication module (such as CM1241). If connection to an analog module is required, please specify the 4-20mA/HART two-wire output version when ordering.

Summary

The research and development logic of Nexisense LF/YD series radar level meters always revolves around the dual goals of "physical adaptability" and "data accuracy."

• For metrological applications requiring extreme precision: 80GHz FMCW technology is the undisputed standard.

• For diverse and cost-sensitive liquid monitoring: The 26GHz series provides differentiated coverage from anti-corrosion and hygiene to temperature resistance.

• For complex working conditions and media with special physical characteristics: Guided wave technology provides the ultimate guarantee of stability.

Through standardized dimensional designs (such as Φ96/Φ125 enclosures) and universal process interfaces (M20×1.5 cable entries), Nexisense ensures high compatibility of products in various system integration solutions.

Technical Note: All products comply with IP67 protection rating and Exdia IIC T6 Ga/Gb explosion-proof certification. When dealing with ultra-high temperatures above 250°C or high-pressure conditions above 4MPa, please contact technical support in advance. We will provide special cooling components and pressure compensation solutions.