How to Select Guided Wave Radar Level Transmitter and Radar Level Transmitter

When selecting a level transmitter, guided wave radar level transmitters and radar level transmitters are two common choices. They are both based on radar technology and used for measuring the level of liquids, solids, or powders. When choosing a level transmitter suitable for a specific application, several factors need to be considered, including the working environment, medium characteristics, measuring range, accuracy requirements, etc. The following is a detailed analysis of the selection principles of guided wave radar level transmitters and radar level transmitters.

How to Select Guided Wave Radar Level Transmitter and Radar Level Transmitter

Working Principles and Technical Characteristics

Guided Wave Radar Level Transmitter

Guided wave radar level transmitter is a high-precision instrument commonly used for measuring the level of liquids or solid materials. Its working principle is based on the propagation and reflection of microwave signals.

When the guided wave radar level transmitter is installed above the container, it sends microwave signals into the container. These microwave signals propagate along the waveguide or antenna and reflect back at the liquid surface or material surface.

Once the microwave signals reach the liquid surface or material surface, some of the signals are reflected back to the level transmitter. The transmitter receives these reflected signals and determines the position of the liquid level or material surface by measuring the time delay of the signal. Since the propagation speed of microwave signals between air and liquid or material is known, the level transmitter can accurately calculate the position of the liquid level or material surface.

  • Suitable for various media, including viscous liquids, corrosive liquids, and high-temperature liquids.
  • It has high measurement accuracy and stability, capable of reliable operation under complex process conditions.
  • Suitable for high-temperature, high-pressure, and corrosive environments.

26G Non-contact radar level transmitter

 

Radar Level Transmitter

Radar level transmitter is a commonly used level measurement device in the industrial field, and its working principle is based on free-space radar technology, using microwave signals to measure the level height.

Firstly, the radar waves emitted by the radar level transmitter propagate towards the liquid surface at a certain speed. When these waves encounter the liquid surface, they are partially reflected back. The reflection process is influenced by the properties of the liquid surface, such as dielectric constant and surface roughness.

The radar level transmitter receiving the partially reflected waves calculates the time from emission to reception, known as time delay. Using this time delay and the speed of radar waves in the air, the level transmitter can accurately calculate the distance between the liquid surface and the sensor, thus determining the height of the liquid level.

Additionally, radar level transmitters usually consider the influence of the medium’s dielectric constant on the propagation speed of waves because media with different dielectric constants affect the propagation speed of waves differently. By correcting these factors, radar level transmitters can improve measurement accuracy and precision.

  • Suitable for most liquid and solid media, but less adaptable to media prone to crystallization, sedimentation, and foam.
  • It has strong anti-interference capability and adaptability, suitable for level measurement in complex environments and harsh conditions.
  • Suitable for long-distance measurement and applications requiring high precision.

Radar Level Gauges (6)

 

Measurement Environment and Process Conditions

Guided Wave Radar Level Transmitter:

  • Suitable for high temperature, high pressure, and corrosive environments, such as chemical plants and petrochemical industries.
  • Exhibits good adaptability to media with large surface fluctuations or concentration changes.
  • Shows high measurement stability under conditions like oscillation, jetting, and agitation in processes.

Radar Level Transmitter:

  • Applicable to most general industrial environments and liquid level measurement scenarios, such as water treatment plants, storage tanks, and power plants.
  • Signal attenuation or reflection may occur in liquids with foam, crystallization, or sediment, requiring careful selection of installation positions.
  • Consider the temperature compensation and density correction functions of radar level transmitters in situations of significant temperature or density variations.

Measurement Range and Accuracy Requirements

Guided Wave Radar Level Transmitter:

  • Suitable for medium-range liquid level measurement, typically ranging from several meters to tens of meters.
  • Provides high measurement accuracy, usually achieving millimeter-level precision.
  • Offers stable and accurate measurement results for high viscosity liquids or media with agitation.

Radar Level Transmitter:

  • Applicable to wide-range liquid level measurement, covering ranges from several meters to hundreds of meters.
  • Performs well in long-distance measurement and scenarios with high precision requirements, typically achieving centimeter-level accuracy.
  • Shows better advantages for measuring liquid levels in large containers or high storage tanks.

Installation and Maintenance Requirements

Guided Wave Radar Level Transmitter:

  • Requires installation of waveguide tubes or waveguide probes and is suitable for relatively complex installation environments.
  • Due to the presence of multiple sensor components, maintenance and cleaning tasks are relatively complex, requiring regular inspection and maintenance.

Radar Level Transmitter:

  • Installation is simple, typically requiring fixation on the wall of the container or storage tank.
  • Maintenance and cleaning tasks are simpler since there is no need to contact the liquid, usually requiring only periodic inspection of the external environment and sensors.

Cost Considerations

Guided Wave Radar Level Transmitter:

  • Due to its complex technology and design, the cost of guided wave radar level transmitters is usually higher.
  • Suitable for scenarios with high requirements for measurement accuracy and stability, providing a higher return on investment over the long term.

Radar Level Transmitter:

  • Relatively lower cost, suitable for general industrial environments and moderate liquid level measurement requirements.
  • For scenarios with limited budgets or not particularly strict liquid level measurement requirements, radar level transmitters are an economical choice.

Summary

When choosing between guided wave radar level transmitters and radar level transmitters, a comprehensive evaluation is needed based on specific process conditions, measurement requirements, installation environments, and budget considerations. Guided wave radar level transmitters are suitable for high temperature, high pressure, and corrosive environments with high requirements for measurement accuracy and stability, while radar level transmitters are suitable for general industrial environments and common liquid level measurement scenarios, offering advantages such as lower cost, easy installation, and convenient maintenance.

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