Selection Guide for Radar Level Gauge: 5 Core Factors and Practical Techniques

As an important liquid level measurement device in the industrial field, the selection of radar level gauges directly affects measurement accuracy, stability, and service life. Starting from practical application scenarios and combining industry experience and technical specifications, this article summarizes the core points of selecting radar level gauges to help you efficiently match your needs.

一、 Clear measurement requirements: matching accuracy and functionality Accuracy level selection

1.Accuracy level selection

Trade level scenarios (such as energy metering and product handover): High precision models (0.5 or 1.0 level) should be selected to ensure data authority.18

Process control scenario: Select medium precision (1.5 or 2.5 levels) according to control requirements.

Ordinary monitoring scenario: Optional economical plug-in radar level gauge (4.0 level) 18.

2.Measurement range and caliber

Determine the measuring range based on the depth of the container and the range of liquid level changes to avoid "overusing" or "over limit failure".

If the pipeline flow rate is lower than 0.5m/s, the instrument diameter needs to be reduced to increase the flow rate and ensure measurement accuracy.

二、 Media characteristics: determine core parameters

1.Temperature and pressure tolerance

Guided wave radar: conventional type with temperature resistance ≤ 130 ℃, high-temperature type with temperature resistance ≤ 200 ℃; The maximum pressure resistance is 10 kilograms (special customization is not economical).
Low frequency horn mouth radar: temperature resistance up to 300 ℃, pressure resistance of 60 kg, suitable for high temperature and high pressure scenarios.
High frequency radar: temperature resistance generally ≤ 200 ℃, pressure resistance of 60 kg, high customization cost for high temperature 4

2.Corrosion and Material Selection

Conventional corrosive medium: Choose 316 stainless steel antenna material.

Strong corrosive media (such as hydrochloric acid, nitric acid): probes lined with polytetrafluoroethylene or sprayed with polytetrafluoroethylene should be used.

Special scenario: Low frequency/high-frequency rod radar should be preferred, but attention should be paid to the limitation of blind spots (0.5-0.7 meters) on small containers

3.Dielectric constant and signal reflection

Low dielectric constant medium (such as liquefied gas, gasoline): It is necessary to use a waveguide to enhance signal reflection.

High viscosity media (asphalt, residual oil): parabolic antenna is recommended for more reliable anti condensation design.

4.Interference between foam and steam

When the thickness of foam is ≤ 2cm, the influence is small; If it exceeds the limit, priority should be given to using low-frequency radar or guided wave radar for penetration measurement.

Under steam environment, guided wave radar and low-frequency radar have stronger anti-interference ability

三、 Environment and installation conditions: Ensure stable operation

1.Installation location and structure

Sealed container: The minimum connecting pipe for guided wave radar is DN40, for low-frequency radar it is DN50, and for high-frequency radar it must be ≥ DN100 (when there is stirring or steam) 6.

Avoid electromagnetic interference sources (motors, transformers) and reserve a safety distance of 25.

2.type adaptation

四、 Security and Certification: Compliance Assurance

五、 Economy and Maintenance: Long term Cost Optimization

Conclusion

Further reading