Factors Affecting Radar Level Meter Measurement: Temperature, Pressure, Medium

Radar level gauges mainly use non-contact measurement methods, are almost not limited by the measurement medium, and can meet the measurement needs of most closed or open containers. However, in practical applications, although radar level gauges have obvious advantages, they are still affected by some factors, leading to measurement errors. The main influencing factors include temperature, dust medium and working pressure.

1. The effect of temperature on radar level gauge is because radar is a mechanical wave, and changes in temperature will affect changes in the speed of sound. In actual measurements, various natural factors may cause errors. To solve this problem, advanced measurement systems are equipped with temperature sensors and software functions that automatically compensate for temperature effects. In practical applications, the surrounding environment of the non-contact measurement radar level gauge probe, the temperature of the radar propagation medium and the temperature of the measured medium may be different. Therefore, the measurement system should choose an external temperature sensor with a built-in temperature sensor and a separate probe according to actual needs. A more accurate measurement system can generate a reference echo by placing an echo-reflecting reference object at a certain distance from a specific position on the probe to compensate for temperature effects. The effectiveness of this method depends on the accuracy with which the echo-reflection reference objects are placed.

2. Dust is also one of the important factors affecting the non-contact measurement of radar level gauge. The impact of dust environment on the speed of sound is minimal, but it has a significant impact on the attenuation of radar, which is the main obstacle when implementing the radar level gauge solution. In practical applications, radar level gauge probe solutions using low frequency and special plastic surfaces have achieved great success in dusty environments.

3. The working pressure mainly affects the radar level gauge probe. At the same time, there is a certain relationship between pressure and temperature, so changes in pressure will affect the temperature, which in turn affects the change in the speed of sound. For this situation, it is important to reasonably consider the effect of pressure changes on temperature.