LB radar level gauge

Radar level gauge, also known as microwave level gauge, is a new type of product that has developed rapidly in recent years. It uses electromagnetic waves for detection and has advantages that other level gauges do not have. Due to the fact that electromagnetic waves are not affected by propagation media, they can reliably work in complex working conditions such as high temperature, high pressure, steam, dust, and volatilization.

Measuring principle

The radar level gauge emits microwave pulses from the antenna or detection component (steel cable or steel pipe) to the object being measured. When propagating to the surface of the object, due to the difference between the medium of the object and air, the microwave is reflected on the surface of the object, and the echo is received by the antenna. By measuring the time difference from the transmitted signal to the returned signal, the distance and level can be measured.

Due to the high propagation speed of electromagnetic waves, it is difficult to confirm the time interval between the transmitted and received pulses. The radar level gauge uses a special correlation demodulation technique to accurately identify the time interval between the transmitted and received pulses, thereby further calculating the distance from the antenna to the surface of the measured medium. The echo is detected by a receiver, and the transmission time is used to calculate the level. The reflected radar waves are digitally converted into echo patterns, and the distance between the medium surface and the instrument reference point is determined by analyzing the echo patterns. The travel time and interval of microwave pulses from transmission to reception are proportional to the distance from the antenna to the measured medium surface.

Namely: h=H-v t/2 (where h is the liquid level, H is the barrel height, v is the radar propagation speed, and t is the time from transmission to reception)

Illustration

1. Blind spot range
2. Total range (H in the equation)
3. High position 20 m A position
4. Low position 4 m A position
5. Height of the interface
6. Measurement range
Note: The reference surface for measurement is the sealing surface of the thread or flange.

Application features
1. Non contact measurement, unaffected by material characteristics such as viscosity, noise, steam, dust, pressure, temperature, specific gravity, etc;
2. Measurable dielectric constant>1 All liquids and solids of 8 have a maximum measurement range of 70 meters and strong anti-interference ability;
3. Equipped with on-site display debugging module, easy to operate on-site, and easy to set up programs in Chinese/English, suitable for ordinary people to operate;
4. High frequency pulse energy is concentrated, the antenna size is small, and it is convenient to install dust-proof devices. The small bucket groove measurement also has good results;
5. There is automatic false echo learning, automatic detection of obstacles in the testing area, and automatic filtering of obstacles in the bucket;
6. The maximum temperature can reach 400 ° C, and the maximum pressure can reach 400kg/cm2;
7. The guided wave type can meet the requirements of places with small dielectric constant;
8. Suitable for use in metal or non-metal tanks, without harm to human body and the environment;