Radar level transmitter, also known as microwave level meter, is a new product that has developed rapidly in recent years. It uses electromagnetic wave for detection, which has advantages that other Level sensor do not have. Because electromagnetic wave is not affected by the propagation medium, it can work reliably in complex working conditions such as high temperature, high pressure, steam, dust, volatilization, etc.

Measuring principle
The radar level meter emits microwave pulses from the antenna or detection component (steel cable or steel pipe) to the measured object. When propagating to the surface of the object, due to the difference between the medium of the measured object and the air, the microwave reflects on the surface of the object, and the echo is received by the antenna. By measuring the time difference from the transmission signal to the return signal, distance and level are measured.
Due to the high propagation speed of electromagnetic waves, it is difficult to confirm the time interval between transmitting and receiving pulses. The radar level meter uses a special correlation demodulation technique to accurately identify the time interval between transmitting and receiving pulses, thereby further calculating the distance between the antenna and the surface of the measured medium. The echo is detected by a receiver, and the transmission time is used to calculate the material level. The reflected radar wave is digitally converted into an echo pattern. By analyzing the echo pattern, the distance from the surface of the medium to the instrument reference point is determined. The travel time and interval of the microwave pulse from transmission to reception are proportional to the distance from the antenna to the surface of the measured medium.
That is, 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
4. Low position 4 m A
5. Height of the interface
6. Measurement range
   Note: The reference plane for measurement is the sealing surface of the thread or flange.

Application characteristics

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 7 0m and strong anti-interference ability;
3. Equipped with on-site display and debugging module, easy on-site operation, easy to set program in Chinese/English, suitable for ordinary people to operate;
4. The high-frequency pulse energy is concentrated, the antenna size is small, and it is convenient to install dust-proof devices. The small bucket slot 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 barrel;
6. The maximum temperature can reach 400 ° C and the maximum pressure can reach 400kg/cm2;
7. The guided wave formula can meet the requirements for places with small dielectric constant;
8. Suitable for metal or non-metallic bucket slots, without harm to human body and environment;