Guided wave radar level gauge

Guided wave radar level gaugeintroduction

Guided wave radar level gaugeHigh frequency microwaves were used to propagate along the probe, but due to encountering the measured medium, the dielectric constant suddenly changed, causing reflection. The time interval between the emitted pulse and the reflected pulse is proportional to the distance of the measured medium. Special time extension methods can ensure stable and accurate measurements in a very short period of time. Even when there is false reflection, the microprocessor technology and software can accurately analyze the level echo, and the instrument can be debugged empty. The application in solid-state measurement can use high-frequency sensors in the K-band. Due to the excellent focusing effect of the signal, the installation objects inside the silo or the adhesive objects on the silo wall will not affect the measurement.

Product Features

1. Adopting advanced microprocessors and ChoDiscovery echo processing technology, it can be applied to various complex working conditions;

2. Adopting a pulse working mode, the transmission power is extremely low, and there is no harm to the human body and the environment;

3. Made of extremely stable materials, unaffected by changes in medium density, viscosity, and temperature;

4. 4-20mA output or digital signal output.

Guided wave radar level gaugeworking principle

It is a measuring instrument based on the principle of time travel. Radar waves travel at the speed of light, and the travel time can be converted into level signals through electronic components. The probe emits high-frequency pulses and propagates along the cable. When the pulses encounter the surface of the material, they are reflected back and received by the receiver inside the instrument, which converts the distance signal into a level signal.

The reflected pulse signal is transmitted along the cable or pole probe to the electronic circuit of the instrument, and the microprocessor processes this signal to identify the echo generated by the microwave pulse on the surface of the material. The correct identification of echo signals is completed by pulse software, and the distance D from the material surface is proportional to the time travel T of the pulse:
D=C×T/2
Where C is the speed of light
Since the distance E of the empty tank is known, the level L is:
L=E-D
By inputting the empty tank height E (=zero), full tank height F (=full range), and some application parameters to set, the application parameters will automatically adapt the instrument to the measurement environment. Corresponding to 4-20mA output.