Working principle

The high-frequency microwave pulse emitted by the guided wave radar propagates along the detection component (steel cable or steel rod), and encounters the measured medium. Due to the sudden change of the dielectric constant, it causes reflection, and a part of the pulse energy is reflected back. The time interval between the transmitted pulse and the reflected pulse is proportional to the distance of the measured medium.

Input

Guided wave radar is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into object level signal by electronic components. The probe emits high frequency pulse and propagates along the cable or rod probe. When the pulse meets the material surface, it is reflected back and received by the receiver in the instrument, and the distance signal is converted into object level signal.

The reflected pulse signal is conducted along the cable or rod probe to the electronic circuit part of the instrument, and the microprocessor processes the signal to identify the echo generated by the microwave pulse on the surface of the material. The correct echo signal identification is completed by the pulse software, and the distance D from the material surface is proportional to the time travel T of the pulse:

D minus C×T/2, where C is the speed of light

Since the distance E of the empty tank is known, the object position L is: L= E-D 

Output

By entering empty tank height E(= zero), full tank height F(= full range) and some application parameters, the application parameters will automatically adapt the meter to the measuring environment, corresponding to 4-20mA output.

Design features

    ◎Guided wave radar object level meter adopts advanced microwave processing technology and unique Echo Discovery Echo processing technology, contact measurement, high measurement accuracy, more accurate measurement. At the same time, guided wave radar is not affected by external environment such as medium temperature and adhesion.

    ◎The 70X series guided wave radar object level meter is suitable for various complex working conditions and applications due to the various process connection modes and detection module types. Such as: high temperature, high pressure and low dielectric constant medium.

    ◎Pulse working mode, low emission power, can be installed in a variety of metal, non-metal containers, no harm to human body and the environment.