Measuring principles

Guided wave radar is a gauge based on time stroke principle, the radar wave is running at speed of light, the running time can be converted to material level signal through electric components. The sensor emit high frequency impulse and transmit along the cable, when impulse meets the material surface, it reflects back and is received by receiver inside the gauge, and converts the distance signal to material level signal.  

 Input

The reflected impulse signal is transmitted along the cable to the circuit of the gauge; the microwave processor processes this signal, and recognizes the wave echo of the microwave impulse from the material surface. The correct wave echo signal is recognized by the intelligent software, the distance from the material surface D is proportional to the time stroke of the impulse T:

   D=C×T/2

   Among them, C is the velocity of light.

   As the distance of the empty tank E is known, so L is:

   L=E-D 

Output

      By inputting empty tank height E (=cero point), full tank height F (=full measuring range) and some application parameters are set, the application parameters will automatically make the gauge adapted to the measuring environment, it corresponds 4-20mA output.

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