Limaco ULM-3D Series, Руководство по эксплуатации и установке

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Fig. 3.4. ULM-3D-5 level transmitter on the tank
Radar level transmitter aerial system emits a radio signal with a frequency of about
125 GHz and receives an echo signal reflected from the product surface. The elec-
tronic unit processes the echo signal by means of a software and hardware complex
and converts it into a corresponding output signal that carries information about the
measured value.
1 – level transmitter;
2 – emitted signal;
3 – reflected signal;
4 – the surface of measured product.
Fig. 3.5. Measurement method
The level transmitter operates as a FMCW (Frequency Modulated Continuous
Wave) radar. This is one of conventional methods of non-contact distance mea-
surement, which minimizes the influence of spurious interference and interference
associated with irregularities (disturbances) of the surface of measured product.
The operation concept is as follows: a low-power microwave generator generates a
probing radio signal with linearly increasing frequency during the measurement pe-
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