Limaco ULM-31-HF, Руководство по эксплуатации и установке

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ULM.0.01.000RE_10_08_20
Fig. 4.10. Measuring Beam Zone of Action
4.5 Dead Zone
The level transmitters have the so-called “dead zone”. This zone is close to the sen-
sor antenna. Its measuring is either difficult or impossible. The “dead zone” is
shown in Fig.4.11 and it may be conventionally divided into three regions. The
closest region (in the Figure on the left), which is impossible to measure. The medi-
um one – the region of unstable measurements. The device can determine the dis-
tance with low precision and the discontinuities of reading are possible. The distant
region of the “dead zone” – the measurements are stable there, but the device certif-
icate precision level is not achieved. The distance of the “dead zone” regions de-
pends on the product reflecting capacity and the available tank structures hit by the
sensor beam. The “dead zone” does not exceed 600 mm, provided that the regula-
tions for the sensor installation in the tank are observed.
Fig. 4.11. Device Dead Zone
Dead zone
Measuring is im-
possible Unstable meas-
urements
Stable measurements
with low precision Stable measurements
with rated precision
S
ensor a
n-
tenna
Working area
600 mm
0