VEGA VEGAPULS series 60 Recurring function test - Manual (Page 6)

Information:
Document the recurring function test, for example, in the test protocol
in the supplement.
The following conditions must be fulfilled when performing the
recurring function test:
0
dB
1
2
Fig. 1: Level echo - VEGAPULS
1
Amplitude of the useful echo above the noise level (signal/noise ratio)
2 Noise level
l The level must be in the following areas:
-
Min. distance to the level: Lower antenna edge +200 mm
-
Level above the vessel bottom ≥ 250 mm
-
Reliability at least 20 dB (amplitude of the useful logarithmic
echo above the noise level). The reliability can be verified
during the test.
l
The process conditions must be nearly constant (level, process
pressure, process temperature).
l
The medium must be the same as during setup or the medium
must at least belong to the same product group
-
Solvents/Liquid gases/Hydrocarbons/Oils (DK value < 3)
-
Chemical mixtures (DK value 3 … 10)
-
Water/Acids/Bases (DK value > 10 or conductive)
6 Recurring function test • for VEGAPULS series 60
2 Prerequisites
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-EN
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