VEGA VEGAFLEX 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
0
V dB
3
1
2
Fig. 1: Level echo - VEGAFLEX
1
Echo curve
2 Logarithmic echo curve
3 Amplitude of the useful echo (logarithmic echo curve)
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)
l
The level must be either in the following areas:
-
Distance to the process fitting ≥ 200 mm.
-
Min. covering of the rod electrode ≥ 100 mm/cable electrode
≥ 250
mm.
-
-
or the following requirement must be fulfilled:
-
-
Reliability at least 20 dB (amplitude of the useful logarithmic
echo above the noise level). The reliability can be verified
during the test.
6 Recurring function test • for VEGAFLEX series 60
2 Prerequisites
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