RMG ERZ2000-NG, Operating Manual

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6 Flow meters
Manual ERZ 2000-NG · EN07 · 2019, May 13th
197
There are 16 support point pairs for forward operation and the polynomial coefficients
(at the end of the table). If "without correction" is entered in
GD07 for GD Determina-
tion of characteristic , the values still used again without correction. This corre-
sponds to the value "0" in all defaults of the correction points. The entered values are
adopted accordingly if the parameter is set to "with correction".
Figure 133: Charac-
teristic correction
shows how a correction takes place for the values provided in
Ta-
ble 5: Support point correction
( Note : the values match the values in
Figure 132:
Menu GE Forward operation characteristic curve correction)
.
Support point [%] 5 10 25 40 70 100
Deviation [%] 1.0 0.5 0.2 0.0 0.1 0.0
Table 5: Support point correction
Figure 133: Characteristic correction
The deviation is approximated linearly between the interpolation points.
Figure 133:
Characteristic correction
indicates the deviation 0.3% for the operating point 20%.
Therefore, the correction is calculated as follows:
݀݅ݏ݌݈ܽݕ݁݀ݒ݈ܽݑ݁ ൌ
݉݁ܽݏݑݎ݁݀ݒ݈ܽݑ݁
ሺͳ ൅ ݀݁ݒ݅ܽݐ݅݋݊ሻ
ൌ
݉݁ܽݏݑݎ݁݀ ݒ݈ܽݑ݁
ሺͳ ൅ ͲǤ͵ሻ
ൎ ݉݁ܽݏݑݎ݁݀ݒ݈ܽݑ݁ ή Ͳǡͻͻ͹