RMG ERZ2000-NG, Operating Manual

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6 Flow meters
Manual ERZ 2000-NG · EN07 · 2019, May 13th
195
Polynomial method
There are various ways to describe the characteristic curve. These methods are usu-
ally more accurate in the lowest flow rate range, particularly when no support point
correction takes place here.
"Polynomial Q RMG" describes the typical characteristic curve for RMG meters. With
"Polynomial Re RMG", a Reynolds-number dependency is also taken into considera-
tion. "Straatsma" is a seldom-used special form.
Note
If "DsfG: F instance COM6/7" is selected under the table, "cv = constant" is
adopted for the kv mode.
Coordinate
GD09 defines whether calculation continues with or without a correction
after a maximum deviation GD08 has been exceeded.
Coordinate
GD11 determines the assignment in (or against) the direction of the route
as a fixed assignment or it depends on the billing mode.
The direction of the different billing modes is defined according to a direction table in
coordinates
GD12 to GD15 .