RMG ERZ2000-NG, Руководство по эксплуатации

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5 Transmitters
Manual ERZ 2000-NG · EN07 · 2019, May 13th
178
The input to which the signal is connected is assigned in the selection field for the
"Source". The setting for whether the signal is connected as 4..20 mA or Hard should
also be made here.
The correction value causes an offset shift. It is calculated from: Reference value mi-
nus display value and is entered directly in the unit of the pressure. Example:
value read on the reference device
= 20.00 bar,
value displayed on the ERZ2000-NG = 20.02 bar,
result -0,02 bar
This value must be entered in line 21 (
Figure 119: Menu AB Absolute pressure
) with
the correct algebraic sign.
The base value is the uncorrected measurement (before offset correction with the
value
AB21 ).
The format of the pressure value can be changed in super user mode. If "%.5f" is
shown in the display, the "5" indicates the number of decimal places. You can
change this as desire in the scope of the available values. For example, the number
"12.345" is displayed as:
with "%.0f" as 12
with "%.1f" as 12.3
with "%.2f as 12.35
the rounding of the third decimal place is factored in
correctly here.
The calculations generally take place with 8 digits, wherein the 8th digit is subject to
rounding errors. Therefore, 7 digits are relevant, regardless of whether they are be-
fore or after the decimal separator. For example, with 5 digits before the decimal
separator, having 3 or more digits after the decimal separator does not make sense.
Adjust the number of digits on the sensors, if necessary.
More digits give you a false impression of accuracy that is not provided!
The internal calculations are always conducted internally with the maximum possible
accuracy, regardless of the selection of digits. If a measurement, e.g. pressure, has
more than 7 digits before the decimal separator, the selected unit is unfavorable. In
this case, the recommendation would be, for example, to use "MPa" instead of "Pa".
Data displayed as average values is presented below. The revision mean value is
used for the DSfG revision.
The blue fields contain the freeze values, but the time of the resolution must be con-
sidered here.