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Issue/Rev. 0.2 (12/12)
Page 68
•
MN0M023
MEASURING MODE
(4004)
Use this function to define the measuring mode for the current output.
Options:
STANDARD
SYMMETRY
PULSATING FLOW
Factory setting:
STANDARD
Description of the individual options:
• STANDARD
The current output signal is proportional to the measured variable. The flow
components outside the scaled measuring range (defined by the 0_4 mA VALUE
m
and the 20 mA VALUE
n
) are taken into account as follows for signal output.
– If one of the values is defined as equal to the zero flow (e.g. VALUE 0_4 mA =
0 kg/h), no message is given if this value is exceeded or not achieved and the
current output retains its value (in example 4 mA).
If the other value is exceeded or not achieved, the message “CURRENT OUTPUT
AT FULL SCALE VALUE” appears and the current output responds in accordance
with the parameter setting in the function FAILSAFE MODE (4006).
– If both values defined are not equal to the zero flow (for example
VALUE 0_4 mA = –5 kg/h, VALUE 20 mA = 10 kg/h), the message “CURRENT
OUTPUT AT FULL SCALE VALUE” appears if the measuring range is exceeded or
not achieved and the current output responds in accordance with the parameter
settings in the function FAILSAFE MODE (4006).
A0001248
• SYMMETRY
The current output signal is independent of the direction of flow (absolute amount of the
measured variable). The 0_4 mA VALUE
m
and the 20 mA VALUE
n
must have the
same sign (+ or
-
). The “20 mA VALUE”
o
(e.g. backflow) corresponds to the mirrored
20 mA VALUE
n
(e.g. flow).
A0001249
!
Note!
• The direction of flow can be output via the configurable relay or status outputs.
• SYMMETRY cannot be selected unless the values in the VALUE 0_4 mA (4002) and
VALUE 20 mA (4003) functions have the same sign or one of the values is zero. If the
values have different signs, SYMMETRY cannot be selected and an “ASSIGNMENT
NOT POSSIBLE” message is displayed.
Function description
OUTPUTS
o
CURRENT OUTPUT (1...3)
o
CONFIGURATION
Q
20
4
0
mA
➀
➁
Q
20
0
mA
4
➂
➀
➁
7 Block OUTPUTS
Device Functions Proline Promass 83
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