Endress+Hauser Proline Prosonic Flow 93C Description Of Device Functions page 42

6 Block OUTPUTS
42
OUTPUTS → CURRENT OUTPUT 1 → CONFIGURATION
MEASURING MODE Use this function to define the measuring mode for the current output.
(4004)
Options:
STANDARD
SYMMETRY
PULSATING FLOW
Factory setting:
STANDARD
Description of the individual options:
• STANDARD
• SYMMETRY
!
• 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
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Device functions Proline Prosonic Flow 93C PROFIBUS DP/PA
Functional description
(only with PROFIBUS DP)
The current output signal is proportional to the measured variable.
The flow components outside the scaled measuring range (defined by the
m
0_4 mA VALUE and the 20 mA VALUE
signal output.
– If one of the values is defined as equal to the zero flow (for example
3
/h), no message is given if this value is exceeded or not
VALUE 0_4 mA = 0 m
achieved and the current output retains its value (4 mA in the example). 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 FAILSAFE MODE function (4006).
– If both values are defined as not equal to the zero flow (for example
3
VALUE 0_4 mA = –5 m /h; VALUE 20 mA = 10 m
"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 setting in the FAILSAFE MODE function (4006).
I [mA]
20
4
0
m
The current output signal is independent of the direction of flow (absolute amount of
the measured variable). The 0_4 mA VALUE
the same sign (+ or -). The "20 mA VALUE"
n
mirrored 20 mA VALUE (e.g. flow).
o
Note!
VALUE 20 mA (4003) functions have the same sign or one of the values is zero. If the
signs of the two values differ, SYMMETRY cannot be selected and an
"ASSIGNMENT NOT POSSIBLE" message is issued.
n
) are taken into account as follows for
3
/h) the message
Q
n
m
and the 20 mA VALUE
o
(e.g. backflow) corresponds to the
mA
20
4
0 Q
m n
Endress+Hauser
A0001248
n
must have
A0001249