Endress+Hauser Proline Prosonic Flow 93T Portable Operating Instructions Manual page 92

Description of Device Functions
92
MEASURING MODE
(4004)
Functional description
TOTALIZER TOTALIZER  OPERATION
Use this function to define the measuring mode for the current output.
Options:
STANDARD
SYMMETRY
The current output signal is proportional to the measured variable. The flow
components outside the scaled measuring range (defined by the 0_4 mA VALUWE
n
and the 20 mA VALUE ) 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 m /h), no message is given if this value is exceeded or not
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 function FAILSAFE MODE (4006).
• If both values are defined as not equal to the zero flow

(e.g. 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 function FAILSAFE MODE (4006).
I [mA]
20
4
0
m
SYMMETRY
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!
• 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 signs of the two values differ, SYMMETRY cannot be selected and an
"ASSIGNMENT NOT POSSIBLE" message is issued.
Proline Prosonic Flow 93T Portable

/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
m
A0001248
n
must have
A0001249