FMC Technologies Proline Promass 83 E - Function Description

Issue/Rev. 0.2 (12/12) MN0M023 • Page 79
Device Functions Proline Promass 83 7 Block OUTPUTS
MEASURING MODE
(4206)
! Note!
This function is not available unless the FREQUENCY setting was selected in the
OPERATION MODE function (4200).
Use this function to define the measuring mode for the frequency output.
Options:
STANDARD
SYMMETRY
PULSATING FLOW
Factory setting:
STANDARD
Description of the individual options:
•STANDARD
The frequency output signal is proportional to the measured variable. The flow
components outside the scaled measuring range (defined by the VALUE F LOW m and
the VALUE F HIGH n) are not taken into account for signal output.
– If one of the values is defined as equal to the zero flow (e.g. VALUE F LOW =
0 kg/h), no message is given if this value is exceeded or not achieved and the
frequency output retains its value ( 0 Hz in the example). If the other value is
exceeded or not achieved, the message “FREQUENCY OUTPUT AT FULL SCALE
VALUE” appears and the frequency output responds in accordance with the
parameter setting in the function FAILSAFE MODE (4209).
– If both values defined are not equal to the zero flow (for example VALUE F LOW =
–5 kg/h; VALUE F HIGH = 10 kg/h), the message “FREQUENCY OUTPUT AT
FULL SCALE VALUE” appears if the measuring range is exceeded or not achieved
and the frequency output responds in accordance with the parameter settings in the
function FAILSAFE MODE (4209)...
A0001279
SYMMETRY
The frequency output signal is independent of the direction of flow (absolute amount of
the measured variable). The VALUE F LOW m and VALUE F HIGH n must have the
same sign (+ or
-). The VALUE F HIGHo (e.g. backflow) corresponds to the mirrored
VALUE F HIGH n (e.g. flow).
A0001280
! 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 F LOW (4204) and
VALUE F HIGH (4205) 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.
(continued on next page)
Function description
OUTPUTS o PULSE/FREQUENCY OUTPUT (1...2) o CONFIGURATION (FREQUENCY)
Q
125
100
0
Freq.
➀➁
Q
125
100
Freq.
0
➀➁➂