FMC Technologies Proline Promass 83 E - Function Description

Issue/Rev. 0.2 (12/12)
Page 104 • MN0M023
7 Block OUTPUTS Device Functions Proline Promass 83
MEASURING MODE
(4705)
! Note!
This function is not visible unless a limit value was assigned to the relay output.
Use this function to define the measuring mode for the relay output.
Options:
STANDARD
The relay output signal switches at the defined switch points.
SYMMETRY
The relay output signal switches at the defined switch points, irrespective of the sign. If
you define a switch point with a positive sign, the relay output switches as soon as the
value is reached in the negative direction (negative sign), (see illustration).
Factory setting:
STANDARD
Example for the SYMMETRY measuring mode:
Switch-on point Q = 4
Switch-off point Q = 10
m = Relay energized
n = Relay de-energized
A0001247
! Note!
• SYMMETRY cannot be selected unless the values in the ON VALUE (4701) and OFF-
VALUE (4703) 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.
TIME CONSTANT
(4706)
Use this function to enter a time constant defining how the measuring signal reacts to
severely fluctuating measured variables, either very quickly (enter a low time constant) or
with damping (enter a high time constant).
Damping acts on the measuring signal before the switch status changes, and
consequently before switch-on or switch-off delay is activated.
The purpose of damping, therefore, is to prevent the relay output changing state
continuously in response to fluctuations in flow.
User input:
fixed-point number: 0.00...100.00 s
Factory setting:
0.00 s
Function description
OUTPUTS o RELAY OUTPUT (1...2) o CONFIGURATION
0
-4
-10
4
10
Q
t
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