Endress+Hauser Proline Prosonic Flow 93 Function Manual page 95

Device functions Proline Prosonic Flow 93
Endress+Hauser
OUTPUTS
MEASURING MODE
!
(4705)
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 switching 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
➀
➁
!
• SYMMETRY cannot be selected unless the values in the ON-VALUE (4701) and
• If the signs of the two values differ, SYMMETRY cannot be selected and an
TIME CONSTANT Use this function to enter a time constant defining how the measuring signal reacts to
(4706) 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 conse-
quently before switch-on or switch-off delay is activated.
The purpose of damping, therefore, is to prevent the relay output changing state continu-
ously in response to fluctuations in flow.
User input:
fixed-point number 0.00...100.00 s
Factory setting:
0.00 s
Functional description
➞
RELAY OUTPUT (1...2)
Note!
= Relay energised
= Relay de-energised
Q
10
4
0
- 4
- 10
➀ ➁
Note!
OFF-VALUE (4703) functions have the same sign or one of the values is zero.
"ASSIGNMENT NOT POSSIBLE" message is issued.
7 Block OUTPUTS
➞
CONFIGURATION
➀
➀ ➁ ➀
t
A0001247
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