Endress+Hauser Liquistation CSF34 - Page 128

Operation Liquistation CSF34
128 Endress+Hauser
Source of data Measured value
Selection
• Bipolar
(only for current outputs)
• Unipolar+
• Unipolar-
Mathematical
functions
All the mathematical functions can also be used as a data source and the calculated
value can be used as the measured value.
You can monitor the manipulated variable by assigning the controller manipulated
variable to a limit switch (e. g. configure a dosing time alarm).
Menu/Setup/Additional functions/Limit switches/Limit switch 1 ... 8
Function Options Info
Cleaning program Selection
• None
• Cleaning 1 ... 4
Factory setting
None
Use this function to choose which cleaning
instance should start when the limit switch is
active.
Function Selection
• Off
• On
Factory setting
Off
Activating/deactivating the limit switch
Operating mode Selection
• Above limit check
• Below limit check
• In range check
• Out of range check
• Change rate
Factory setting
Above limit check
Type of limit value monitoring:
• Limit value overshoot or undershoot→  67
• Measured value within or outside a range
→  68
• Rate of change →  70
Limit value Settings depend on the
measured value
Operating mode = Above limit check or Below
limit check
1
2
t
MV
t
1
t
2
t
3
t
4
t
5
1
2
t
MV
t
1
t
2
t
3
t
4
t
5
A B
A0028523
 67 Exceeding (A) and undershooting (B) a limit value (without hysteresis and switch-on delay)
1 Limit value
2 Alarm range
t
1,3,5
No action
t
2,4
An event is generated
• If measured values (MV) are increasing, the relay contact is closed when the switch-on point is exceeded
(Limit value + Hysteresis) and the start delay (Start delay) has elapsed.
• If measured values are decreasing, the relay contact is reset when the switch-off point is undershot (Limit
value - Hysteresis) and after the drop-out delay (Switch off delay).