Endress+Hauser Liquistation CSF48 - Page 95

Liquistation CSF48 Additional functions
95
Range lower value Settings
Depends on the measured
value
Operating mode="In range check" or "Out of range check"
Range upper value
a0018081
Abb. 10: Monitoring outside (A) and within (B) a range (without hysteresis and switch-on delay)
1 End of range
2 Start of range
3 Alarm range
t
1, 2, 3, 4
An event is generated
• If the measured values (MV) are increasing, the relay contact is closed when the on-value is exceeded ("Range lower
value" + "Hysteresis") and the start delay has elapsed ("Start delay").
• If the measured values are decreasing, the relay contact is reset when the off-value is undershot ("Range upper value"
- "Hysteresis") and following the release delay ("Switch off delay").
Hysteresis Settings
Depends on the measured
value
Operating mode="In range check", "Out of range
check","Above limit check" or "Below limit check"
a0018140
Abb. 11: Hysteresis taking the example of limit value
overshoot
1 Limit value
2 Alarm range
3 Hysteresis range
t
1
, t
2
An event is generated
The hysteresis is needed to ensure a stable switching
behavior.
The device software adds or subtracts the value set here
to/from the limit value (Limit value, Range lower value
or Range upper value). This results in the double "Hyste-
resis" value for the hysteresis range around the limit
value.
An event is then only generated if the measured value
(MV) completely passes through the hysteresis range.
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Path: Menu/Setup/Additional functions/Limit switches/Limit switches 1 to 8
Function Options Info