Liquistation CSF48 Operation
Endress+Hauser 167
Range lower value Settings
Depends on the measured
value
Operating mode="In range check" or "Out of range check"
Range upper value
a0018081
Fig. 91: 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
t1, 2, 3, 4An 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
Fig. 92: Hysteresis using the example of limit value overshoot
1 Limit value
2 Alarm range
3 Hysteresis range
t1, t2An event is generated
The hysteresis is needed to ensure a stable switching
behavior.
The device software adds or subtracts the value set here
to the upper and lower limit value (Limit value, Range
lower value or Range upper value). The result is that the
hysteresis range around the limit value is double the
value for "Hysteresis".
An event is only generated if the measured value (MV)
completely crosses the hysteresis range. å 92
Path: Menu/Setup/Additional functions/Limit switches/Limit switches 1 to 8
Function Options Info
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