Endress+Hauser Liquiline System CA80PH, Operating Instructions Manual

Page: 117 / 208

Liquiline System CA80PH Operation
Hauser
117
Range lower value Settings
Depends on the measured
value
Operating mode="In range check" or "Out of range check"
Range upper value
a0018081
Abb. 75: Monitoring outside (A) and inside (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 ("Range lower value" +
"Hysteresis") has been exceeded 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. 76: Hysteresis taking the example of limit value over-
shoot
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 or from the limit value (Limit value, Range lower
value or Range upper value). This results in the double
"Hysteresis" value for the hysteresis range around the
limit value.
An event is generated only if the measured value (MV)
completely passes through the hysteresis range.
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å
76
Path: Menu/Setup/Additional functions/Limit switches/Limit switches 1 to 8
Function Options Info