Liquiline CM442R/CM444R/CM448R Operation
Endress+Hauser 89
Range lower value Settings
Depends on the measured
value
Operating mode="In range check" or "Out of range check"
Range upper value
a0018081
Fig. 64: 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
Fig. 65: 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
"Hysteresis" 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.
å 65
Path: Menu/Setup/Additional functions/Limit switches/Limit switches 1 to 8
Function Options Info
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