Operation Liquiline CM442/CM444/CM448
92 Endress+Hauser
Path: Menu/Setup/Additional functions/Limit switches/Limit switches 1 to 8
Function Options Info
Cleaning program Options
•None
• Cleaning 1
• Cleaning 2
• Cleaning 3
• Cleaning 4
Factory setting
None
Use this function to choose the cleaning instance which
should be started when the limit switch is active.
Function Options
•On
•Off
Factory setting
Off
Activating/deactivating the limit switch
Operating mode Options
• 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→ å 86
• Measured value within or outside a range → å 87
•aChange rate→ å 89
Limit value Settings
Depends on the measured
value
Operating mode="Above limit check" or "Below limit
check"
a0018080
Fig. 86: Exceeding (A) and undershooting (B) a limit value (without hysteresis and switch-on delay)
1 Limit value
2 Alarm range
t
1
,t
3
,t
5
No action
t
2
,t
4
An event is generated
• If the measured values (MV) are increasing, the relay contact is closed when the on-value is exceeded ("Limit 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 ("Limit value" -
"Hysteresis") and following the release delay ("Switch off delay").
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