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Operation
Application Screens
Figure 4-32. Process Alarm Tabs
High and Low Alarms
If the set point value is greater than the clear point, the alarm is a High alarm. In this
case, the alarm is activated as the measurement value increases above the set point
value. The alarm stays active until the measurement value again goes below the clear
point. If the clear point value is greater than the set point, then the alarm is a Low
alarm. In this case, the alarm is activated as the measurement value goes below the set
point. The alarm stays active until the measurement value again goes above the clear
point.
In the high alarm depiction below, the measurement rises above the set point and
remains there longer than 10 seconds, the time entered in the Action Delay (sec)
textbox. Therefore, after 10 seconds, the alarm is triggered and continues until the
measurement drops below the clear point. In the second instance, the measurement
does not rise above the set point for 10 seconds, so the alarm is not triggered.
In the low alarm depiction, the measurement drops below the set point and remains
there longer than 10 seconds, the time entered in the Action Delay (sec) textbox.
Therefore, after 10 seconds, the alarm is triggered and continues until the
measurement rises above the clear point. In the second instance, the measurement does
not drop below the set point for 10 seconds, so no alarm occurs.
4-51
Thermo Scientific
LevelPRO User Manual
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