Burkert Type 8620 - Manual (Page 60)

mxCONTROL Type 8620
Page 60
Figure 15:
Alarm/warning -
switching hysteresis
For displaying and data logging purposes there are adjustable upper and lower warning limits and a
separate warning hysteresis WarnHys.
The alarm and warning limits are configured in the unit of the process value.
The function scope of the alarm and warning function can be configured as follows:
Alarm mode Description
Alarm & Warn Alarm and warning function enabled.
Alarm Only alarm function enabled. Parameters of the warning function are not indicated.
disable Alarm and warning function not enabled. Parameters are not indicated.
If one of the two alarm limits is not required while the alarm function is enabled, this alarm limit is to be
set to a value outside of the accessible process value range.
Example: Flow measurement, process value range: 0 - 10 L/s, no alarm required at lower alarm
limit Æ set lower alarm limit to -1L/s
Alarm activation is equipped with a switching hysteresis (AlarmHys) to prevent excessive
switching. The hysteresis has to be parameterized in percent of input range (i.e. the input
range (Scal- … Scal+) corresponds to 100 %).