16 Advanced functions
16.9 Behavior of the alarm outputs FLUXUS F502TE
2020-05-29, UMFLUXUS_F502TEV1-5EN
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The alarm will switch when the measured value reaches the limit.
A positive limit will be compared to the totalizer value for the positive flow direction.
A negative limit will be compared to the totalizer value for the negative flow direction.
The comparison will also take place if the totalizer of the other flow direction is displayed.
16.8.3 Defining the hysteresis
A hysteresis can be defined for the alarm output R1. This prevents a constant triggering of the alarm when measured
values fluctuate marginally around the limit.
The hysteresis is a symmetrical range around the limit. The alarm will be activated if the measured values exceed the
upper limit and deactivated if the measured values fall below the lower limit.
If the switching condition MAX or MIN is selected in the scroll list func:
• Enter a value for the hysteresis or enter zero to work without hysteresis.
• Press ENTER.
16.9 Behavior of the alarm outputs
16.9.1 Apparent switching delay
The measured values and totalizer values will be displayed rounded to 2 decimal places. The limits, however, will be compared
to the non-rounded measured values. This might cause an apparent switching delay when the measured value changes
marginally (less than 2 decimal places). In this case the switching accuracy of the output is higher than the accuracy of the
display.
Notice!
The unit of measurement of the limit is set according to the unit of measurement of the selected physical quantity.
If the unit of measurement of the physical quantity is changed, the limit has to be converted and entered again.
Example
physical quantity: mass flow rate in kg/h
Quantity Limit: 1 kg
Example
physical quantity: mass flow rate in kg/h
Low Limit: 60 kg/h
The unit of measurement of the physical quantity is changed to kg/min. The new limit to be entered is 1 kg/min.
Example
High Limit: 30 kg/h
Hysterese: 1 kg/h
The alarm is activated for measured values > 30.5 kg/h and deactivated for measured values < 29.5 kg/h.
R1 Input\...\Hysterese
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