FLUXUS F808, F809 17 Outputs
156 UMFLUXUS_F808_8091V1-2-1EN, 2019-08-23
If the switching condition QUANT. is selected in the scroll list func, the limit of the output will have to be defined:
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.
17.6.3 Defining the hysteresis
A hysteresis can be defined for the alarm output R1. This prevents a constant triggering of the alarm when measured val-
ues 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 up-
per limit and deactivated if the measured values fall below the lower limit.
17.7 Behavior of the alarm outputs
17.7.1 Apparent switching delay
Measured values and totalizer values will be displayed rounded to two decimal places. The limits, however, will be com-
pared to the non-rounded measured values. This might cause an apparent switching delay when the measured value
changes marginally (less than two decimal places). In this case, the switching accuracy of the output is greater than the
accuracy of the display.
switching condition: QUANT.
Enter the limit of the totalizer. Press ENTER.
The alarm will switch when the measured value reaches the limit.
Note! The unit of measurement of the limit corresponds 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 en-
tered again.
example 1: physical quantity: volumetric flow rate in m³/h
Quantity Limit: 1 m³
example 2: physical quantity: volumetric flow rate in m³/h
Low Limit: 60 m³/h
The unit of measurement of the physical quantity is changed to m³/min. The new limit to be entered is
1 m³/min.
example: High Limit: 30 m³/h
Hysterese: 1 m³/h
The alarm will be triggered at values > 30.5 m³/h and deactivated at values < 29.5 m³/h.
switching condition:
MIN or MAX
Enter the value for Hysterese.
or
Enter 0 (zero) to work without a hysteresis.
Press ENTER.
Quantity Limit:
1.00 m3
R1 Hysterese:
1.00 m3/h
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