16 Advanced functions
FLUXUS G809
16.12 Behavior of the alarm outputs
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UMFLUXUS_G809V2-2EN, 2020-06-25
16.11.3 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.
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.
16.12 Behavior of the alarm outputs
16.12.1 Apparent switching delay
The measured values and totalizer values will be displayed rounded to 2 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 2 decimal places). In this case the switching accuracy of the output is higher than the accu
-
racy of the display.
16.12.2 Reset and initialization of the alarms
After an initialization of the transmitter, all alarm outputs will be configured as follows:
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
Tab. 16.3: Alarm state after an initialization
func
OFF
typ
NON-HOLD
mode
NO Cont.
Limit
0.00
