16 Advanced functions
16.10 Behavior of the alarm outputs FLUXUS F501
2020-06-30, UMFLUXUS_F501V1-3EN
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16.10.4 Alarm outputs during measurement
An alarm output with switching condition MAX or MIN will be updated max. once per second to avoid humming (i.e. fluctuation
of the measured values around the value of the switching condition).
An alarm output of the type NON-HOLD will be activated if the switching condition is met. It will be deactivated if the switching
condition is no longer met. The alarm remains activated for at least 1 s even if the switching condition is met for a shorter pe-
riod of time.
Alarm outputs with the switching condition QUANT. will be activated if the limit is reached.
Alarm outputs with the switching condition ERROR will only be activated after several unsuccessful measuring attempts.
Therefore, typical short-term disturbances of the measurement (e.g., switching on of a pump) will not activate the alarm.
Alarm outputs with the switching condition +→- -→+ and the type NON-HOLD will be activated with each change of the flow
direction for approx. 1 s, see Fig. 16.1.
Alarm outputs with the switching condition +→- -→+ and of the type HOLD will be activated after the first change of the flow
direction. They can be switched back by pressing key C 3 times, see Fig. 16.1.
When adjusting to changed measurement conditions e.g, a substantial increase of the fluid temperature, the alarm will not
be switched. Alarm outputs with the switching condition OFF will be set automatically to the switching function NO Cont.
The alarm state can be displayed after the configuration of the alarm outputs and during the measurement. This function is
activated in Special Funct.\SYSTEM settings\Dialogs/Menus. The activation of this function is recommended
when alarm outputs have to be reconfigured frequently.
• Select the menu item SHOW RELAIS STAT.
• Select on to activate the alarm state indication.
• Press ENTER.
If the alarm state indication is activated, the alarm output state is displayed after configuring the alarm outputs.
The alarm state indication is structured as follows:
Rx =
, with X being the number of the alarm output and a pictogram according to Tab. 16.3.
The configuration of the alarm outputs can be repeated by pressing key C. When the configuration of the alarm outputs is
finished, press ENTER. The main menu will be displayed.
If the alarm output indication is activated, the alarm state can be displayed during the measurement. Press key to
scroll through the upper line or key in the lower line until the alarm state is displayed.
Fig. 16.1: Behavior of a relay when the flow direction changes
Notice!
There is neither a visual nor an acoustic indication of the alarm output switching.
Special Funct.\SYSTEM settings\Dialogs/Menus\SHOW RELAIS STAT
flow flow
type NON-HOLD type HOLD
approx. 1 s
reset of the alarm
(3 times key C)
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