17 Advanced functions
17.7 Event trigger FLUXUS WD
2018-07-16, UMFLUXUS_WDV1-3EN
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Afterwards the properties of the event trigger are defined, see Tab. 17.5.
Tab. 17.4: Description of the source items
source item list item output
Flow quantities Flow velocity
Volumetric flow rate
Mass flow rate
Totalizers Volume (+) totalizer for the volumetric flow rate in positive flow direction
Volume (-) totalizer for the volumetric flow rate in negative flow direction
Volume (Δ) difference of the totalizers for the positive and negative flow direction
Mass (+) totalizer for the mass flow rate in positive flow direction
Mass (-) totalizer for the mass flow rate in negative flow direction
Mass (Δ) difference of the totalizers for the positive and negative flow direction
Diagnostic values Amplitude signal amplitude
Quality signal quality
SNR ratio useful signal/noise signal
SCNR ratio useful signal to correlated noise signal
VariAmp amplitude fluctuation
VariTime transit time fluctuation
Amplification amplification, important to receive a useful signal
PIG detection signalizes whether a pig is detected
This display will only be indicated if PIG detection is activated.
Sound speed Sound speed measured sound speed in the fluid
Sound speed (Δ) difference of the measured sound speed and the sound speed calculat-
ed from the fluid data
Tab. 17.5: Properties of the event trigger
property event trigger setting description
Function
(switching condition)
MAX (x>limit) The event trigger will switch if the measured value exceeds the upper
limit.
MIN (x<limit) The event trigger will switch if the measured value falls below the low-
er limit.
ERR (x=fail) The event trigger will switch if a measurement is not possible.
Within range The event trigger will switch if the measured value is within the de-
fined range.
Out of range The event trigger will switch if the measured value is outside the de-
fined range.
Type
(holding behavior)
Non-hold If the switching condition is no longer true, the event trigger will return
to the idle state after approx. 1 s.
Hold The event trigger remains activated even if the switching condition is
no longer met.
Hold for a while The event trigger remains activated during a defined time even if the
switching condition is no longer met.
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