3.1.2 Alert Delays
A delay can be configured for alerts that are based on
limit value transgressions, if you wish to accept short-
term fluctuations. This can, for instance, be useful to
allow for a tolerated decline in temperature during
ventilation.
This value determines how long a limit needs to be
continuously transgressed for, before an alert is
triggered.
In this example, a delay of two minutes is configured.
The limit value is exceeded at 1:30
(1)
. The device,
however, only triggers an alert once the value is
exceeded for the entirety of the configured delay. In this
case that value is two minutes
(2)
.
Please be aware that the dead-band also applies to the
delay. This means that the value needs to return
towards its normal state by the dead-band’s value
during the delay time, in order to cancel the alert. In
this example, the sensor would therefore need to
measure a value below 25 °C within two minutes of the
first transgression, in order to cancel the alert.
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