'Detection' task card
Neural fire detector OOHC740
11
173 | 412
Building Technologies
A6V10210424_j_en_--
Fire Safety
2018-08-29
If the temperature or CO concentration deviates from the threshold value, the
input can switch between active and inactive. To prevent this, a hysteresis can
be defined. As soon as the threshold value is reached and the input is
activated, it is not deactivated again until the temperature or the CO
concentration at least drops below the threshold value or rises above it by the
defined hysteresis value.
Hysteresis values:
– 'Normal'
– 'Large/slow'
●
'Threshold temperature (Celsius)'
The temperature threshold values can be set here. If this threshold value is
undershot or exceeded (depending on 'Usage'), the channel becomes active.
The threshold value must be between -20 °C and +50 °C.
This field can only be edited if the 'Temperature higher than threshold (Celsius)'
or 'Temperature lower than threshold (Celsius)' setting was selected for
'Usage'.
●
'Threshold CO concentration (ppm)'
The CO concentration threshold values can be set here. If this threshold value
is exceeded, the channel becomes active. The threshold value must be
between 20 and 600 ppm.
This field can only be edited if the 'CO concentration higher than threshold
(ppm)' setting was selected for 'Usage'.
The following can be set in the 'Overview' tab:
Figure 60: Detail editor with settings for environment monitoring
●
'Evaluation filter time'
Here, the time during which a signal must be present such that the input is
evaluated as active can be set for the input. A time of between one second and
five minutes can be set. Do not use this setting together with 'Hysteresis'.