Structure and function
3
Function
25
Building Technologies
A6V10367521_h_en_--
Fire Safety
2015-02-02
3.2.2 Danger levels
The detector's signal processing efficiently distinguishes between fire events and
deceptive phenomena. The basis for reaching a danger level is not only given by
measured values exceeding a "response threshold"; moreover, the smoke density
progression is observed over a longer period of time and assessed by the
algorithms.
The automatic fire detector OOH740-A9-Ex can transmit the following danger
levels to the control panel:
Danger level
Meaning
Comment
0
No danger
Normal condition
1
Check the situation
A different parameter set should
potentially be selected (inappropriate
application)
2
Warning
Possible danger
3
Alarm
Fire
l
The danger level evaluation and the decisions that are to be taken (e.g.
activation of remote transmission) are configured in the control panel.
l
On a collective line only the danger levels 0 and 3 can be transmitted to the
control panel.
3.2.3 Diagnosis levels
The point detector monitors its operation largely autonomously. The signals of all
sensors are permanently monitored.
The following components in particular should be monitored for correct
functionality:
l
Temperature sensors
l
Light emitters
l
Light receivers
Signal processing takes account of the monitoring results and adapts its behavior
accordingly.
The following diagnosis levels are derived from the different control measurements:
l
Normal
l
Observe information
l
Replacement recommended
l
Replacement necessary
l
Fault
When an error occurs which impairs the correct functionality of the device, a fault
message is reported to the control panel.
3.2.4 Automatic recognition of the detector line protocol
The automatic fire detector OOH740-A9-Ex can communicate using various
detector line protocols. The detectors recognize the protocol on the detector line
(e.g. C-NET-Ex or collective) and automatically switch to the protocol in question.
This functionality facilitates commissioning in case of modernization, as no actions
need to be taken on the detector itself. For exceptions, see 'List of compatibility'.
