Siemens OOH740 - Danger and Warning Levels; Fire Detection Danger Levels

Structure and function
Function
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Building Technologies
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Fire Safety
2016-02-15
3.3.2 Danger levels and warning levels
3.3.2.1 Danger levels for fire detection
The point detector's signal processing efficiently distinguishes between fire events
and deceptive phenomena. If the following points apply, a danger level has been
reached:
● Measured values above a response threshold
● Progression of smoke density, temperature and CO concentration (only with
OOHC740) over a long period of time
The stated parameters are evaluated using algorithms (CO only with the parameter
sets 'Suppression CO' and 'Balanced CO').
Danger levels when operating on an addressed detector line
(C-NET)
The point detectors can transmit the following danger levels to the fire control
panel:
Danger level Meaning Comment
0 No danger Normal condition
1 Check situation
A different parameter set for fire
detection should possibly be
selected (inappropriate application)
2 Warning Possible danger
3 Alarm Fire
The evaluation of the danger level and the decisions to be taken (e.g. activation of
remote transmission) are configured in the fire detection system.
Danger levels when operating on a collective detector line
The point detector OOH740 can transmit the following danger levels to the fire
control panel:
Danger level Meaning Comment
0 No danger Normal condition
3 Alarm Fire