Structure and function
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Building Technologies 007004_k_en_--
Fire Safety & Security Products 16.04.2009
3.4.3 Diagnosis levels
For the most part, the detector monitors its function by itself. The signals of all
sensors are permanently monitored. In particular, the temperature sensors, light
emitters, and light receivers are monitored to ensure that they are functioning
correctly. Signal processing takes account of the monitoring results and adapts its
behavior accordingly.
The following diagnosis levels are derived from the different control measurements:
z Normal
z Observe information
z Replacement recommended
z Replacement necessary
z Fault
See the table below for details.
A fault message is signaled in the event of a fatal error that makes the proper
function of the detector impossible. To correct the cause of the fault, additional
information is available in the detector. This information may be displayed, for
example, by the detector exchanger and tester FDUD29x (for details see
documents 007227 and 009718).
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