Siemens FDOOT221 Technical Manual page 30

2BStructure and function
3
19BDetector
30 | 138
Building Technologies
Fire Safety
The combination of optical and thermal sensor signals optimizes detection
reliability. This has the following advantages:
● Early detection of all types of fire, whether they generate light or dark smoke, or
no smoke at all.
● The neural fire detector can be operated at a lower sensitivity level and thus
achieves a higher immunity against false alarms which can be caused by cold
aerosols (e.g. by smoking, electrical welding, etc.). In the case of an open fire,
the smoke sensitivity is heightened by the temperature increase, which means
that a detection reliability level that is comparable to that of the wide-spectrum
smoke detector can be achieved.
The neural fire detectors FDOOT241-x/-Ax can also be used either as purely
optical smoke detectors or pure heat detectors. This is possible by selecting one of
the following sensor modes (with the detector exchanger and tester or on the
control panel):
● Sensor mode 0: Application as neural fire detector
● Sensor mode 1: Application as heat detector
● Sensor mode 2: Application as smoke detector
In sensor mode 1 or 2 the parameter sets of the heat detector FDT241 or of the
wide-spectrum smoke detector FDO241, respectively, can be selected. These
neural fire detectors then act in a similar way to heat detector FDT241 or smoke
detector FDO241.
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2015-11-04