Heat Detector - Siemens FDOOT221 Technical Manual

3.3.3
Building Technologies
Fire Safety

Heat detector

The heat detector is a pure heat detector with two thermal sensors. The following
heat detectors are available:
FDT241
FDT221
The following table indicates the most important differences between the two heat
detectors.
Parameter
Signal processing
Alarm activation by:
Structure and function
1
1 Heat sensors
As there are two sensors, thermal detection reliability will not fully fail should one of
the two sensors fail or break down.
FDT241
ASAtechnology
Temperature increase
Reaching the maximum
temperature
Structure and function
Detector
FDT221
Detection algorithms
Temperature increase
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