Siemens FD20 User Manual

2BStructure and function
19BDetector
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Building Technologies
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Fire Safety
2015-11-04
3.4.3 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
FDT241
FDT221
Signal processing
ASA
technology Detection algorithms
Alarm activation by: ● Temperature increase
● Reaching the maximum temperature
● Temperature increase
Structure and function
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.
1

Siemens FD20 Specifications

General

Brand	Siemens
Model	FD20
Category	Security Sensors
Language	English