Siemens FDOOTC241 - Temperature Monitoring

Planning
54
Building Technologies A6V10209291_f_en_--
Fire Safety & Security Products 05.02.2010
Example of temperature monitoring caused by hysteresis:
20
25
30
35
40
T [°C]
t
1
2
3
Ambient supervision output signal when the ambient temperature threshold value of 35 °C is
exceeded and a hysteresis range of 5 °C is selected
1 Temperature progression 3 Hysteresis range
2 Output signal
When an ambient temperature of 35 °C is reached, the neural fire detector
FDOOTC241 sends an output signal to the control panel. As long as the hysteresis
range is not undershot, the output signal is sent.
In the example shown, the output signal is no longer sent once the ambient
temperature of 30 °C (threshold value minus hysteresis range) is undershot.
4.3.1.1 Temperature monitoring
Temperature monitoring compares the current measured temperature with a preset
threshold value.
You can select the following comparisons:
 Temperature exceeded: Alarming takes place when the measured temperature
exceeds the set threshold value.
 Temperature undershot: Alarming takes place when the measured temperature
undershoots the set threshold value.
The threshold value can be selected within the permissible ambient temperature for
the FDOOTC241.
The permissible ambient temperature for the FDOOTC241 is -20 … +50° C.
Hysteresis ranges
You can set two hysteresis ranges:
 Normal hysteresis range with a range of 1° C.
 Large hysteresis range with a range of 5° C.