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Fire Safety
2016-03-03
4.4.1.1 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 a range that exceeds the permissible
ambient temperature.
The adjustable threshold value 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.
4.4.1.2 CO monitoring
CO monitoring compares the current measured CO concentration with a preset
threshold value.
Alarming takes place when the current measured CO concentration temperature
exceeds the set threshold value.
You can set the CO concentration threshold value in stages of 5 ppm between
20 and 600 ppm.
Hysteresis range and average over 15 minutes
You can choose between two options:
A fixed hysteresis range of 5 % of the threshold value. Alarming takes place
immediately if the threshold value is exceeded.
– For low CO concentrations, a minimum hysteresis range of 2 ppm is
specified.
– For high CO concentrations, the hysteresis range is limited to 15 ppm.
The average CO concentration over the last 15 minutes is calculated. Alarming
takes place if the threshold value is exceeded. The hysteresis range is
permanently set to 6 ppm.