Siemens OOH740 - Temperature Monitoring; CO Monitoring

Planning
Technical Ambient Supervision Message
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Building Technologies
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Fire Safety
2016-02-15
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 OOHC740 is -20…+50 °C
The adjustable threshold for the OOH740 is -20…+55 °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.
See also
2 Technical data for OOH740 [➙ 99]
2 Technical data for OOHC740 [➙ 102]
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.