Siemens OOH740-A9-Ex - Ambient Conditions

Planning
4
Technical Ambient Super
vision Message
43
Building Technologies A6V10367521_h_en_--
Fire Safety 2015-02-02
4.6.1 Ambient conditions
In markets where the use of the 'Technical Ambient Supervision Message' is
permitted, the point detector can be positioned above or near objects which require
the ambient temperature to be monitored in order to prevent damage.
'Technical Ambient Supervision Message' mode detects an increase or decrease in
temperature.
You can set the following parameters using the 'Cerberus-Engineering-Tool'
software:
l Threshold value in the range of -20…+70 °C
l Alarming when the temperature threshold value is exceeded or undershot
l Hysteresis
You will find more detailed information in the fire detection system documentation.
Example of temperature monitoring caused by hysteresis:
t
20
25
30
35
40
1
2
3
Ambient supervision message/output signal when the ambient temperature threshold value
of 35 °C is exceeded and a hysteresis of 5 °C is selected
1 Temperature progression 3 Hysteresis
2
Message/output signal
When an ambient temperature of 35 °C is reached, the point detector sends a
message to the control panel. As long as the hysteresis is not undershot, the
message is sent.
In the example shown, the message is no longer sent once the ambient
temperature of 30 °C (threshold value minus hysteresis) is undershot.