4.3. Protection of the key equipment
REK511 is a device which installs high sensitive detectors internally. It can be installed in the sample pipe. Its detectors
will work after power on 24 VDC. If the smoke concentration exceeds the alarm threshold, the relay will trigger (open or
closed), send an alert to the fire alarm system or the fire indicator disc (LED indication, marked the location of each LED).
If the detectors have a fault, it can also send fault information through the relay.
For equipment monitoring and positioning, we can use REK511 (each cabinet has two sample apertures at least is
recommended) to monitor and positioning each cabinet or each row of cabinets. So the 30 sample aperture of ASD535-3 can
monitor 15 cabinets (or 15 rows of cabinets).Fig 7 shows the schematic diagram of monitoring and positioning equipments.
Considering the airflow of a data center is relatively large, we recommend to add the airflow collector when installing
sample apertures in the top or back of the device, Fig 8 shows it.