Planning
ASD 531, Technical description, T 140 416 en
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4.9
Restrictions
Notice
The following restrictions apply to the use and application of the ASD 531. For other solutions, please consult the
manufacturer.
General information and space surveillance:
•
The sampling holes of the tube network and the detector housing must be in the same climate zone (pres-
sure/temperature zone) (sampled air may have to be recirculated to the other climate zone). Pressure differ-
ences between detector housing and sampling pipe (sampling holes) are not permitted.
•
If sampling pipes with air at room temperature have to be routed through areas in which the temperature may
drop below 4°C, the tube parts in these areas may have to be specially installed (possibly by isolating the
sampling pipe as specified by the manufacturer).
•
Applications with a high level of dust and/or high atmospheric humidity require the use of accessory parts as
recommended by the manufacturer, e.g.: Filter-box/filter unit, dirt trap box, water retaining box or manual ball
valve for sporadic cleaning of the sampling pipe using compressed air (see also Sec. 11).
•
The maximum pipe length specified must
not
be exceeded.
•
Several rooms may only be monitored by one and the same aspirating smoke detector if so permitted by the
relevant guideline (e.g. DIN VDE 0833-2 in Germany, VKF Cantonal Fire Insurance Union in Switzerland).
•
In the event of an emergency the sampling holes must be accessible for cleaning (possibly by cleaning using
compressed air from the detector housing or under 0°C with nitrogen).
•
The fan has a noise level (possibly mount the detector housing in an acoustically insulated cabinet – e.g. ASD
sound insulation housing – or ancillary room, see also Sec. 5.4).
•
Special settings (larger airflow window, longer delay time etc.) may have to be made in areas with significant
temperature fluctuations of more than 20°C at both the sampling pipe and on the detector housing.
•
In spaces with high ambient temperatures of > 50°C and/or a humidity of > 80%, cooling sections may have to
be used in the sampling pipe.
•
Only those materials listed and approved by the manufacturer are to be used to create the system (compo-
nent of the device approval according to EN 54-20). Materials from other sources may be used only if the
manufacturer’s written consent has been obtained.
•
It is
not
permitted to monitor ex-zones with the ASD 531.
•
The environmental influences as listed in Sec. 4.10 must be observed.
Equipment monitoring (additional):
See Sec. 4.5
