Design Limitations - Kidde AirSense Stratos Micra 25 Installer's Handbook

5. Design
Stratos-Micra is intended to provide LOCALISED incipient fire detection only. This
Limitations
means that it is suitable for the substantial range of applications typified by; small
non-compartmentalised rooms, warehouse racking, or pieces of electronic or
electromechanical equipment where it is desirable to achieve individual incipient
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fire reporting. In compartmentalised rooms, each compartment would normally use
individual Stratos-Micra detectors.
IMPORTANT
This product employs a very low-power aspirator and the aspirating capability of the
Stratos-Micra detector is limited accordingly. Stratos-Micra is NOT intended to protect
large areas, or to sample from areas where there may be any difference in airflow
rates or pressure differentials. Application of Stratos-Micra in these circumstances is
not recommended. If detection in environments conforming to these descriptions is
required, alternative versions of Stratos products should be used.
Maximum recommended sampling pipe length is 50 metres in STILL AIR. In areas or
applications where the external airflow rate is greater than 1 metre per second, the
maximum sampling pipe length is reduced to 10 metres.
Although by no means essential, it must be recommended that if in doubt, PipeCAD ®
be used to ensure that transit times, balance of suction and individual sampling point
sensitivity are within desired limits.
In order for the installation to conform to EN54-20, pipes must conform at least to
EN61386-1 Class 1131.
Sampling pipes must have capped ends. The end cap should be drilled with a hole
normally between 4 or 5mm diameter and free from burrs. Sampling holes should
normally be 3-4mm diameter or as calculated by PipeCAD, and free from burrs. Each
pipe run should not have more than 10 holes (including the end cap hole). Pipe transit
time from the furthest sampling hole from the detector must not exceed 120 seconds
and an approved type of pipe must be used for installations conforming to LPCB
requirements. It is strongly recommended that the smoke transit time from the furthest
sampling hole be checked during commissioning tests.
Capillary Remote Sampling Points may be used in place of sampling holes.
Stratos-Micra is available with an optional 'Piped Exhaust' type Docking Station (see
illustration A). This is primarily intended to allow the Stratos-Micra detector to sample
from areas which may be at different air pressure to the detector location. Typical uses
are for air-duct sampling and allowing the installation of the detector in under-floor or
ceiling voids or when sampling from pieces of computer related equipment.
Page 20
Stratos-Micra • INSTALLER'S HANDBOOK • Iss. 16
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