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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 1
6
5.1 System Design
Simple designs with short sampling pipes produce the best results. Complex sampling
pipe runs should be avoided with the Stratos-Micra detector. The use of ‘T’ branch-
pipes is not recommended. To assist in design and to verify system performance, it is
advisable to use the PipeCAD
®
sampling pipe modelling software.
Always locate the sampling points in positions to which smoke may reasonably be
expected to travel. Do not expect ceiling mounted sampling points to operate
satisfactorily if air flow from air-conditioning systems keeps the cool smoke from an
incipient fire reaching from reaching ceiling level. In this instance it is usually better
to locate the sampling pipe directly in the airflow (for example across the return air
register of an air conditioning unit).
There is no substitute for carrying out smoke tests prior to installation of pipe work to
indicate suitable sampling point location.
No more than ONE Air Handling Unit may be protected with one Stratos-Micra
detector. In this application, ensure that the sampling pipe is raised clear of high
velocity air in the immediate vincinity of the air intake grille on stand-off posts as
shown below.
Detector
Detector
Standoff posts
AHU
equipment
cabinet
Sampling pipe
Direction
of smoke
Incorrect
Correct