©
AirSense Technology Ltd. 2005
Page 21
Stratos-Micra 100
• INSTALLER’S HANDBOOK • Iss. 3
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 100 detector. The use of ‘T’
branch-pipes is not recommended. The Stratos-Micra 100 detector is fitted with two
sampling pipe inlets as standard. It is always preferable to use two shorter pipes as
opposed to one longer pipe. If two sampling pipes are used, care should be taken to
keep the sampling pipe lengths and number of sampling holes on each pipe within
10% of the other. This can be verified using the PipeCAD system design software.
Unused sampling pipe inlets should be fitted with pipe bungs.
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 TWO Air Handling Units may be protected with one Stratos-Micra 100
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
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