Hochiki FIRElink-NANO - Manual (Page 12)

Page 12 of 21 FIRElink-NANO Air Sampling Detector – Installation and User Manual
© 2010 Hochiki Europe (UK) Ltd 9-5-0-425/ISS1/JUL10
7 Installation: Pipework
Sampling pipe
¾” pipe or 25mm pipe with a ¾” sleeve
adapter.
The maximum sampling pipe length is
50m.
Fit an end cap with an appropriately-sized
hole to optimize airflow through the pipe.
This end cap hole is also a sampling hole.
Use the PipeCAD
®
pipe layout modelling
software to plan pipe installations. For EN
54-20 compliance, indicated hole
sensitivities must be better than, or equal
to: 0.80% obs/m (Class A), 1.66% obs/m
(Class B) or 5.85% obs/m (Class C)
Do not glue the pipe into the sampling
inlet.
Exhaust pipe
¾” pipe or 25mm pipe with a ¾” sleeve
adapter.
If the protected area is at a lower
atmospheric pressure than the location in
which the detector is installed (e.g. a
closed air-conditioned room), fit a return
pipe run from the detector exhaust to the
protected area, in order to equalise the
pressure. This will improve detector
performance.
Even if the protected area and detector are
at the same atmospheric pressure, it is
good practice to fit a pipe stub with a bend
to the exhaust, to prevent debris falling into
the detector.
Do not glue the pipe into the exhaust
outlet.