Chapter 3: Installation
Stratos EX Hazardous Area Aspirating Smoke Detection System Installation Manual 23
• Pipework should be metal and bonded to earth/ground to eliminate static
electricity buildup. Selection of pipe is left to the site engineers, but the
internal diameter should be between 20 and 25 mm.
• The exhaust air from the unit must not be impeded in any way. If the unit is
mounted in a different air pressure from where the air is being sampled (for
example an air duct), then a pipe must be taken from the exhaust port back to
the same air pressure zone as the sampling holes.
• Sampling holes should be free from burrs and swarf.
• All signal cables must be screened and must be of a suitable type. The
specific type of cable will normally depend upon the local fire and hazardous
area regulations.
• The unit must not be placed in areas where either the temperature or humidity
is outside the specified operating range.
• The unit should not be placed in close proximity to any equipment expected to
generate high radio frequency levels (such as radio alarms) or units
generating high levels of electrical energy (such as large electric motors or
generators).
Standards and requirements
The installer should refer to the latest edition of the following standards before
operating in a hazardous area:
EN 1127-1: Explosive Atmospheres – Explosion prevention and protection, basic
concepts and methodology.
EN 60079-14: Electrical apparatus for explosive gas atmospheres Part 14:
Electrical installations in hazardous areas (other than mines).
EN 60079-17: Electrical apparatus for explosive gas atmospheres Part 17:
Inspection and maintenance of electrical installations in hazardous areas (other
than mines).
Enclosure installation
The EX detector must be fixed to a solid location using the four mounting holes
as shown in Figure 8 on page 24.
A mounting template is included in Appendix A “Mounting template” on page 57
to simplify mounting.
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