M518-00-880 Issue A
Page 6 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.4 Flammable atmospheres
There are two flammable zones (atmospheres) associated with Edwards dry pump systems. The definitions of these
two zones are as follows:
This manual covers the range of temperature (T) classifications that can be applied to pumping systems.
1.5 ATEX certification
The CXS/EH Pumping combination system can be configured to achieve a number of different levels of certification
from internal Category 3 to internal Category 1 and external Category 3 to external Category 2. The CXS/EH Pumping
combination system can also be configured for certification with T3, T160 or T4 temperature classes. The CXS/EH
Pumping combination system is suitable for pumping IIB3 atmospheres internally and installation in IIB atmospheres
externally.
The ATEX rating of your CXS/EH Pumping combination system will be determined by the lowest rated component in
the system. Refer to the system rating label mounted on the support framework for the specific rating applicable to
your system.
An example of this identification is shown below:
External The atmosphere around the outside of the Edwards system and everywhere within the
equipment where it is possible for this atmosphere to be present.
Internal The atmosphere inside the Edwards pumping system where process can be present.
An X suffix to the ATEX equipment category shown on your system rating label indicates that
special conditions for "safe use" apply to your system. These conditions are defined in this
Instruction Manual. You must ensure that the appropriate actions are undertaken to comply with
the operating conditions so defined.
Consult The CXS and EH Pump manuals for details of the ATEX certification for the CXS pump and
EH mechanical booster pump. The manuals contain important details relevant to the ATEX
certification of these pumps.
To Next Page
Loading...
