A708-01-880 Issue E
Page 10 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
Non hazardous gases and vapours do not constitute a hazard should they leak into the external environment or should
the pump develop an inward air leakage, this could include one or more of the following:
z Vapours
z Inert gases
z Materials below the lower flammability limit
z Non toxic materials
z Non corrosive materials.
Pumps that are suitable for pumping non hazardous gases and vapours cannot be guaranteed not to leak small
amounts of gas (greater than 10
-3
mbar l s) into or out of the pump, therefore it has to be assumed that there is the
possibility for some pumped gases to be present in the external atmosphere.
Note: Where pumps suitable for non hazardous gases and vapours are used to pump inert gases they should be
located in a well ventilated area in order to avoid the possibility of asphyxiation.
The CDX pumps are suitable for Hazardous Area operation. Refer to the CDX pumping system instruction manual
which will specify the technical specification and hazard classification of the system.
IDX pumps are only suitable for Safe Area operation: see Section 1.9.2.
1.8 Accessories
A number of accessories are available for the CDX and IDX pumps; use these to configure the pump for specific
applications.
These accessories are listed in Section 7.4.
1.9 Normal/abnormal operation
1.9.1 Normal operation: CDX pumps
In normal operation, depending on the flame arrestors fitted and the level of systemisation, CDX pumps are safe to
handle gases as follows:
External
Ex II 2 G c k IIB, IIC T3, T160, T4
Internal
Ex II 1,2 G B3, IIB T3, T4
To find out which certification has been assigned to the pumping system, refer to the system nameplate and specific
system documentation.
If the CDX pump is part of a hazardous area system, it may be fitted with integral or external flame arrestors: refer
to the CDX pumping system instruction manual.
If the CDX pump is part of an ATEX system, it may be fitted with integral or external flame arrestors: refer to the
ATEX system instruction manual.
1.9.2 Normal operation: IDX pumps
IDX pumps are designed for Safe Area applications only.
Do not use the IDX pump in hazardous areas, or pumping hazardous gases/dusts.
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