Particulate Contamination - IBM EN4093R User Manual

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Particulate contamination

Attention:
gases acting alone or in combination with other environmental factors such as
humidity or temperature might pose a risk to the switch module that is described in
this document. Risks that are posed by the presence of excessive particulate levels
or concentrations of harmful gases include damage that might cause the switch
module to malfunction or cease functioning altogether. This specification sets forth
limits for particulates and gases that are intended to avoid such damage. The limits
must not be viewed or used as definitive limits, because numerous other factors,
such as temperature or moisture content of the air, can influence the impact of
particulates or environmental corrosives and gaseous contaminant transfer. In the
absence of specific limits that are set forth in this document, you must implement
practices that maintain particulate and gas levels that are consistent with the
protection of human health and safety. If IBM determines that the levels of
particulates or gases in your environment have caused damage to the switch
module, IBM may condition provision of repair or replacement of switch module or
parts on implementation of appropriate remedial measures to mitigate such
environmental contamination. Implementation of such remedial measures is a
customer responsibility.
Airborne particulates (including metal flakes or particles) and reactive
Table 4. Limits for particulates and gases
Contaminant Limits
Particulate v The room air must be continuously filtered with 40% atmospheric dust
spot efficiency (MERV 9) according to ASHRAE Standard 52.2
v Air that enters a data center must be filtered to 99.97% efficiency or
greater, using high-efficiency particulate air (HEPA) filters that meet
MIL-STD-282.
v The deliquescent relative humidity of the particulate contamination
must be more than 60%
v The room must be free of conductive contamination such as zinc
whiskers.
Gaseous v Copper: Class G1 as per ANSI/ISA 71.04-1985
v Silver: Corrosion rate of less than 300 Å in 30 days
1
ASHRAE 52.2-2008 - Method of Testing General Ventilation Air-Cleaning Devices for
Removal Efficiency by Particle Size. Atlanta: American Society of Heating, Refrigerating and
Air-Conditioning Engineers, Inc.
2
The deliquescent relative humidity of particulate contamination is the relative humidity at
which the dust absorbs enough water to become wet and promote ionic conduction.
3
ANSI/ISA-71.04-1985. Environmental conditions for process measurement and control
systems: Airborne contaminants. Instrument Society of America, Research Triangle Park,
North Carolina, U.S.A.
2
.
3
Appendix B. Notices
1
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