Particulate Contamination - Lenovo RackSwitch G8272 Installation Manual

Particulate Contamination

62
RackSwitch G8272 Installation Guide
Attention: Airborne particulates (including metal flakes or particles) and reactive
gases acting alone or in combination with other environmental factors such as
humidity or temperature might pose a risk to the device 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 device 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 Lenovo determines that the levels of particulates or gases in
your environment have caused damage to the device, Lenovo may condition
provision of repair or replacement of devices or parts on implementation of
appropriate remedial measures to mitigate such environmental contamination.
Implementation of such remedial measures is a customer responsibility.
Contaminant Limits
•
Particulate The room air must be continuously filtered with 40% atmospheric dust
spot efficiency (MERV 9) according to ASHRAE Standard 52.2
•
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.
•
The deliquescent relative humidity of the particulate contamination
must be more than 60%
•
The room must be free of conductive contamination such as zinc whis-
kers.
•
Gaseous Copper: Class G1 as per ANSI/ISA 71.04-1985
•
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
1
.