Cleanness Requirements - H3C S3100-SI Series Quick Start Manual

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H3C S3100-SI Series Ethernet Switches
damage to the switch. High temperature for a long time will speed up
the aging of insulation material, greatly lower the reliability of the
switch and greatly reduce the life span of the switch.

2.2.2 Cleanness Requirements

Dust is a potential hazard to the safe operation of the switch.
Falling on the equipment, it may cause electrostatic adsorption, and
hence result in poor contact of the metal connectors or connection
points. This is more likely to happen when the indoor relative humidity
is low; in this case, it may not only shorten the device's working life,
but also incur communication failure. The requirements on dust
content and particle diameter in the equipment room are shown in the
following table:
Table 2-1 Requirements on dust content in the equipment room
Physical active
substance
Dust particle
Note: Dust particle diameter ≥ 5µm
Besides the requirements on dust, rigorous requirements are
also set on the content of chloride, acid, and sulfide in the air of the
equipment room. These kinds of harmful gas will accelerate metal
corrosion and aging of certain parts. The equipment room should be
protected from the intrusion of harmful gases such as SO
and Cl . The limits of these kinds of harmful gas are shown in the
2
following Table.
Unit
particle/m³
2-3
Chapter 2 Installation
Content
4
≤ 3 x 10 (No visible dust
on desk in three days)
Preparation
, H S, NH
2 2 3