Temperature/Humidity Requirements; Cleanness Requirements - Huawei Quidway S3000-EI Series Installation Manual

Installation Manual
Quidway S3000-EI Series Ethernet Switches

2.2.1 Temperature/Humidity Requirements

To ensure the normal operation and service life of a switch, users need to maintain
the temperature and the humidity of the equipment room at a certain level. If the
humidity level in the equipment room is too high for a long time, it will lead to bad
insulation of the insulating material or even leakage. Sometimes, the mechanical
performance, changes of material, the rustiness and corrosion of some metal parts
are also likely to occur. If the relative humidity is too low, the captive screws may
become loose due to the shrinking of insulation washers. Meanwhile, the electrostatic
is likely to be produced in the dry weather environment, which will jeopardize the
CMOS circuit of the switch. Higher the temperature, the greater will be the damage
caused to the switch. High temperature for a long time will speed up the aging
process of the insulation materials, greatly lower the reliability of the switch and
therefore affect its life span seriously.

2.2.2 Cleanness Requirements

Dust will hazard safe operation of the equipment. 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 relative
indoor humidity is low, which will not only shorten the device's service life, but also
incur communication failures. 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 an equipment room
Mechanical active material
Dust particle
Note: Dust particle Diameter ≥ 5µm
Besides the requirements on dust, rigorous requirements are also set on the air
content of salts, acids, and sulfides in an equipment room. These harmful gases will
accelerate metal corrosion and aging process of certain parts. The equipment room
should be protected from harmful gases such as SO
limits of which are shown in the following Table.
Table 2-2 Value limits on harmful gas contents in an equipment room
SO
2
H S
2
NH
3
Cl
2
Unit
particle/m³
Gas
2-2
Chapter 2 Installation Preparation
Content
≤3 x 104 (No visible dust on desk in three days)
, H S, NH
2 2 3
Max. (mg/m
0.2
0.006
0.05
0.01
and Cl , the value
2
)
3