Humidity; Cleanness - H3C S10504 Installation Manual

Table 1 Temperature requirements
Temperature
Operating temperature
Storage temperature

Humidity

Maintain appropriate humidity in your equipment room, as described in
Lasting high relative humidity tends to cause poor insulation, electricity creepage, mechanical
•
property change of materials, and corrosion of metal parts.
Lasting low relative humidity is likely to result in loose screws due to washer contraction, and even
•
electrostatic discharge (ESD), which causes the circuits to fail.
Table 2 Humidity requirements
Humidity
Operating humidity
Storage humidity

Cleanness

Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of metal
components and contact points. In the worst case, electrostatic adsorption can cause communication
failure.
Table 3 Dust concentration limit in the equipment room
Substance
Dust particles
NOTE:
Dust particle diameter ≥ 5 μm
The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion and
premature aging of components, as shown in
Table 4 Harmful gas limits in an equipment room
Gas
SO
2
H S
2
NH
3
Cl
2
Range
0°C to 45°C (32°F to 113°F)
–40°C to +70°C (–40°F to +158°F)
Range
10% to 95%, noncondensing
5% to 95%, noncondensing
Concentration limit (particles/m
≤ 3 x 10 4
(No visible dust on desk in three days)
Table 4.
Max. (mg/m 3 )
0.2
0.006
0.05
0.01
3
Table 2.
3 )