HPE FlexNetwork 7500 Switch, Руководство по установке

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3
Table 1 Temperature requirements
Temperature Range
Operating temperature 0°C to 45°C (32°F to 113°F)
Storage temperature –40°C to +70°C (–40°F to +158°F)
Humidity
Maintain appropriate humidity in your equipment room, as described in Table 2 .
•
Lasting high relative humidity can cause poor insulation, electricity creepage, mechanical
property change of materials, and metal corrosion.
•
Lasting low relative humidity can cause washer contraction and ESD and bring problems
including loose captive screws and circuit failure.
Table 2 Humidity requirements
Humidity Range
Operating humidity (noncondensing) 5%RH to 95%RH
Storage humidity (noncondensing) 5%RH to 95%RH
Cleanliness
Mechanically active substances 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 Mechanically active substance concentration limit in the equipment room
Substance Particle diameter Concentration limit
Dust particles ≥ 5 µm
≤ 3 x 10
4
particles/m
3
(No visible dust on desk in three days)
Dust (suspension) ≤ 75 µm ≤ 0.2 mg/m
3
Dust
(sedimentation)
75 µm to 150 µm ≤ 1.5 mg/(m
2
h)
Sand ≥ 150 µm ≤ 30 mg/m
3
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 .
Table 4 Harmful gas limits in the equipment room
Gas Maximum concentration (mg/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
NO
2
0.04