H3C Technologies H3C S10500 Series Switches - Manual (Page 13)

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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 cause problems including
loose mounting screws and circuit failure.
Table 2 Humidity requirements
Humidity Range
Operating humidity 10% to 95%, noncondensing
Storage humidity 5% to 95%, noncondensing
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