H3C Technologies H3C MSR 3600 - Manual (Page 10)

2
Examining the installation site
The router can only be used indoors. To make sure the router operates correctly and to prolong its service
lifetime, the installation site must meet the following requirements.
Temperature and humidity
You must maintain temperature and humidity in the equipment room at acceptable levels.
• 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
ESD, which causes the circuits to fail.
• A high temperature is the most undesirable condition, because it accelerates the aging of insulation
materials and significantly lowers reliability and service life of the router.
For the temperature and humidity requirements of the router, see Table 1 .
Table 1 Temperature and humidity requirements
Temperature Humidity
0°C to 45°C (32°F to 113°F) 5% to 90% (noncondensing)
Cleanness
Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of metal
components and contact points, especially when indoor relative humidity is low. In the worst case,
electrostatic adsorption can cause communication failure.
Table 2 Dust concentration limit in the equipment room
Substance Concentration limit (particles/m 3 )
Dust particles
≤ 3 x 10 4
(No visible dust on desk in three days)
NOTE:
Dust particle diameter ≥ 5 μm
The equipment room must also meet limits on salts, acids, and sulfides to eliminate corrosion and
premature aging of components, as shown in Table 3 .
Table 3 Harmful gas limits in the equipment room
Gas Max. (mg/m 3 )
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01