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Temperature and humidity
Maintain the temperature and humidity in the equipment room at acceptable levels.
•
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 screws and circuit failure.
•
High temperature can accelerate the aging of insulation materials and significantly lower the
reliability and lifespan of the switch.
To ensure correct operation of the device, the equipment room must meet the temperature and humidity
requirements listed in
Table 1 Temperature/humidity requirements in the equipment room
Temperature
0°C to 40°C (32°F to 104°F)
Cleanliness
Dust buildup on the chassis can 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
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 3 Harmful gas limits in the equipment room
Gas
SO
2
H
S
2
NH
3
Cl
2
NO
2
Table
1.
Relative humidity
5% to 95%, noncondensing
Concentration limit (particles/m
≤ 3 x 10
(No visible dust on desk in three days)
Max. (mg/m
0.2
0.006
0.05
0.01
0.04
4
Table
3.
)
3
2
3
)
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